pi-telemetry

Gathers telemetry via CAN BUS from a Haltech ECU and writes to a file.

Eventually, this data will be transmitted via APRS using Direwolf.

Requirements

Hardware

• Raspberry Pi Zero 2W (with headers)
• Waveshare CAN Hat

Software

• Python 3.9+
• Python dependencies are declared in pyproject.toml. To install runtime dependencies:
  • On Raspberry Pi OS
    • sudo apt install python3-can
  • Using pip:
    • Runtime only: pip install .
    • Development (adds Black): pip install -e .[dev]
• Add the following lines to your Raspberry Pi boot config (/boot/firmware/config.txt), then reboot.

  dtparam=spi=on
  dtoverlay=mcp2515-can0,oscillator=12000000,interrupt=25,spimaxfrequency=1000000
  

Usage

./startup.sh

This will write the data to a file, telemetry_data.csv, with a single line of values. Feel free to modify this to suit your needs; I only want the latest values for parsing using Direwolf to send via APRS.

Example output

coolant_temp_celsius,oil_temp_celsius,fuel_level_gallons,abs_error,check_engine
15.35,20.55,2.91,False,False

Resources

• Waveshare documentation and sample project (the basis for this repo).
• Haltech ECU CAN broadcast protocol
• Haltech CAN protocol specification