# Patent

## Title
Intelligent strike indicator

## Abstract

A strike indicator that indicates when a fish bites and reduces false positives, comprising a light source, a power source, a printed circuit board, an accelerometer integrated circuit mounted on said printed circuit board, and a microcontroller mounted on said printed circuit board. The strike indicator may be housed in a fishing rod, with the light source illuminating the tip of the rod. The accelerometer detects acceleration of the rod, and the microcontroller utilizes an algorithm to determine whether the acceleration is due to a fish biting or due to other causes. If the acceleration is due to a fish biting, the light source is activated, alerting the user that a fish is biting.

## Background
REFERENCE TO PENDING APPLICATIONS
This application is not based upon any pending domestic or international patent applications.
REFERENCE TO MICROFICHE APPENDIX
This application is not referenced in any microfiche appendix.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to fishing equipment. More specifically, the present invention relates to devices that indicate when a fish bites.
2. Prior Art
Fishing at night is difficult because the angler cannot see the tip of the fishing pole to determine when a fish is biting. Therefore, there have been many devices created that indicate when a fish bites. These devices usually detect tension in the fishing line or motion of the fishing pole, or may contain a circuit that closes when the fishing pole is flexed. When a triggering event occurs, the device produces a light or a sound to alert the user that a fish is biting. However, these devices do not differentiate between a fish biting and other causes of line tension or pole motion, such as snags, wind, and waves, other than simple threshold detection. Additionally, these devices do nothing to show that a strike occurred in the past. Furthermore, the type of device that detects line tension may interfere with the function of the fishing line.
Based on the foregoing, there is a need for an intelligent strike indicator that does not impede the function of the fishing line and that filters out false positives so that it signals the user only when a fish bites.
BRIEF SUMMARY OF THE INVENTION
In general, in a first aspect, the invention features a strike indicator for indicating when a fish bites, comprising a fishing rod, a light source, a power source, a printed circuit board, an accelerometer integrated circuit mounted on the printed circuit board, and a microcontroller mounted on the printed circuit board. Capacitors may also be mounted on the printed circuit board. The light source may be a light emitting diode, and the power source may be two 1.5 volt batteries. The strike indicator may also comprise a radio transmitter and a remote handheld device that receives and analyzes transmissions from the transmitter.
The strike indicator may be housed internally within the fishing rod, which may have a transparent or translucent rod tip. The rod tip may be designed to maximize light output from an internal source. The power source may be housed within the fishing rod. The strike indicator may also be capable of being installed externally on the fishing rod. The strike indicator may be located within an external housing mounted on the tip of the fishing rod. The external housing may comprise a transparent or translucent portion such that the light source within the external housing may be seen when illuminated. Additionally, the strike indicator may be housed in a fishing bobber.
The strike indicator filters out false positives. A method of indicating when a fish bites includes the steps of using a fishing rod with the strike indicator, detecting acceleration on the rod, beginning an algorithm to determine whether the acceleration is due to a fish biting, where the algorithm filters out false positives, and activating the light source if the microcontroller determines that a fish is biting. The algorithm comprises the following steps: (1) determining whether a strike occurred state is set to true, where the strike occurred state set to true indicates that a strike previously occurred and the strike occurred state was set to true pursuant to this algorithm; (2) if the strike occurred state is set to true, activating the light source with a flash rate that indicates how much time has passed since the strike occurred; (3) regardless of whether the strike occurred state is set to true or false, determining whether a change in acceleration has occurred; (4) if a change in acceleration has not occurred, entering a timed sleep mode; (5) if a change in acceleration has occurred, taking multiple samples of accelerations and adding them to a buffer and proceeding to determine whether a certain percentage of accelerations in the buffer is large enough to indicate a cast; (6) if a certain percentage of accelerations in the buffer is large enough to indicate a cast, deactivating the light source, ignoring future accelerations for a certain length of time, setting the strike occurred state to false, and entering a timed sleep mode; (7) if a certain percentage of accelerations in the buffer is not large enough to indicate a cast, determining whether the angle of the fishing rod has changed by calculating the angle of gravity; (8) if the angle of the fishing rod has changed, setting the strike occurred state to true and entering a timed sleep mode; (9) if the angle of the fishing rod has not changed, determining whether the acceleration is non-decaying and periodic; (10) if the acceleration is non-decaying and periodic, entering a timed sleep mode; and (11) if the acceleration is not periodic or is periodic and decaying, setting the strike occurred state to true and entering a timed sleep mode.
