SpeedFan is able to control the fan speed of most fan makes and models, but this will ultimately depend on your motherboard's sensor chip and capabilities. Can SpeedFan control the fan speed of any fan?

It can be used in cooling electronics devices, where the fan speed needs to increase if here dissipation increases.SpeedFan is a hardware monitor software that can access temperature sensors, but its main feature is that it can control fan speeds - depending on the capabilities of your sensor chip and your hardware - according to the temperatures inside your PC, thus reducing noise and power consumption. When heat is applied to the temperature sensor, this will determine the fan automatically increasing or decreasing in speed according to the four speed levels of a normal fan that are set to different temperature ranges of a room.

Here pulse width modulation is use in this case. Therefore we use amplifier to increase the strength of the signal so that the signal is able to drive the output section, in this case a fan. As the signal sensed by the temperature sensor is very weak in amplitude and strength. The heart of this project consists of the temperature sensor circuit which senses the change in the ambient temperature of the surroundings. The temperature flow controlled fan is an automated fan, controlled by a temperature sensor, using fully hardware design. The research paper presented here is based on automatic fan speed controller that automatically adjusts the fan's speed according to ambient temperature of the surroundings.

Temperature fan controller