Arduino compatible project to interface with the BMS slave board on Tesla Model S modules.
The modules are daisy-chained together with a TTL interface. The interface uses a Molex 15-97-5101 connector and runs at 612500 baud. This can be a difficult baud rate to match with arduino compatible processors. The Arduino Due and Teensy 3.5/3.6 boards are confirmed to be able to generate a suitably close baud rate. The factory wiring to each module is comprised of two sets of 5 differently colored wires:
- Red = 5V input to the module
- Green = Gnd for power and signal
- Gray = Fault output
- Yellow = UART Wire
- Blue = UART Wire
The fault output is active low. Use your own pull up to the fault line and if the line is pulled low then a fault has occurred.
Here is a PDF that explains how the wiring between modules and the master board is supposed to be: https://cdn.hackaday.io/files/10098432032832/wiring.pdf