Patent Publication Number: US-2023160230-A1

Title: Door Strike Plate Sensor

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This U.S. patent application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Application 63/264,514, filed on Nov. 24, 2021. The disclosure of this prior application is considered part of the disclosure of this application and is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     This disclosure relates to a door strike plate sensor. 
     SUMMARY 
     One aspect of the disclosure provides a door position detector including a strike plate mounted onto a door frame. The strike plate includes a back face that opposes the door frame and a front face disposed on an opposite side of the strike plate than the back face and opposing an edge of a door when the door is in a closed position. The door position detector further including a door position sensor integrated with the strike plate, the door position sensor configured to detect a state of the door. 
     Implementations of the disclosure may include one or more of the following optional features. In some implementations, the door position sensor is configured to detect at least one of a door open state, a door closed state, a locked state, or an unlocked state. In other implementations, the door position sensor includes a capacitance sensor, inductance sensor, a proximity sensor, infrared (IR) reflected sensor, hall effect sensor, magnoresistive sensors, radar, light sensor, or temperature sensor. 
     The door position detector may further include a communication interface integrated with the strike plate, the communication interface configured to transmit the state of the door detected by the door position sensor to a remote device. Alternatively, the door positions detector may further include a control circuit integrally formed with the strike plate. 
     In some implementations, the door position detector includes a control circuit disposed on the strike plate or embedded into the strike plate. In these implementations, the control circuit may include a substrate and the door position sensor may be disposed on the substrate. In these implementations, the substrate may include a printed circuit board (PCB). Alternatively in these implementations, data processing hardware may be disposed on the substrate, the data processing hardware including at least one of an integrated circuit, a digital signal processor (DSP) chip, or a system on a chip (SoC). In these implementations, the substrate may define a planar face that is substantially parallel with planar surfaces defined by the front and back faces of the strike plate. Further, in these implementations, the substrate may be inserted into a mortise hole and may define a substantially cylindrical or rounded shape, the substrate may define a longitudinal axis that aligns with a longitudinal axis of the mortise hole. In these implementations, a mortise housing may be inserted into the mortise hole and enclosing the substrate. 
     The door position detector may further include an energy storage device configured to power components of the door position detector. In some implementations, the strike plate includes a lip portion that protrudes from the front and back faces of the strike plate, the lip portion including a strike surface and a non-strike surface disposed on an opposite side of the lip portion than the strike surface, the strike surface configured to initiate contact with a strike latch of the door when the door is transitioning into the closed position. In these implementations, the door position detector may further include a control circuit embedded into the lip portion of the strike plate or disposed on the non-strike surface of the lip portion of the strike plate. In these implementations, the back face of the strike plate may be in direct contact with the door frame. Alternatively in these implementations, the control circuit may include a substrate and the door position sensor may be disposed on the substrate. In these implementations, the substrate may define a surface area that is less than or equal to a surface area defined by the non-strike surface of the lip portion of the strike plate. Alternatively in these implementations, the substrate may include a printed circuit board (PCB). In these implementations, data processing hardware may be disposed on the substrate, the data processing hardware including at least one of an integrated circuit, a digital signal processor (DSP) chip, or a system on a chip (SoC). In these implementations, the substrate may define a contour that follows a contour of the non-strike surface of the lip portion of the strike plate. In these implementations, the lip portion of the strike plate may be angled relative to planar surfaces defined by the front and back faces of the strike plate. 
     In some implementations, the door position detector further includes one or more additional door position sensors integrated with the strike plate, each of the one or more additional door position sensors configured to detect the state of the door. In these implementations, the one or more additional door position sensors may include at least one of the strike plate or a face plate mounted onto the edge of the door. 
     Another aspect of the disclosure provides for a door position detector including a face plate mounted onto an edge of a door. The face plate including a back face that opposes the edge of the door and a front face disposed on an opposite side of the back face and opposing a door frame when the door is in a closed position. The door position detector further includes a door position sensor integrated with the face plate, the door position sensor configured to detect a state of the door. 
     This aspect may include one or more of the following optional features. The door position sensor may be configured to detect at least one of a door open state, a door closed state, a locked state, or an unlocked state. The door position sensor may include a capacitance sensor, inductance sensor, a proximity sensor, infrared (IR) reflected sensor, hall effect sensor, magnoresistive sensors, radar, light sensor, or temperature sensor. In some implementations, the door position detector includes a communication interface integrated with the face plate, the communication interface configured to transmit the state of the door detected by the door position sensor to a remote device. 
