Abstract:
Exhaust fan as one of the common electrical appliance that widely used for home and industry, is mostly still operated manually. However, this condition can be modified into automatic operated by adding processor unit and also several supporting electrical components. Automatic in this project means exhaust fan can operate in different levels of power, based on sensor TGS 2600 reading. However, the range of sensor reading is decided manualy. In order to control and to process, microcontroller AT89S52 is utilized both in hardware and software to be able to control the fan, as the load. To limit amount of electric source supplied to the load, triac is used as high speed switching device. Zero crossing detector will be required in AC volage controller to obtain ideal range of triac firing, by pulsing each time AC wave form hit zero point. Since the load is AC sourced, the suitable theory that used is phase control using triac, or also called phas firing angle. The result of this project is obtained by comparing collected data with calculation; however, there is deviation between calculated result practical result. On the other hand, the load is responding very well toward sensor reading. By controlling its voltage, it means power consumed also reduces which directly contributes to energy saving and efficiency.
