Temperature sensing is the basis of thermostats. Thermostats usually use thermal elements to sense temperature, such as thermistors, thermocouples, etc. These thermal elements are able to change resistance or voltage in response to changes in temperature, thereby converting the temperature signal into an electrical signal. These electrical signals are transmitted by the sensor to the controller for processing. Feedback control is the key to thermostat temperature stability. In the thermostat, the controller will act on the temperature signal transmitted from the sensor