Everything's on the topic... The 8 pin of my Decimilia always read HIGH, except when it's connected to the ground. I believe this may be due to an overvoltage on this pin.
Do you think this is possible ?
How would you prevent this, when you use sensors which basically just closes a relay ? I think I might just add a 220ch937 resistor after the relay, which should just connect the +5V and the input pin.