bmw-obd2-display

My BMW F20 116i doesn't have a temperature gauge. So I made one myself.

The hardware shopping list is as follows:

ELM327 Bluetooth OBD2 adapter
ESP32 Devkit v1
Small 128*64 OLED display
Some wires, USB micro cable, a case.

Currently is shows the following information:

Oil temperature
Coolant temperature
Boost pressure
Highest achieved boost pressure
(When cranking with key-on-engine-off) lowest battery voltage

To-Do-s

I want to add the following features some time in the future:

Update to latest ELMduino library.
Properly check if data has been correctly received before continuing.
Use ELM327's voltage instead of reading through OBD2.
Monitor voltage when connection with ECU has not yet been established.
Speed up display rendering. (Drawing black box over old values, instead of full re-render?)
Make "kPa" text smaller.
Show battery voltage in the bottom-right.
Try to optimize code for faster execution. Readings per second is somewhat slow.
Disable ELMduino logging. Setting debug-to-serial parameter to false currently causes ELMduino to not be able to connect, it seems. Needs debugging.

Credits

Massive thanks to Powerbroker2 for the ELMduino library!