I’ve been using Peters OBDII C&C for quite a while now, and while I like it’s features, it lacks the intuitiveness of a modern smartphone app. So I thought it’s about time to improve this!

System Architecture

Two MCUs are working together to read the OBDII data from the car, and transmit it vie BLE (Bluetooth Low Energy). The data is transmitted to the smartphone, where it is visualized.

The two controllers are one PIC and one ESP32, the PIC is programmed by Peter, and used to interface the OBD, while the ESP32 is programmed by me, used for forwarding the data to the smartphone.

Both MCUs communicate via UART.

See a first running demo of it here: