I bought a 5 V Relay Board: LINK (Aliexpress) and just realised it's "Active LOW". I want to control a water pump via a Arduino Micro.
I tested it and as far as i understand the workings of this relay, putting the pin to LOW activates the little LED on the Relay Board and switches to the NC position where I connected the water pumps ground wire.
I don't feel very comfortable with that because normally those relays are activated by setting the pin to HIGH. I tried to connect the ground wire of the pump to the normally open position but than, if I disconnect the Arduino to simulate a malfunction the pump keeps running.... this doesn't happen with the first configuration.
So my Question: Is it a problem to use the Relay Board in the way described above (Pin to LOW switches Coil to NC Postion). Is there a way I'm not seeing to get the Board to switch the Coil if a pin is set to high.