Retrieve battery diagnostic data from your smart electric drive EV.

An Arduino with CAN bus shield to connect to the diagnostics port (OBDII-connector) of your car. Get the hardware and use an appropriate cable for the physical connection. See the schematics for making your own cable.

• Download the repo-ZIP, then copy the files to your Arduino folder. The folder structure should look like this:

• Open the ED_BMSdiag.ino file and compile / upload it to the Arduino board.

Please see the wiki for further information.

Connect the CAN shield to the OBDII-connector and power up the car.

This simple version will display the diagnostics via a serial USB connection. You need to open the serial monitor of the Arduino-IDE. Verify that the baud rate is set to 115200. The readout will be started by entering a serial command / keystroke in the top input line. You will get an text output of the current battery status.

     | ... read HV-Battery voltage even with contactors open
     | ... get HV-DC-Isolation in kOhm (reliable with contactors closed)
     | ... get info about hardware- / software-revision of battery

v0.35a | Bugfix to continue reading messages if one was skipped | ... show 0.00kW power instead of -300.00kW v0.35 | Added new readouts | ... realSOC, current, power, time from BC | ... EXPERIMENTAL: initial capacity & loss | Changed data formatting and code cleanup v0.31 | Fixed overflow in ODO calc. | ... no special ASCII-characters for int. support v0.30 | Added more readout data and reformatted the output | ... ODO, 12V battery, HV-unit production date | ... temperatures of battery modules | ... # of cell at min, max (in individual cell data) v0.24 | Overall improvements | ... added Doxygen compatible comments | ... added standard deviation calc. | ... changed formatting | Average.h (please reload library) | ... corrected vice versa cell mapping | ... overflow corrected v0.21 | Waiting for serial init | Showing status of OBD port (CAN-Bus) v0.2 | Initial Commit | Tested with Arduino R3 and Sparkfun CAN-Bus shield