     The door position detector may further include a control circuit integrally formed with the face plate. The door position may further include an energy storage device configured to power components of the door position detector. 
     In some implementations, the door position detector includes a control circuit disposed on the face plate or embedded into the face plate. In these implementations, the control circuit may include a substrate and the door position sensor may be disposed on the substrate. In these implementations, the substrate may include a printed circuit board (PCB). Alternatively in these implementations, the door position detector may include data processing hardware disposed on the substrate, the data processing hardware including at least one of an integrated circuit, a digital signal processor (DSP) chip, or a system on a chip (SoC). In these implementations, the substrate may define a planar face that is substantially parallel with planar surfaces defined by the front and back faces of the face plate. 
     The details of one or more implementations of the disclosure are set forth in the accompanying drawings and the description below. Other aspects, features, and advantages will be apparent from the description and drawings, and from the claims. 
     BACKGROUND 
     The security industry has the need for a door sensor that is easily installed and is not visible to the homeowner or a thief. Currently, the options for securing a door are to either use a sensor mounted to the door with a corresponding magnet mounted to the door frame or install a ‘recessed sensor’ that is mounted into the door and a magnet mounted into the door frame. The externally mounted sensor is relatively easy to install but has some disadvantages. First, the sensor and magnet are visible and detract from the aesthetics of the home. Secondly, it is sometimes hard to align the magnet with the door sensor, since the magnet or sensor must be mounted onto the trim as well as the door. The recessed sensor was designed to be a completely invisible install. The problem is that mounting the sensor and magnet is not an easy task. The door must be drilled with a large diameter bit to allow the sensor to be inserted into the door. Then, the door frame must be drilled to allow for a magnet to be inserted. In addition, the sensor is placed at the top edge of the door which requires a person to scale a three to six foot ladder in order to replace the sensor&#39;s internal battery. This can pose a major concern for older homeowners, or homeowners with physical disabilities 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIGS.  1 A and  1 B  are schematic views of an example door position sensor including a strike plate, a control circuit, and a door sensor disposed on the control circuit. 
         FIGS.  2 A and  2 B  are schematic views of an example door position sensor including a stike plate defining a mortise housing, a control circuit disposed in the mortise housing, and a door sensor disposed on the control circuit. 
         FIG.  3    is a schematic view of a door position detector including a strike plate mounted onto a door frame  301 . 
         FIG.  4    is a schematic view of a door position detector in communication with a remote device to communicate a status of a door. 
         FIG.  5    is a schematic view of an example door position detector including a door lock assembly and a face plate. 
         FIG.  6    is a schematic view of an example door position detector including a strike plate and a door position sensor mounted onto a door frame via mounting arms. 
         FIG.  7    is a schematic view of an example door position detector communicating a state of a door when a strike latch enters a mortise hole formed through a door jamb. 
         FIG.  8    is a schematic view of an example computing device that may be used to implement the systems and methods described herein. 
     
    
    
     Like reference symbols in the various drawings indicate like elements. 
     DETAILED DESCRIPTION 
     Conventional door sensors are installed by either mounting the door sensor onto the door or by mounting the door sensor into a recessed hole that must be drilled into the door as part of the install process. These conventional door sensors are typically positioned at a top edge of the door requiring a user to use a ladder in order to access the sensor for maintenance, such as replacing an internal battery powering the sensor. Implementations herein are directed toward a door position sensor integrated with a strike plate (or door face plate) that is easily-accessible from the ground-level for maintenance and installation, that is invisible from view, and that that does not require any drilling, or otherwise altering, of an existing door (or door frame) when installing the strike plate integrated with the door position sensor. 
     All doors are mounted using a strike plate. The present disclosure leverages the strike plate to form a door position detector that integrates a door position sensor with the strike plate. Simply removing two screws allows the existing strike plate to be removed and replaced with the door position detector that integrates the door position sensor with the strike plate. In some implementations, the door sensor is integrated with a door handle assembly disposed on the door or in the latch bolt bore instead of the strike plate disposed on the door jamb. In other implementations, the door position sensor is integrated with a door face plate that mounts onto an edge of the door. 
