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| * red voltmeter | | * red voltmeter |
| * usual tool kit in bag, screwdrivers, torx drivers, usb cables | | * usual tool kit in bag, screwdrivers, torx drivers, usb cables |
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| == CAN Bus ==
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| === Open Garages ===
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| https://medium.com/@yogeshojha/car-hacking-101-practical-guide-to-exploiting-can-bus-using-instrument-cluster-simulator-part-i-cd88d3eb4a53
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| === Connecting ===
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| I got an OBD-2 extension cable with 90 degree ends to make a low profile connection. I cut the cable in half. (Photo!) Now I have a connector with a 12" cable ready to use.
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| ==== Termination ====
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| https://electronics.stackexchange.com/questions/470382/can-bus-termination-resistors-for-can-logger-device
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| I don't need termination as long as my cable is less than 0.5m long. (It was 18" but I snipped it down to be on the safe side.)
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| ==== Pinouts ====
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| [[File:Screenshot 2024-09-13 124245.png|left|thumb|480x480px|OBD2 pinouts]]
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| Signals that matter to me, and the wire colors:
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| 5 '''signal ground''' -- orange
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| 6 '''CANH''' -- Black
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| 14 '''CANL''' -- Green
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| 16 '''12V''' always on -- Brown
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| https://www.14core.com/wiring-the-mcp2515-shield-with-obd-on-arduino/ connector info
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| https://www.14core.com/wiring-the-mcp2515-controller-area-network-can-bus-diagnostics/
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| === Interfaces ===
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| ==== MCP2515 ====
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| I intend trying the MCP2515 chip first because it's commonly used. Microchip [https://ww1.microchip.com/downloads/en/DeviceDoc/MCP2515-Stand-Alone-CAN-Controller-with-SPI-20001801J.pdf MCP2515 datasheet]
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| I got this breakout board: Seeed Xiao https://www.seeedstudio.com/Seeed-Studio-CAN-Bus-Breakout-Board-for-XIAO-and-QT-Py-p-5702.html
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| I got two, so one will have a 6 pin header soldered to the SPI connector and the other will have a Xiao ESP32C6 installed.
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| Seeed's board uses the TI [https://www.ti.com/lit/ds/symlink/sn65hvd230.pdf?ts=1685579002848&ref_url=https%253A%252F%252Fwww.google.com%252F SN65HVD23x 3.3-V CAN Bus Transceiver] so it's all 3v3 and that means it can work with a Pi. Some older boards use 5V transceivers.
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| https://github.com/kvba1/ESP32-MCP2515-OBD2-CANBUS ESP32 + MC2515
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| https://github.com/yogiD/MCP2515-OBD Arduino + MCP2515
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| ==== GD32E103CA ====
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| Seed + Grove from Longan Labs https://github.com/Longan-Labs/Serial_CAN_FD_Module
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| This board has a UART on its Grove port, so in theory Pi + Grove and I should be able to see it on a serial console. Right? Easy easy easy?? Then use AT commands to confirm it functions.
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| === ICSIM on Raspberry Pi ===
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| ICSIM = Instrument Cluster Simulator = test CAN bus without breaking your car. Also, you can do bench testing!
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| https://github.com/zombieCraig/ICSim
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| ===== Software =====
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| Starting from Bookworm on a Pi 5
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| sudo apt-get install libsdl2-dev libsdl2-image-dev can-utils
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| ===== Hardware =====
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| [[File:Screenshot_from_2024-09-13_17-06-16.png|alt=|left|400x400px|SPI to Pi]]
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| Xiao MCP2515 module: This article is a close match for what I am doing. [https://www.beyondlogic.org/adding-can-controller-area-network-to-the-raspberry-pi/ Adding CAN controller to Raspberry Pi] '''I only bought one, grrr.'''
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| It would be easier to connect the GD32 board since it's Grove, but I'd need software for that.
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| == Resources ==
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| https://copperhilltech.com/ Pi and Arduino boards for CAN bus, OBD-2, NMEA, etc
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| [https://www.seeedstudio.com/blog/2019/11/27/introduction-to-can-bus-and-how-to-use-it-with-arduino/ Learn about CAN Bus] from SEEED
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