A better understanding of the invention will be obtained from the following detailed description of the preferred embodiment taken in conjunction with the drawings and the attached claims.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cut away view of a fishing rod with an intelligent strike indicator housed therein;
FIG. 2 is an exterior view of an intelligent strike indicator housed in an external unit that may be mounted to a fishing rod;
FIG. 3 is a cut away view of the intelligent strike indicator of FIG. 3;
FIG. 4 is a cross section of the intelligent strike indicator of FIG. 4;
FIG. 5 is a cut away view of a bobber float with an intelligent strike indicator housed therein;
FIG. 6 is a circuit diagram illustrating the circuitry of an intelligent strike indicator;
FIG. 7 is a flow chart illustrating the method by which the intelligent strike indicator filters out false positives.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
It is to be understood that the invention that is now to be described is not limited in its application to the details of the construction and arrangement of the parts illustrated in the accompanying drawings. The invention is capable of other embodiments and of being practiced or carried out in a variety of ways. The phraseology and terminology employed herein are for purposes of description and not limitation.
During use, the intelligent strike indicator senses when a fish is biting and analyzes whether it is a true strike or a false positive. Once the intelligent strike indicator rules out false positives, it causes a light emitting diode to illuminate, indicating to the user that a fish is biting.
As seen in FIG. 1, the strike indicator may be housed internally in a fishing rod 1. A printed circuit board 2 may be located inside the rod 1. A power source 3 for the strike indicator may be located in the rod blank. The strike indicator includes a light source 4. The tip 5 of the fishing rod 1 may be made of translucent or transparent material to allow the light source 4 to be seen when activated. The light source 4 may be a light emitting diode and the power source 3 may be two 1.5 volt batteries.
As seen in FIGS. 2, 3, and 4, the strike indicator may be located within an external housing 6, which may be mounted on a fishing rod via attached means 7 of mounting the housing 6 on a rod. Alternately, the strike indicator may be located within a bobber 8, as seen in FIG. 5.
FIG. 6 is a circuit diagram illustrating the circuitry of the strike indicator. Mounted on the printed circuit board 2 are an accelerometer 9 and a microcontroller 10. Also mounted on the printed circuit board 2 may be capacitors 11. The accelerometer 9 may be a two or three axis digital or analog accelerometer. Furthermore, the accelerometer 9 may be a high sensitivity accelerometer. The microcontroller 10 may have an analog to digital converter. The microcontroller 10 may also have a serial interface to interface with the accelerometer 9. The strike indicator may also comprise two schottky diodes 12 as part of a charge pump to allow the use of only two batteries to power the light source 4 instead of three. The strike indicator may additionally comprise a radio transmitter/microcontroller combo 13 and an antenna 14.
When the strike indicator also comprises a radio transmitter/microcontroller combo 13, the transmitter communicates with a handheld device to allow remote monitoring of the fishing equipment. The wireless system may include a Zigbee protocol or other wireless mesh networking stack to allow equipment far from the user to use other equipment as repeating stations to increase communication distance. Within this protocol channel, information may be included so that each angler has monitoring capability only over his equipment. This prevents cross talk between multiple anglers using the wireless equipment. The protocol may also contain indicator information data so that when multiple strike indicators are used with the same handheld device, the user will be able to distinguish on which piece of equipment the strike is occurring. This data may include both device type data and device number identifier. The protocol may also contain strength of strike information, which will be displayed on the handheld as well.
