Travel

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TO DO

  • Check tire pressure
  • Remove luggage rack
  • Mount bike rack
  • Charge batteries for BT keyboard
  • Charge battery in emergency phone
  • Charge HT batteries
  • Garmin 62 - load pocket queries

Hacking

  • SenseCAP Indicator and cables
  • Seeed CANBUS adapter
  • Hookup Grove to CANBUS
  • OBD-II to CANBUS
  • Laptop and charger
  • Laptop adapter (USB)
  • Comp notebook
  • USB3 hub
  • 5V supply
  • M5StickC with micropython and PIR hat
  • M5 Atom Echo speaker
  • 3 x USB-C cables

Raspberry Pi

  • Pi 4
  • 4" monitor
  • Logitech KBD and mouse and USB dongle
  • USB3 drive

Tools

  • screwdrivers
  • needle nose pliers
  • small cutters
  • red voltmeter
  • usual tool kit in bag, screwdrivers, torx drivers, usb cables

CAN Bus

Open Garages

https://medium.com/@yogeshojha/car-hacking-101-practical-guide-to-exploiting-can-bus-using-instrument-cluster-simulator-part-i-cd88d3eb4a53

Connecting

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.

Termination

https://electronics.stackexchange.com/questions/470382/can-bus-termination-resistors-for-can-logger-device

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.)

Pinouts

OBD2 pinouts

Signals that matter to me, and the wire colors:

5 signal ground -- orange

6 CANH -- Black

14 CANL -- Green

16 12V always on -- Brown


https://www.14core.com/wiring-the-mcp2515-shield-with-obd-on-arduino/ connector info

https://www.14core.com/wiring-the-mcp2515-controller-area-network-can-bus-diagnostics/

Interfaces

MCP2515

I intend trying the MCP2515 chip first because it's commonly used. Microchip MCP2515 datasheet

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

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.

Seeed's board uses the TI 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.

https://github.com/kvba1/ESP32-MCP2515-OBD2-CANBUS ESP32 + MC2515

https://github.com/yogiD/MCP2515-OBD Arduino + MCP2515

GD32E103CA

Seed + Grove from Longan Labs https://github.com/Longan-Labs/Serial_CAN_FD_Module

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.

ICSIM on Raspberry Pi

ICSIM = Instrument Cluster Simulator = test CAN bus without breaking your car. Also, you can do bench testing!

https://github.com/zombieCraig/ICSim

Software

Starting from Bookworm on a Pi 5

 sudo apt-get install libsdl2-dev libsdl2-image-dev can-utils

Hardware
SPI to Pi


Xiao MCP2515 module: This article is a close match for what I am doing. Adding CAN controller to Raspberry Pi I only bought one, grrr.

It would be easier to connect the GD32 board since it's Grove, but I'd need software for that.

Resources

https://copperhilltech.com/ Pi and Arduino boards for CAN bus, OBD-2, NMEA, etc

Learn about CAN Bus from SEEED