This is a small side project I'm working on. What I'm basically trying to do is to read the temperature values from a TMP36 sensor and based off that reading turn a heating pad on or off. So far, I am getting the temperature readings correctly. I am now confused on how to hook up the heating pad to the overall circuit. Will I need an external power supply both the Arduino and heating pad or will the Arduino be sufficient enough?
You need a external powersupply because the pad draws up to 1A, the Arduino can only provide about 0.5A. About the wiring, take a look at the Schematic I draw. (The values of the resistors don’t need to be exactly as shown)