Here is the project description:
A Water Chiller: Peltier module will cool a small radiator. Peltier is 12v. Fan in radiator is 12v. There will be a thermometer on the water output to get a reading of water temperature, and if necessary, manually control the Peltier voltage to increase or decrease temperature.
Question: How do I turn Arduino’s 5v to 12v for the Peltier and the fan?
Thanks a lot for the help.