       FIGS.  1 A- 7    illustrate example door position detectors  10 ,  10   a - g  integrated into at least one of a strike plate assembly, an existing mortise hole, a door handle assembly, or in a latch bolt bore. Each door position detector  10  may include at least one door position sensor configured to detect whether a door is in an open state or a closed state. As used herein, the door position sensor may be interchangeably referred to as a ‘door sensor’. Additionally or alternatively, the door sensors may be configured to detect whether the door is in a locked state or an unlooked state. The door sensor may also be configured to detect when an object, such as a person, passes by the door and through the door opening. There are many techniques for using door sensors to determine the position of the door. These techniques include, but are not limited to, capacitance sensing, inductance proximity, infrared (IR) reflected sensors, hall effect sensors, magnoresistive, radar, proximity, light, temperature, etc. In capacitance sensing, components of the door position detector create different capacitance values for different states of the door. For instance, a first capacitance value may be associated with a closed door state and a second capacitance value may be associated with an open door state. Moreover, different capacitance values may indicate more granular position information such as whether the door is cracked slightly open, is fully open, or some position between slightly open and fully open. Similarly, different capacitance values may indicate whether the door is locked or unlocked, i.e., whether or door lock (e.g., bolt) is engaged to lock the door closed or disengaged so that the door is unlocked in the closed position. In these examples, the capacitance value may change when a deadbolt transitions between engaged and disengaged states. Capacitance sensed by a capacitance sensor may also change in response to gestures. Inductance values via inductance sensing may be similarly applied as the aforementioned capacitance values to ascertain different states of the door. 
     In some implementations, the door position detector includes a microphone configured to capture acoustic sounds in the environment of the door position detector. In these implementations, the door position detector may include a sound detection unit that is configured to detect whether acoustic sounds captured by the microphone are indicative of at least one of a door closing event, a door opening event, a door locking event, or a door unlocking event. Additionally or alternatively, the door position detector may provide voice recognition and/or speech recognition capabilities. For instance, a speech recognition unit may be able to recognize voice commands in speech audio captured by the microphone. Here, the speech recognition unit may perform speech recognition on the captured speech audio to determine whether a command to open, lock, or unlock the door. The command could also include a password to open, lock, or unlock the door. The speech recognition unit may include a speech recognition model/system executing on data processing hardware integrated into the door position sensor. The speech recognition model may be trained to recognize a set of predefined command phrases. Additionally, the speech recognition model may be trained to only detect key words/phrases indicative of command(s) to open, lock, or unlock the door. 
     The door position detector may include a voice recognition unit configured to detect whether speech audio captured by the microphone was spoken by an authorized person. For instance, one or more voice profiles (reference speaker embeddings) each associated with a respective may be stored on memory hardware of the door position detector (or on memory hardware of a remote device in communication with the door position sensor) and compared with a speaker embedding extracted by the voice recognition unit from the captured speech audio. When the speaker embedding extracted from the speech audio matches one of the voice profiles (reference speaker embeddings), the speaker of the speech audio may be deemed an authorized user, i.e., an individual authorized to at least one of open, close, lock, or unlock the door. The voice recognition unit may execute on data processing hardware of the door position detector. The data processing hardware of the door position detector  10  of  FIGS.  1 A- 8    may be implemented on a printed circuit board (PCB)  103 ,  203  and include a system on a chip (SoC) processor or a digital signal processor (DSP) chip. As used herein, a PCB may include a flexible PCB (i.e., flex board) or a rigid PCB. The data processing hardware of the door position detector  10  may include other types of processors/computing chips. 
     The door position detector  10  may also include a communication interface (e.g., an RF/Bluetooth/NFC transmitter) for communicating the position/state of the door measured by the door sensor to a remote device, such as a security panel. The communication interface a receiver/transceiver capable of receiving communications from remote devices. The communication interface could also receive verification signals from a user computing device (e.g., smart phone or tablet) or an electronic key for permitting authorized users to open and/or lock/unlock the door. For instance, RF/NFC technology may communicate verification signals from the user computing device or electronic key that may be detected by the door position detector when the user computing device or electronic key is within a proximity range of the door position sensor  10 . Similarly, tracking devices integrated in fall detection devices or other devices worn or carried by users could communicate location information to the door position detector when a user is proximity. The door position detector could function as a geo-fence to inform a remote device when a user has passed through the door. For instance, the door position detector could transmit a time stamp and notification to a security panel or PERS system to alert loved ones or monitoring personnel of the event. 
     The door position detector may further include an energy storage device (e.g., a battery) for power one or more components of the door position detector (e.g., the sensor, transmitter/receiver, data processing hardware, etc.). A battery housing may be integrated into the design of the door position detector. In some implementations, some or all of the components of the door position detector are integrated into a mortise hole/housing juxtaposed with the strike plate. This would permit the use of larger batteries to be used for powering components of the door position detector. Optionally, the door position detector  10  may include circuitry for using an external energy storage device to wirelessly charge the battery of the door position sensor. In such a scenario, the external energy storage device may be an existing energy storage device integrated into the door handle assembly for powering electrical components of the door handle assembly (e.g., an electronic keypad) and the door position detector  10  may be integrated with the strike plate and/or mortise hole. The wireless charging circuitry (e.g., conductive charging coils) may pass charging currents wirelessly from the external energy storage device to charge the battery of the door position detector. 
