https://github.com/sixline/picoeca

Raspberry Pi Pico/RP2040 project to read Ethanol % and temperature from a GM flex fuel sensor and transmit via CANBUS.
https://github.com/sixline/picoeca

canbus ethanol flex flexfuel fuel pico raspberry-pi rp2040

Last synced: 8 days ago
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Raspberry Pi Pico/RP2040 project to read Ethanol % and temperature from a GM flex fuel sensor and transmit via CANBUS.

• Host: GitHub
• URL: https://github.com/sixline/picoeca
• Owner: Sixline
• License: gpl-3.0
• Created: 2024-08-02T22:41:09.000Z (11 months ago)
• Default Branch: main
• Last Pushed: 2024-08-03T00:32:41.000Z (11 months ago)
• Last Synced: 2025-04-05T21:45:03.002Z (3 months ago)
• Topics: canbus, ethanol, flex, flexfuel, fuel, pico, raspberry-pi, rp2040
• Language: C
• Homepage:
• Size: 2.23 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.MD
  • License: LICENSE

Awesome Lists containing this project

README

        
# Pico Ethanol Content Analyzer - Raspberry Pi Pico/RP2040

This will read the frequency(Ethanol %) and low pulse time(C Temp) of a standard GM Ethanol content sensor, print it to USB serial, and then transmit a CANBUS message.

Uses the PIO for CANBUS, using this library: https://github.com/KevinOConnor/can2040

CANBUS message format can be set to whatever. Default is set to mirror the Zeitronix format. It will transmit 50% Ethanol, max temperature, and a faulted sensor state for any error condition. The error conditions being a disconnected or failed sensor, too low of a frequency(below 0%), and too high of a frequency(above 100%).

![Wiring Diagram.png](https://github.com/Sixline/PicoECA/blob/31fcc2172cd30a571ddddda284e793472f792b68/Wiring%20Diagram.png)

Tested with:

* VDO / CONTINENTAL SE1004S or GM 13577429. Connector for the sensor is a Delphi 13511132. Cheap connectors on AliExpress work great.

* Texas Instruments SN65HVD230 CANBUS transceiver. Again, cheap breakout boards on AliExpress. Depending on your application you may not may not need a 120 Ohm termination resistor. The boards I bought from AliExpress included them.

* QS-1205CME-3A buck converter, from AliExpress, to step down the vehicle 12V to 5V needed for the Pico.

Total cost was around $100.

![Completed Module.png](https://github.com/Sixline/PicoECA/blob/31fcc2172cd30a571ddddda284e793472f792b68/Completed%20Module.png)

```

Output Ethanol Content: % (Frequency Hz - 50)

Fuel temperature °C: [41.5 x low pulsewidth (ms)] - 81.25

Self diagnostics: Embedded (fuel contamination more likely as readings increase above 150Hz)

```