So I got everything hooked up/soldered together and it was all working great. The relay was clicking on when I wanted it to. The power supply had everything going without any smoke or flames. And then I hooked up the solenoid valve to the relay. It clicked on once and then the relay stopped working. The light on the Nano is still on and yet the relay light is no longer blinking. I guess I should see if there is any voltage coming from pin 8 (the one hooked up to the relay.
The solenoid power was coming directly off of the power supply, not from the Nano. Should I have put a diode in there somewhere? I'm really new to electronics as I am a logger. 
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