So far, I have a pretty successful arduino setup... checking multiple temperatures of an aquaponics setup, water levels, lights, etc. I was noticing that my pH values were very low (~3), so did a ton of reading, and everything seemed to point to a lack of power... easy! I threw a 12v 1A power supply to my arduino, and everything seems to be working nicely now, except my relay!
I have the relay running on it's own 12v power supply, power going to Vin, the normally closed pin and ground. I have my arduino power to Vcc, ground (common ground between both external power supplies) and the individual control pins, so everything SHOULD be separate. The problem is, the relay now will switch between open and closed constantly, with no break between... constant clicks.
Anyone run into anything like this? Obviously it's something I've done, I just don't know what!