I am trying to use 2 channel relay module. with one channel relay, there is no problem, but with 2 channels it doesn't work properly. After working some while whether pneumatic valves start blinking(works and stops) or the ar4 software stops working.
I tried 5 channel relay module and try to use 2 different relay module separately as well.
pneumatic valves wired with 24v.signals go 5v via arduino.