       FIGS.  1 A and  1 B  show the door position detector  10 ,  10   a  including a strike plate  100  that defines a bore hole  101  to permit passage of a lock bolt or strike latch  702  ( FIG.  7   ) of a cooperating door handle assembly. The bore hole  101  aligns with a mortise hole  311  ( FIG.  3   ) of a door frame/jamb  301  ( FIG.  3   ) when the strike plate  100  is mounted onto the door frame/jamb. The strike plate  100  may be formed form metal or other suitable material. The strike plate  100  includes a back face  112  ( FIG.  2 B ) and a front face  110  disposed on an opposite side of the strike plate  100  than the back face  112 . The front face  110  defines a planar surface that opposes and is substantially parallel to an edge of the door when the door is in the closed position. The strike plate  100  may further define one or more mounting holes  102  configured to receive fastening members (e.g., screws) for mounting the strike plate  100  to the door frame/jamb. 
     The door position detector  10  further includes a control circuit  103  disposed on the strike plate  100 . In the examples shown, the control circuit  103  includes a substrate (e.g., a printed circuit board (PCB) assembly) that opposes the back face  112  of the strike plate  100 . The PCB assembly may be flexible (e.g., flex board) or substantially rigid. While the example shown depicts the substrate  103  disposed on the back face  112  of the strike plate  100  to implement the control circuit  103 , other configurations may include the control circuit  103  integrally formed with the strike plate  100 . In some examples, the control circuit  103  is embedded into the strike plate  100  between the front face  110  and the back face  112 . For instance, the control circuit  103  including the substrate may be embedded into the strike plate  100  and not visible when viewing the exposed front and back faces  110 ,  112 . In these examples, the strike plate  100  may be formed from one or more separate pieces that attach to enclose the substrate  103 . The substrate  103  includes at least one of control circuitry  104 , a communication interface (e.g. a RF transmitter/receiver/transceiver)  105 , one or more door position sensors  106 , and an energy storage device (e.g., battery)  107  for powering components of the door position detector  10 . In some examples, the substrate  103  includes the same or smaller dimensions as the strike plate  100  so that the substrate  103  and components disposed thereon are concealed by the strike plate  101  when the strike plate  100  is mounted onto the door frame/jamb. In some examples, the substrate  103  defines one or more corresponding mounting holes that align with the mounting holes  102  defined by the substrate  103 . 
       FIG.  1 A  shows the strike plate  100  of the door position detector  10   a  including a lip portion  10  that protrudes from the front and back faces  110 ,  112  of the strike plate  100 . Here, the lip portion  10  includes a strike surface and a non-strike surface disposed on an opposite side of the lip portion than the strike surface. The strike surface is configured to initiate contact with a strike latch  702  ( FIG.  7   ) of the cooperating door handle assembly. While the edge of the door and the door frame may obstruct the view of the front and back faces of the strike plate  100  when the door is in the closed position, the lip portion  10  may be exposed from the edge of the door and the door frame when the door is in the closed position. In some configurations, the strike and non-strike surfaces of the lip portion  10  are angled relative to planar surfaces defined by the front and back faces of the strike plate to facilitate engagement with a cooperating angled surface of the strike latch. 
     In some implementations, the control circuit  103  is disposed on the non-strike surface of the lip portion  10  of the strike plate  100  or embedded into the lip portion  10 . 
