This is a very silly question. I am a newbie in Electronics and Arduino. I want to know if i can get the current status of LED which is connected with a 9V battery. I tried to read using digitalRead but it is always returning 1 no matter what.
All i want to know is, If i turn ON some equipment using arduino and relay, Is there any way to check that the equipment is really ON?
I'm using NodeMCU v3 Wifi.