supplies a vehicle with 12V, while type B supplies the vehicle with 24 voltage. As a standard, the OBD-II connector is required to be within 2 feet of the steering wheel. Manufacturers have the option of implementing among five signaling protocols, the only ones permitted with the OBD-II interface. For example, one of the five protocols, the SAE J1850 VPW, known as, variable pulse width is the standard of General Motors. This standard includes a high voltage of +5 V, a message length restriction of 12 bytes, and a multi-master arbitration scheme. 5.8 RS-232 In order to establish the connection between the OBD-II IC and the OBD-II connector on the user’s vehicle we will be utilizing an RS232 interface. This interface will be responsible for establishing the serial connection present in the vehicle. In this standard user data is sent as a time-series of bits. As this is a form of serial communication it is similar to UART. Neither of these devices will serve as a slave or master, and the clock must be defined on both devices in order for the communication to be successful. Communication using this ranges from +3 to +15 volts. For data transmission lines logic 1 is defined as a negative voltage. Logic 0 is positive and the signal condition is termed “space”. 5.9 git Git is free and open source version control system. We will be able to host our own git server on a virtual machine or we will be able to create a repository on a website such as Github or BitBucket. Utilizing git will us to collaborate on the paper and keep track of changes. In addition, this will give us a centralized place to work on the paper, so in the event of an accident the paper will still be intact. We will also be utilizing version control for the microcontroller software development process.
negative cable to the ground and Accelerometer 14 Attach the positive cable of multimeter to the pin 1, and attach the negative cable to the ground The voltage between two node is zero. If it is not, there might be some open circuit or connection problems 15 Attach the positive cable of multimeter to the pin 15, and attach the negative cable to the ground The voltage between two nodes should be zero 16 Attach the positive cable of multimeter to the pin 16, and attach the negative cable to the ground The voltage between two nodes should be zero 17 & 18 Attach the positive of multimeter to the pin 17&18 individually, and attach The voltage between two nodes should be zero
of both nodes. Attach the red cable of multimeter to pin 2 and attach the black cable to the other side The voltage between two should be zero V. 3 Visually check the connection at pin 3 There should not have any wire connected to it. 4 Measure the resistor between pin 4 and input source of 3.3V The resistor should be 100k ohms, if it is not, then change the resistor value or check the connection of both nodes. 5 It’s PWM_RX, attach the red cable of multimeter to pin 5 and attach the black cable to the other side The voltage between two nodes should be zero V 6&7 Both pins are J1850 Bus, not use There should not have any
resistor value between pin 15 and input source 3.3V should be 100k 17 Use the multimeter to check the resistor value between pin 17 and input source 3.3V The resistor value should be 1k 18 Use the multimeter to check the resistor value between pin 18 and pin 19 The resistor value should be 100k 20 Use the multimeter to the capacitor between pin 20 and ground The capacitor should be 10uF 21 & 22 Use the multimeter to check the resistor value between pin 21/ 22 and input source 3.3V The resistor value should be 100k ohms 23 & 24 & 25 & 26 Not use, visually check theses pins There should not have any wire connected 27 Ground node The voltage
BLE Module CC2640 BLE Module Buck Regulator LM2574x Boost Regulator TLV61225 Comparator CD74HC85E Charge Pump TPS60204 OBD UART Interpreter IC STN1110 Accelerometer LSM9DS1 Switching Regulator LM2574 Switching Regulator LM2594 Switching Regulator TPS62172 Switching Regulator TPS62177 Linear Regulator & Switching Regulator Fundamental LM2940, LM2952, LM2953, LM2954 Appendix E - References Texas Instruments. (2016, June). SYS/BIOS (TI-RTOS Kernel) User’s Guide (v6.46) [Online]. Available: http://www.ti.com/lit/ug/spruex3q/spruex3q.pdf Arduino - SPI. (n.d.). Retrieved December 05, 2016, from https://www.arduino.cc/en/Reference/SPI Instruments. (2016, June). TI-RTOS 2.20 User’s Guide (Rev. M) [Online]. Available: http://www.ti.com/lit/ug/spruhd4m/spruhd4m.pdf