     As such, the back face  112  ( FIG.  2 B ) of the strike plate  100  may be in direct contact with the door frame while the control circuit  103  is only disposed on the non-strike surface of the lip portion of the strike plate  100  or embedded into the lip portion  10 . While not shown, the control circuit  103  disposed on the non-strike surface of the lip portion  10  or embedded into the lip portion  10  may include the substrate with the door position sensor  106  and other components  104 ,  105 ,  107  disposed on the substrate  103 . Accordingly, in these implementations, the substrate  103  (e.g., a PCB) may define a surface area that is less than or equal to a surface area defined by the non-strike surface of the lip portion  10  of the strike plate  100 . As such, the substrate  103  may define a contour that follows a contour of the non-strike surface of the lip portion  10 . The strike and non-strike surfaces of the lip portion define planar or curved contours. Referring to  FIG.  2 A and  2 B , in some implementations, the door position detector  10 ,  10   b  further includes a mortise housing  201  attached to the strike plate  100  and configured to extend into a mortise hole  511  ( FIG.  5   ) when the strike plate  200  is mounted onto the door frame/jamb. In the example shown, the housing  201  defines an enclosure that may house the energy storage device (e.g., battery)  107  and the substrate  103 . The housing  201  may include a flange or tab for mounting within the mortise hole. The housing  201  could mount to the mortise hole via a compression fit. Here, the substrate  103  may define a cylindrical-shaped or curved profile along an inner wall of the housing  201  that defines the enclosure. In some examples, the housing  201  is formed from the substrate  103 . Notably, the enclosure may accommodate larger sized batteries. A portion of the substrate  103  may also be substantially flush with the back face of the strike plate  100  as shown in  FIGS.  1 A and  1 B . Here, the door position sensor  106  and/or the communication interface  105  may be disposed on the portion of the substrate  103  that is flush with the strike plate  100  and the battery  107  may be disposed on the portion of the substrate  103  housed by the housing  201 . In this configuration, the portion of the substrate  103  housed by the housing  201  may define a longitudinal axis that aligns with a longitudinal axis of the mortise hole and the portion of the substrate  103  that is flush with the strike plate  100  may define a longitudinal axis that is substantially parallel to planar surfaces of the strike plate  100  and perpendicular to the longitudinal axis of the portion of the substrate  103  housed by the housing  201 . 
       FIG.  3    shows the door position detector  10 ,  10   c  mounted onto the door jamb  301  via fasteners  401  that extend through corresponding mounting holes  102  defined by the strike plate  100 . In configurations where the door position detector  10   c  includes a substrate  103 , the substrate  103  may define corresponding mounting holes that align with the mounting holes  102  defined by the strike plate  100 . The bore hole  101  defined by the strike plate  300  aligns with the mortise hole  311  in the door jamb  301  and permits passage of the lock bolt or strike latch  702  ( FIG.  7   ) into the mortise hole  311 . 
       FIG.  4    the door position detector  10 ,  10   d  including the strike plate  100  defining the one or more mounting holes  102  configured to receive the fasteners (e.g., mounting screws)  401  for mounting the door position detector  10   d  onto the door jamb. Upon initial installation, when the mounting screws  401  pass through the strike plate  100  and are secured to make contact with the strike plate  100 , the strike plate  100  may activate to perform a signal calibration for the door position detector  10   d.  Additionally or alternatively, the door position detector  10  may include a calibration button that a user may touch/press to perform signal calibration. Once calibrated, the strike plate  100  maintains a known signal range indicating when the door is either opened or closed. When a door is opened or closed, the sensor  106  transmits that status (i.e., a state of the door indicating opened or closed) to a remote device  402  to indicate the status/state of the door at any time. The remote device  402  may include a security panel or other signal receiver. In addition, the mounting screws  401  may also serve as a tamper switch that triggers an alert to the security panel  402  or other device when the screws  401  are removed. 
     Referring to  FIG.  5   , in some implementations, the door position detector  10 ,  10   e  is integrated as part of a door lock assembly  500  attached to an edge  510  of a door  501 . In these implementations, the door position detector  10   e  includes a door face plate assembly  502  instead of the strike plate. Here, a substrate including the control circuitry, door position sensor, communication interface, battery and/or other components may be affixed to the door face plate assembly  502  that mounts onto the edge  510  of the door  501 , rather than affixed to the strike plate  100  that mounts onto the door frame  301  as shown by the door position detector  10   c  of  FIG.  3   . Similarly, the substrate including the control circuitry could be integrally formed with the strike plate and/or embedded into the face plate assembly  502 . 
       FIG.  6    shows an example technique for tamper sensing of a door position detector  10 ,  10   f  that includes the strike plate  100 , a door position sensor  106  having a pair of mounting arms  602 , and fasteners (e.g., mounting screws)  401  for mounting the strike plate  100  onto a door frame/jamb  301 . In this example, the door position sensor  106  and battery (not shown) is inserted into the mortise hole  311  while the mounting arms  602  are substantially parallel with the back face of the strike plate  100 . The mounting screws  401  pass through the mounting holes  102  of the strike plate  600  as well as the mounting arms  602  of the door position sensor  601  and secure to the door jamb  311  to mount the strike plate  100  such that the bore hole  101  is aligned with the mortise hole  311 . Here, the strike plate  100 , mounting screws  401 , and mounting arms  602  may create a conductive circuit. Tampering may be sensed when the mounting screws  401  are removed to cause the conductive circuit to short. 
