OPCM (Open Source Power-train Control Module)

Have an older vehicle without a PCM? Maybe a Fummins with a 24 valve or common rail swap. This project aims to add OBD2 over CAN-bus to any vehicle, and support different combinations of inputs and outputs over time.

There is a LOT of room for improvement, and I'm just getting started here.

Features

Working

• 12v PWM Speedometer input (with optoisolator)
• 5-24v 60-2 camshaft sensor tachometer input (with optoisolator)
• 12v PWM Speedometer output (with optoisolator)
• 12v PWM Tachometer output (with optoisolator, needs input)
• Basic OBD2 via CAN-BUS output (speedometer and tachometer)
• Transmission Temperature Sensor
• Transmission Pressure Sensor
• Nextion output (custom displays)
• configuration via configuration.h (modeled after Merlin for 3d printers)
• Cummins-bus input (24v cummins)

In Progress

• Torque Control for shifting (Via Cummins-bus)

Future

1. 5v sensor inputs
2. Suggestions?

Hardware

This project currently uses a Teensy 4.1, 2 CAN-bus transceivers(to send data), and a few optoisolators

Teensy 4.1(31.50USD)

SN65HVD230 CAN Board(4.99USD)

ADS1115 16-Bit ADC - 4 Channel with Programmable Gain Amplifier(14.95USD)

This makes the hardware I'm currently using 56.43USD, not to shabby! In the future it would be nice to have a custom PCM that combine all these things onto one board, but baby steps.

Also, a Nextion display can be as much as 150USD, but totally worth it for me :)

Pins

0. Cummins Bus RX
1. Cummins Bus TX
2. Speedometer Output
4. Tachometer Input/Output
5. Speedometer Input
7. Nextion RX(RX2)
8. Nextion TX(TX2)
34. Wait To Start
35. High Beams
36. Right Blinker
37. Left Blinker