Along with all these devices most of the temperature controller systems have visual indicators (like bulb, LED) for over/ under temperature and sound alarms for audio alert. In this system as the actual sensed temperature increases above certain limit over set temperature, the cooling is increased using cooler/compressor and vice versa. For example, the temperature controlling device is cooler/compressor and it is required to maintain cooling. If actual temperature is higher or lower than require set temperature then it gives signal to temperature controlling device to increase or decrease the temperature and thus it tries to maintain the temperature within required limit. It compares actual temperature with set temperature.
The controlling device like micro controller, takes both these temperatures as inputs and display them on display device. The temperature senses actual temperature. The required temperature is set using temperature setting device like potentiometer.
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