In my last blog, I explained how CAN and OBD-II let a car’s ECUs talk with each other and how a scan tool listens in. What I skipped over on purpose is the tiny chip that makes any of that possible: the CAN transceiver. Without it, your microcontroller is basically shouting into a wall. This is what a CAN transceiver looks like: CAN Bus transceiver Communication Module Based on SN65HVD230 The Translator Your ESP32 has a CAN controller built in, on ESP32 it’s called TWAI. Tha