     Referring to  FIG.  7   , the door position detector  10 ,  10   g  includes the door position sensor  106  and the battery  107  disposed within the mortise hole  311  or a mortise hole housing  201  that extends into the mortise hole as described above with reference to the door position detector  10   b  of  FIGS.  2 A and  2 B . The detector  10   g  may include the substrate  103  disposed within the housing  201  that includes the sensor  106 , battery  107 , and any of the other components described throughout the present disclosure. Here, the strike plate  100 , when mounted onto the door jamb may cause surfaces of the sensor  106  and the strike plate  100  to create an electrical circuit when contacting one another. When a cooperating door lock bolt or strike latch  702  enters the mortise hole to close a door, the sensor  106  may create a wireless signal connection indicating a door closed state that may be communicated via the communication interface  105  to a remote device  402 . Notably, the strike plate  100  and/or strike latch  702  may operate as additional door position sensors that cooperate with the door position sensor  106  to determine the state of the door. The remote device could include a monitoring device (e.g., security panel) for a security system. 
     Implementations of the present disclosure provide techniques for detecting/sensing a position/state of a household door, office door, etc. designed into the strike plate or lock assembly to provide a door position detector allowing for a wireless communication signal to be transmitted from the door position detector to an alarm monitoring panel. The door position detector and associated one or more door position sensors may be adapted to transmit a vast array of information such as door status (open/closed, locked/unlocked), alarm status (armed/disarmed), etc. The door position sensors may use a wide arrange of technologies such as, without limitation, capacitive, inductive, radar, RF, magnetic, proximity, light, temperature or any other sensing method known now or in the future. The door position sensor may communicate via a communicate interface that uses any known or future wireless communication standard such as, without limitation, Wi-Fi, cellular, RF, Sub-Gig, millimeter-Wave, Bluetooth, BLE, Z-Wave, and Zigbee to name just a few. 
     The door position detector  10 ,  10   a - g  described herein may be employed in residential homes as part of a home intrusion alarm system. Here, the door position detector  10  may communicate the state of the door to the alarm system, thereby causing the alarm system to trigger a home intrusion alarm when the door is transitioned into an open state during a time when the alarm is armed. Similarly, the door position detector  10  in the residential setting could be used as an internet of things (IOT) device in a network of IOT devices. For instances, a user could have a phone app and could continuously monitor the state of the door by checking whether the door is locked or unlocked and could issue commands to lock or unlock the door as needed. 
     Mounting screws or other types of fasteners used to mount the door position detector on the door frame/jamb (i.e., when door position detector includes a strike plate) or on the door edge (i.e., when the door position detector includes a face plate) may also function as a tamper switch. Here, when the screws are fastened to the jamb or door edge and in contact with the strike plate or face plate, an electrical circuit is created. When the screws are loosened removed the electrical circuit shorts and triggers a tamper alert that is communicated to a remote unit, such as an alarm panel and/or a user device. Similarly, upon mounting the door position detector via fasteners (e.g. mounting screws), the door position sensor may trigger a calibration routine where the door position sensor calibrates its position, alignment, capacitance, inductance, etc., and stores these values on memory hardware, e.g., an integrated circuit of the door position detector. The door position detector could have a dedicated calibration button that can be activated once the detector is installed and ready to be calibrated. 
     In some implementations, the door position detector is configured to recognize time intervals between door opening and closing events and transmit a notification to a remote device when the door is left in an open state for a length of time that exceeds a time threshold. 
     In some implementations, components such as the battery and door position sensor are located within a housing that is recessed into the mortise located directly behind the mounted strike plate on the doorframe. When a door lock is installed, the lock bolt would travel through the strike plate and enter the sensor housing located in the bore hole. The housing could be made from a varying range of materials such as, but not limited to plastic, metal, rubber, or any other material available today or in the future. 
     In additional implementations, the door position detector is used in conjunction with other devices such as, without limitation, panic buttons, help buttons, fall sensors and other similar wireless devices used to address sudden emergencies in the service known as the Personal Emergency Response System (PERS) industry. When a device worn or carried by a user passes by the sensor it could provide tracking information similar to a geo-fencing model. A time stamp and notification could be sent to the security panel or PERS system to alert loved ones or monitoring personnel of the event. 
