As title, I have 3 batteries connected in series composed by 7 cell each. I have several Arduino nano and I want to use one on each battery pack to measure all cells voltage. Then they will be queried by I2C protocol to get cells values.
Since this batteries are connected in series and all Arduino have a common power supply source, I'll get a short between + and - on each battery if I use this common configuration:
How can I avoid this? Is there a simply solution like place a diode on each GND line?