Over the last decade, advances in electronics have
made devices smaller, cheaper and faster. This project is about
how the speed of a fan can be controlled, based on temperature
sensor. It is also a part of smart home application where the 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 regulating the fan
speed which acts to our agony.
So as to reduce this extra effort
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 circuit slightly, 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 automatically when the
device’s temperature varies. Experiment can be followed to
evaluate whether this circuit can save energy through the use of
temperature sensor and thus promote efficiency.
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