     In some examples, the door position sensor may measure capacitance values when a door knob/handle/lever of the door is touched. When the capacitance value satisfies certain thresholds, the door position sensor could interact with a wide range of devices such as, without limitation, internal or external lights, audio alerts/sirens, or other devices as part of an IOT network. The door position detector could further fetch an identifier of the user from his/her smart phone responsive to a capacitive change indicative of the user touching the door knob/handle/lever. Here, the door position detector can use the identifier to verify whether or not the user is authorized to access the door. When the user is verified as an authorized user, the door position detector or other device could automatically unlock the door. Conversely, when the user is not verified, the door may remain locked requiring the user to provide additional verification means, e.g., entering code on a keypad or inserting a physical key to unlock the door 
     A door position sensor or other sensor integrated into the door position detector could obtain biometric/biomedical information from a user. For instance, biometric information could be obtained from a user under duress that touches a cooperating door knob/handle/lever, thereby causing the door position sensor to alert first responders or caregivers of the user&#39;s biometric/biomedical status. 
     In some examples, the door position sensor is configured to detect passage through an open door. Here, the door position sensor may be installed on a strike plate or within a mortise hole. The door position sensor may include a light detector, heat/infrared detector, radar, or any other type of sensor capable of detecting events indicative of an object passing through an open door. This sensor may activate only when the sensor or another door position sensor determines that the door is in an open state. 
     In additional implementations, door hardware such as hinge pins may include sensors (e.g., strain gauge, rotational position sensor, etc.) that measure information that indicates a current door state (open/closed, locked/unlocked). The door hardware may communicate the measured information to the door position detector installed on the doorframe or the door faceplate. Temperature sensors could also be installed on various hardware components and communicated with the door position detector to detect events such as fires. The door position detector may also integrate a temperature sensor on the substrate without departing from the scope of the present disclosure. 
     The wireless door position sensor described herein may further be inserted into the mortise hole of a door lock assembly, while the strike plate would be mounted on the door jamb over the mortise hole using mounting screws so that when the strike plate contacts the sensor it creates a conductive contact that transmits a status signal to a remote device. Similarly, the door position detector will transmit a status signal indicating when conductive contact is broken. Additionally or alternatively, surfaces of the strike plate when mounted via mounting screws may create an electrical contact circuit that may be leveraged as a tamper switch such that removing any of the screws will break the electrical circuit. Timestamped notifications may be sent to a remote device each time the electrical circuit is established and/or broken. 
     In configurations where the door position sensor is disposed within the mortise hole or behind the strike plate, a lock bolt or strike latch entering the mortise hole during a door closing event may create an electronic connection with an existing circuit between strike plate and door position sensor. Each time this electronic connection is established (e.g., door closing event) or removed (e.g., door opening event), a timestamped notification may be transmitted to a remote device. 
     A software application (i.e., a software resource) may refer to computer software that causes a computing device to perform a task. In some examples, a software application may be referred to as an “application,” an “app,” or a “program.” Example applications include, but are not limited to, system diagnostic applications, system management applications, system maintenance applications, word processing applications, spreadsheet applications, messaging applications, media streaming applications, social networking applications, and gaming applications. 
     The non-transitory memory may be physical devices used to store programs (e.g., sequences of instructions) or data (e.g., program state information) on a temporary or permanent basis for use by a computing device. The non-transitory memory may be volatile and/or non-volatile addressable semiconductor memory. Examples of non-volatile memory include, but are not limited to, flash memory and read-only memory (ROM)/programmable read-only memory (PROM)/erasable programmable read-only memory (EPROM)/electronically erasable programmable read-only memory (EEPROM) (e.g., typically used for firmware, such as boot programs). Examples of volatile memory include, but are not limited to, random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), phase change memory (PCM) as well as disks or tapes. 
       FIG.  8    is schematic view of an example computing device  800  that may be used to implement the systems and methods described in this document. The computing device  800  is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The computing device  800  may represent the door position detector  10  of  FIGS.  1 - 7   . The components shown here, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed in this document. 
     The computing device  800  includes a processor (e.g., data processing hardware)  810 , memory (e.g., memory hardware)  820 , a storage device (e.g., memory hardware)  830 , a high-speed interface/controller  840  connecting to the memory  820  and high-speed expansion ports  850 , and a low speed interface/controller  860  connecting to a low speed bus  870  and a storage device  830 . Each of the components  810 ,  820 ,  830 ,  840 ,  850 , and  860 , are interconnected using various busses, and may be mounted on a common motherboard or in other manners as appropriate. The processor  810  can process instructions for execution within the computing device  800 , including instructions stored in the memory  820  or on the storage device  830  to display graphical information for a graphical user interface (GUI) on an external input/output device, such as display  880  coupled to high speed interface  840 . In other implementations, multiple processors and/or multiple buses may be used, as appropriate, along with multiple memories and types of memory. Also, multiple computing devices  800  may be connected, with each device providing portions of the necessary operations (e.g., as a server bank, a group of blade servers, or a multi-processor system). 
