A development of CANBUS yaml code for use in ESPHome and Home Assistant, to expose Vehicle based data and entities for automation and monitoring. ** This Code is specific for the Peugeot Boxer MkIII and has no been tested on any other make / model ** (but should in theory work on Fiat Ducato and Citreon Relay models)

Hardware: ESP32-WROOM-Devkit v1 TJA1050 canbus transciever (5v)

Using a 5v powered ESP32-WROOM-DEvkit, wired with the Tx/Rx pins connected to a TJA1050 Canbus transceiver board. (with 5v power). the TJA1050 CAN High and Low are connected to the CAN-H (Blue) and CAN-L (White) wires on the back of the OEM Stereo - or to pins 1&9 on the ODB diagnostics port.

refer to <esp32-taj1050.jpg> in the files.

The CANbus that is exposed on the rear of the Stereo and ODB Port Pins 1&9, is a low speed BSI connected data bus, used to communicate with the BSI/BCM (Interfacing to Engine ECU, TPMS, Door Locks, etc) controlling , Instrument Cluster and Stereo.

The CANbus messages are sent at 50Kbps on the low speed B-CAN bus, in 29bit Hex format.

Typical messages that are sent on this bus are Vehicle Speed Door Lock Status Fuel Level Engine RPM Media/Volume Controls Date/Time Clock

It is therefore possible to intercept this traffic and create Sensors in ESPhome, integrating the data into Home Assistant.

A few options exist to sniff the canbus messages, for my project i purchased a WiCAN USB module which was easy to setup and get started without having to first develop my own CANbus ESP device.

More in depth details on the development can be found here. https://sites.google.com/view/homeassistant-campervan/can-bus-integration