OK, so, I have this tank that I use to grow cool growing orchids in. It's a ten gallon aquarium with a dorm fridge evaporator in it. The compressor and the condenser coil are outside the tank.
Right now I turn it on at night using the built in fridge thermostat, which, to put it mildly, sucks.
Basically, the thermostat has three wires that go to a start relay for the fridge compressor. Hot, neutral, ground. When the thermostat closes the circuit, the start relay for the fridge compressor fires and the fridge runs. When the temperature set point is reached, the thermostat opens the circuit and the fridge turns off. basically, I want to remove the built in thermostat and use an arduino thermostat to open or close the circuit to the start relay. I'm assuming I need to find a solid state relay that will handle the current/voltage that runs through the existing thermostat. Then control the relay state using something like a 5 volt pin from the arduino?