     The memory  820  stores information non-transitorily within the computing device  800 . The memory  820  may be an integrated circuit, computer-readable medium, a volatile memory unit(s), or non-volatile memory unit(s). The non-transitory memory  820  may be physical devices used to store programs (e.g., sequences of instructions) or data (e.g., program state information) on a temporary or permanent basis for use by the computing device  800 . Examples of non-volatile memory include, but are not limited to, flash memory and read-only memory (ROM)/programmable read-only memory (PROM)/erasable programmable read-only memory (EPROM)/electronically erasable programmable read-only memory (EEPROM) (e.g., typically used for firmware, such as boot programs). Examples of volatile memory include, but are not limited to, random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), phase change memory (PCM) as well as disks or tapes. 
     The storage device  830  is capable of providing mass storage for the computing device  800 . In some implementations, the storage device  830  is a computer-readable medium. In various different implementations, the storage device  830  may be a floppy disk device, a hard disk device, an optical disk device, or a tape device, a flash memory or other similar solid state memory device, or an array of devices, including devices in a storage area network or other configurations. In additional implementations, a computer program product is tangibly embodied in an information carrier. The computer program product contains instructions that, when executed, perform one or more methods, such as those described above. The information carrier is a computer- or machine-readable medium, such as the memory  820 , the storage device  830 , or memory on processor  810 . 
     The high speed controller  840  manages bandwidth-intensive operations for the computing device  800 , while the low speed controller  860  manages lower bandwidth-intensive operations. Such allocation of duties is exemplary only. In some implementations, the high-speed controller  840  is coupled to the memory  820 , the display  880  (e.g., through a graphics processor or accelerator), and to the high-speed expansion ports  850 , which may accept various expansion cards (not shown). In some implementations, the low-speed controller  860  is coupled to the storage device  830  and a low-speed expansion port  890 . The low-speed expansion port  890 , which may include various communication ports (e.g., USB, Bluetooth, Ethernet, wireless Ethernet), may be coupled to one or more input/output devices, such as a keyboard, a pointing device, a scanner, or a networking device such as a switch or router, e.g., through a network adapter. 
     The computing device  800  may be implemented in a number of different forms, as shown in the figure. For example, it may be implemented as a standard server  800   a  or multiple times in a group of such servers  800   a,  as a laptop computer  800   b,  or as part of a rack server system  800   c.    
     Various implementations of the systems and techniques described herein can be realized in digital electronic and/or optical circuitry, integrated circuitry, specially designed ASICs (application specific integrated circuits), computer hardware, firmware, software, and/or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device. 
     These computer programs (also known as programs, software, software applications or code) include machine instructions for a programmable processor, and can be implemented in a high-level procedural and/or object-oriented programming language, and/or in assembly/machine language. As used herein, the terms “machine-readable medium” and “computer-readable medium” refer to any computer program product, non-transitory computer readable medium, apparatus and/or device (e.g., magnetic discs, optical disks, memory, Programmable Logic Devices (PLDs)) used to provide machine instructions and/or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term “machine-readable signal” refers to any signal used to provide machine instructions and/or data to a programmable processor. 
     The processes and logic flows described in this specification can be performed by one or more programmable processors, also referred to as data processing hardware, executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows can also be performed by special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit). Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read only memory or a random access memory or both. The essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks. However, a computer need not have such devices. Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD-ROM disks. The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry. 
     To provide for interaction with a user, one or more aspects of the disclosure can be implemented on a computer having a display device, e.g., a CRT (cathode ray tube), LCD (liquid crystal display) monitor, or touch screen for displaying information to the user and optionally a keyboard and a pointing device, e.g., a mouse or a trackball, by which the user can provide input to the computer. Other kinds of devices can be used to provide interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback, e.g., visual feedback, auditory feedback, or tactile feedback; and input from the user can be received in any form, including acoustic, speech, or tactile input. In addition, a computer can interact with a user by sending documents to and receiving documents from a device that is used by the user; for example, by sending web pages to a web browser on a user&#39;s client device in response to requests received from the web browser. 
     A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the disclosure. Accordingly, other implementations are within the scope of the following claims.