I have a system that switches a 24 Volts (AC) wire with a relay, the relay is been switched by the Arduino with use of a transistor and a alternative power supply for the relay. On the PCB are 6 relay's wich each of them switch a 24 Volts (AC) wire. When I make an input high, to let the relay switch, it sometimes occurs that the other relay's (not specific one) become high and switches the 24 Volts (AC) wire. I've tested the system without the 24Volts circuit, and it works just perfect. Can I change something in the circuit to let the 24 Volts (AC) wire have no influence? I have already connected 10K resistors from the input to the ground, but it seems nog enough.
I hope my explanation makes sense.