I beg your pardon I forgot to enclose the schematic, it is really simple.
I do not see how to attach pictures, let me write it:
- SCL pin from DJI battery to A5 Arduino
- SDA pin from DJI battery to A4 Arduino
- GND pin from DJI battery to GND Arduino
- two resistors from SDA and SCL pins tied together to +Vcc Arduino.
I can not explain why but this is the note I found in the sketch lines 12 to 14.
"Configured for Arduino UNO R3 you will need to use external pull up resistors of
4.7k-ohm to pull the SDA and SCL lines up to 3.3v "