Design and Construction of a Speed Control for Direct Current fan using Temperature Sensor

Unregulated fan speed results to excessive power wastage and over exposure to cold leading to various sicknesses especially in tropic regions like Northern Nigeria. This study designed and constructed a speed control for direct current fan using a temperature monitoring sensor. Simulation of the circuit was carried out using Proteus 8.0 and a prototype was constructed on a Vero board and tested for continuity and functionality. Results shows that the constructed device performed according to the design specifications, with an automatic increase in fan speed due to temperature increase and decreasing fan speed as the temperature falls with a smooth switching action. The recording output of the temperature sensor against the tachometer yielded a linear relationship which indicates the sensitivity of the device. The speed control can provide comfort to both domestic and industrial users especially when the temperature is considerably high and at night when the user is asleep.