摘要：Single phase induction motors are the most widely used motors for home appliances. The AC induction motor has a simple rugged design. Other advantages include low cost, low maintenance and can be connected directly to an AC power source. When power is supplied to an induction motor at the recommended specifications, it runs at its rated speed [1]. However, many applications need variable speed operation. One of them is a fan. This paper presents a design of a microcontroller based motor controller with heat sensor which is used to vary the speed of a motor in a smart home. The discussion includes the design of a controller that varies the speeds of the motor with respect to the ambient temperature in a smart home environment. The controller is embedded as an addition to a stand fan. A phase control method is selected to be implemented in this design. The power delivery to the motor is controlled by the firing angle of a Triac where it controls the AC power supply. With the firing time controlled by the Triac, the input power to the motor can be controlled accordingly. In addition, a hand-clap circuit is also introduced which acts as a switch to activate or deactivate the motor
