Hello friends, I am using a 8-relay board to control certain electrical gadgets.And I am controlling it with a custom made arduino compatible board. Once I get an input in pin 12, it will turn on all the relays connected right from pin 2 to 10.
A strange problem which i am facing is that, when ever I connect a relay through the ULN2803 ic, the relay is continuously turning on and turning off. But when I touch the usbport on the arduino board or connect the ground pin to earth, there is no such problem. More over when I connected a LED between the respective output pin and ground, I was able to see the LED glow with mild flickering.
Am I having any unnecessary noise in my circuit, if so please can any one explain me what is happening and what should I do to fix this problem.