Basically I have an arduino uno switching 8 relays controlling 8 120v outlets. I am confident with the code but with the high voltage hooked up to the relays witch control 8 air bags under a room. We have the high voltage in the same control box as the low with the uno. We are using the internal pull up resistors. We have even tried external pull down resistors. Could having the uno in the same box with the switching 120 volts be causing the program to loop? Causing a false signal to the input pin?