Room Temperature Control using On-Off Controller

Abstract

The objective of the project is to maintain the temperature of a room constant using on-off controller. In this project, a control logic is developed and implemented using electronics components. The room is made of aluminium sheet. The logic circuit drives the bulb and exhauster fan fitted in the room. The bulb is used to heat the room, and the exhaust fan is used to cool the same. The temperature of the room is measured with TMP 103 sensor. The room temperature from the sensor is compared with a set value given from a potentiometer. Depending on the compared value the logic circuit decides its control action to be taken, and the overall system becomes a feedback control system. If the set point value is above the sensor measured value, the bulb is turned on and at the same time fan is turned off to increase temperature. If the temperature measured is above the set point then bulb is turned off and fan is turned on decrease the temperature.