The strike indicator detects movement of the fishing rod and determines whether the movement fits the criteria of a fish biting. If so, the light source is activated, signaling to a user that a fish is biting. The intelligent strike indicator utilizes the accelerometer integrated circuit and the microcontroller integrated circuit to rule out false positives. The indicator works by detecting movement of the fishing rod tip and comparing that movement to typical fish-strike movement. There are a few characteristic signals that are indicative of a fish strike. First, a large sudden strike by a fish will register as a large quick acceleration on the rod tip that is larger than any other stimuli other than the cast motion. This would be a large enough change in acceleration to initiate the start of the algorithm upon the next sample. Second, a light strike could conceivably be of smaller magnitude than wind or waves, but would still cause a greater change in acceleration because the strike would pose a significantly higher frequency than wind or waves. Therefore, this would trigger the algorithm. Lastly, a fish slowly pulling away causes the rod angle to change with respect to Earth's gravity. This would show a change in acceleration that would trigger the algorithm. Once the algorithm begins, more data is taken to further analyze the stimulus to determine whether the source is actually from a fish. This is done by canceling out signals that are periodic and non-decaying as well as calculating the angle of gravitational pull.
FIG. 7 is a flow chart illustrating the method by which the intelligent strike indicator filters out false positives. The first step is to determine whether the accelerometer is calibrated. If not, the next step is to calibrate the accelerometer and repeat the first step. If the accelerometer is calibrated, the next step is to determine whether a strike occurred state is true, which indicates that a strike previously occurred and the strike occurred state was set to true pursuant to this algorithm. If the strike occurred state is true, the light source is activated. The light may flash rapidly at first, then with decreased frequency as time passes to indicate to the user how long it has been since the strike.
After determining the strike occurred state, the microprocessor determines whether the acceleration detected by the accelerometer is greater than a given strike setpoint. If not, the strike indicator enters a timed sleep mode for power savings. If the acceleration is greater than the given strike setpoint, a number of samples are taken and placed in a buffer for processing. The microprocessor then determines whether a certain percentage of the samples in the buffer are greater than a value that would indicate a cast. A cast is characterized by a long-term, large, continuous acceleration. The purpose of this step is to eliminate accelerations caused by casting and to reset the device and the strike occurred state. If a cast is determined to have occurred, the microcontroller deactivates the light source, ignores all motion for a given time (such as 10 seconds) to allow the angler to place the rod, and sets the strike occurred state to false. The strike indicator then enters a timed sleep mode.
If the samples are not greater than the setpoint for a cast, the microcontroller determines whether the angle of the rod has changed. If so, this indicates a fish is biting and the strike occurred state is set to true, and the strike indicator enters a timed sleep mode. If not, the microcontroller determines whether the acceleration is periodic and non-decaying. If so, this indicates that the motion is due to a source other than a fish biting, such as waves, the motion of a boat, etc. Therefore, the strike indicator enters a timed sleep mode. However, if the acceleration is not periodic or is decaying, this indicates a fish is biting, and the strike occurred state is set to true before the strike indicator enters a timed sleep mode. In the instances where the strike occurred state has been set to true, the light source will be activated when the device wakes from timed sleep and the algorithm begins again.
When the intelligent strike indicator has determined that a fish is biting, it causes the light source to illuminate. Additionally, it may cause a buzzer to sound and/or send a radio signal to a handheld device that alerts the user to the strike. The light may blink quickly when the strike is first detected, then blink with decreased frequency as a function of time in order to indicate the duration of time that has elapsed since the strike. If the intelligent strike indicator has a handheld sensor, the sensor displays the time that has elapsed since the strike.
While the invention has been described with a certain degree of particularity, it is manifest that many changes may be made in the details of construction and the arrangement of components without departing from the spirit and scope of this disclosure. It is understood that the invention is not limited to the embodiments set forth herein for purposes of exemplification, but is to be limited only by the scope of the attached claims, including the full range of equivalency to which each element thereof is entitled.

