Random Relay 6 pins / 3 pins works, 3 does'nt. What's wrong?

Projects Programming
7

Ok!!
Thank you for your eyes :slight_smile:

Fact is that the Nanos I recieved arn't working with Board : "Arduino Nano"
Only with "Mini" or "Arduino/Genuino Uno".

So it made me think about a bigger problem.

Thank you again