A digital thermostat controls temperature by utilizing sensors to measure the current temperature in a room or area. These sensors can be thermistors or bimetallic strip devices. The thermostat then compares the measured temperature to the desired temperature set by the user.
If the measured temperature is higher than the desired temperature, the thermostat sends a signal to the cooling system (such as an air conditioner) to turn on. Conversely, if the measured temperature is lower than the desired temperature, the thermostat sends a signal to the heating system (such as a furnace) to turn on.
The thermostat continues to monitor the temperature and adjusts the heating or cooling system accordingly. Once the measured temperature reaches the desired temperature, the thermostat signals the system to turn off.
Digital thermostats often offer additional features such as programmability, allowing users to set different temperatures for different times of the day, and Wi-Fi connectivity, which enables remote control and access from smartphones or other devices.