## Claims

1. A method of indicating when a fish bites, where said method comprises the steps of:
utilizing a fishing rod with a strike indicator for indicating a fish bite while fishing, where said strike indicator comprises:
a light source;
a power source;
a printed circuit board;
an accelerometer integrated circuit mounted on said printed circuit board; and
a microcontroller mounted on said printed circuit board;

detecting an acceleration on said fishing rod with said accelerometer integrated circuit;
beginning an algorithm with said microcontroller to determine whether said acceleration is due to said fish bite, where said algorithm filters out false positives, where said algorithm comprises the step of determining whether an angle of said fishing rod has changed by calculating an angle of gravity; and
activating said light source at a rate that indicates how much time has passed since said light source began flashing if said microcontroller determines said fish bite.

2. The method of claim 1 where said algorithm further comprises the steps of:
determining whether a strike occurred state is set to true, where said strike occurred state set to true indicates that a strike previously occurred and said strike occurred state was set to true pursuant to said algorithm;
if said strike occurred state is set to true, activating said light source;
regardless of whether said strike occurred state is set to true or false, determining whether a change in said acceleration has occurred;
if said change in said acceleration has not occurred, entering a timed sleep mode;
if said change in said acceleration has occurred, taking multiple samples of accelerations and adding said samples to a buffer and proceeding to determine whether a certain percentage of said accelerations in said buffer is large enough to indicate a cast;
if said certain percentage of said accelerations in said buffer is large enough to indicate said cast, deactivating said light source, ignoring future accelerations for a certain length of time, setting said strike occurred state to false, and entering said timed sleep mode;
if said certain percentage of said accelerations in said buffer is not large enough to indicate said cast, determining whether said angle of said fishing rod has changed by calculating the angle of gravity;
if said angle of said fishing rod has changed, setting said strike occurred state to true and entering said timed sleep mode;
if said angle of said fishing rod has not changed, determining whether said acceleration is non-decaying and periodic;
if said acceleration is non-decaying and periodic, entering said timed sleep mode; and
if said acceleration is not periodic or is periodic and decaying, setting said strike occurred state to true and entering said timed sleep mode.

3. The method of claim 1 further comprising a plurality of capacitors mounted on said printed circuit board.

4. The method of claim 3 where said plurality of capacitors totals 4.

5. The method of claim 1 where said light source is a light emitting diode.

6. The method of claim 1 where said power source is two 1.5 volt batteries.

7. The method of claim 1 where said strike indicator additionally comprises a radio transmitter and a remote handheld device that receives and analyzes transmissions from said transmitter.

8. The method of claim 1 where said strike indicator is internally housed within said fishing rod.

9. The method of claim 8 where said fishing rod comprises a transparent rod tip.

10. The method of claim 9 where said transparent rod tip is designed to maximize light output from said light source.

11. The method of claim 8 where said fishing rod comprises a translucent rod tip.

12. The method of claim 11 where said translucent rod tip is designed to maximize light output from said light source.

13. A method of indicating when a fish bites, said method comprising the steps of:
utilizing a fishing rod with a strike indicator for indicating a fish bite while fishing, where said strike indicator comprises:
a light source;
a power source;
a printed circuit board;
an accelerometer integrated circuit mounted on said printed circuit board; and
a microcontroller mounted on said printed circuit board;

detecting an acceleration on said fishing rod with said accelerometer integrated circuit;
beginning an algorithm with said microcontroller to determine whether said acceleration is due to said fish bite, where said algorithm filters out false positives, where said algorithm comprises the steps of:
determining whether a strike occurred state is set to true, where said strike occurred state set to true indicates that a strike previously occurred and said strike occurred state was set to true pursuant to said algorithm;
if said strike occurred state is set to true, activating said light source;
regardless of whether said strike occurred state is set to true or false, determining whether a change in said acceleration has occurred;
if said change in said acceleration has not occurred, entering a timed sleep mode;
if said change in said acceleration has occurred, taking multiple samples of accelerations and adding said samples to a buffer and proceeding to determine whether a certain percentage of said accelerations in said buffer is large enough to indicate a cast;
if said certain percentage of said accelerations in said buffer is large enough to indicate said cast, deactivating said light source, ignoring future accelerations for a certain length of time, setting said strike occurred state to false, and entering said timed sleep mode;
if said certain percentage of said accelerations in said buffer is not large enough to indicate said cast, determining whether an angle of said fishing rod has changed by calculating an angle of gravity;
if said angle of said fishing rod has changed, setting said strike occurred state to true and entering said timed sleep mode;
if said angle of said fishing rod has not changed, determining whether said acceleration is non-decaying and periodic;
if said acceleration is non-decaying and periodic, entering said timed sleep mode; and
if said acceleration is not periodic or is periodic and decaying, setting said strike occurred state to true and entering said timed sleep mode; and
activating said light source if said microcontroller determines said fish bite.

14. The method of claim 13 wherein said step of activating said light source further comprises causing said light source to flash at a rate that indicates how much time has passed since said light source began flashing.

15. The method of claim 13 further comprising a plurality of capacitors mounted on said printed circuit board.

16. The method of claim 13 where said light source is a light emitting diode.

17. The method of claim 13 where said power source is two 1.5 volt batteries.

18. The method of claim 13 where said strike indicator additionally comprises a radio transmitter and a remote handheld device that receives and analyzes transmissions from said transmitter.

19. The method of claim 13 where said strike indicator is internally housed within said fishing rod.

20. The method of claim 19 where said fishing rod comprises a transparent rod tip or a translucent rod tip designed to maximize light output from said light source.