Design and Fabrication of Automatic Temperature Controller with Cooling System

Abstract: Over the last decade, advances in electronics have made devices smaller, cheaperandfaster. Thisprojectisabouthowthespeedofafancanbecontrolled,basedontemperaturesensor.Itisalsoapartofsmarthomeapplicationwherethe fan will gradually increase its speed if the temperature is increasing. In general, home appliance fans need to be operated manually with the help of regulators with the variation of temperature, thus requires a repeatedly extra effort for regulatingthefanspeedwhichactstoouragony.Soastoreducethisextraeffort and to add comfort, it is intended in this paper designing an "Automatic Temperature Controlled Fan". In this project the main intension is to control the fan by heating the sensor, i.e. the thermistor, where the speed of the fan is dependent and controlled by any device's temperature like PC. As the temperature of the device increases or decreases, the speed of fan increases or decreases respectively. So it can be used mainly as a cooling device. By modifying the circuits lightly, it can also be used to control the room temperature, depending on the property of thermistor. The thermister used in the circuit here, decreases its resistance with increasing temperature, hence the electrical conductivity also increases, increasing voltage across it, resulting in an increment in the speed of the fan. Thus, it is possible to control the speed of the fan automaticallywhenthedevice'stemperaturevaries.Experimentcanbefollowed to evaluate whether this circuit can save energy through the use of temperature sensor and thus promote efficiency.