I'm wondering what the arduino reads on an input pin. I have a separate circuit that uses a relay that when the relay trips I want my wav shield attached to my arduino uno to play a sound. My separate circuit is already working and the relay trips when I need it to. I just want to add this extra sound and I have my wav shield and arduino already doing another task right beside this circuit. I am thinking I can just run 5V through the relay so when it trips it goes to say pin 6 on my arduino. Then the arduino will do a digitalread on pin 6 and see a HIGH value. Is this right or am I thinking about this wrong.