Temperature Fan Speed Controller Circuit

It works on the principle of thermistor.

Temperature fan speed controller circuit.

The hotter the temp the faster fan speed. This change is reflected on the fan speed by regulating the current to the fan s motor. The temperature sensor output is read by the arduino and the software establishes the desired fan speed for a. My temperature controlled fan circuit has a liquid crystal display connected to the arduino to display the temperature in celsius and fan speed 50 255 pwm this controls the duty cycle of the fan which then controls the fan speed.

I use very minimal parts and works in real life. Working of temperature controlled dc fan using thermistor. Maxim s fan controller ics accurately monitor and control fan speed and offer additional benefits such as temperature sensing voltage monitoring and gpios. Two thermistors r1 and r2 are used to sense the temperature.

The max6625 can be connected to the same i c compatible bus to monitor temperature. The circuit principle is a voltage divider between t1 and 20 k potentiometer. Accurate fan speed control enhances overall system performance in applications such as servers telecom networking and video projectors. Today i will show you how to make a very simple temperature control fan speed circuit.

In this circuit pin 3 non inverting terminal of op amp 741 is connected with the potentiometer and pin 2 inverting terminal is connected in between of r2 and rt1 thermistor which is making a voltage divider circuit. The max6650 can work as a fan speed controller or a fan speed regulator. As the temperature increases so does the speed of the fan motor and vice versa. This fan speed controller works by sensing the temperature of the engine and is accordingly used for the triggering.

This circuit change 12 volts dc fan speed by temperature. Arduino is at the heart of the circuit as it controls all functions. Lm35 is a precision integrated circuit whose output voltage is linearly proportional to celsius centigrade temperature. Here two thermistors are used to measure the room temperature.

The max6650 interfaces to fans with tachometer outputs to monitor and control fan speed. Simplest 12v cooling fan controller with temperature status using thermistor temperature sensor ntc mf52 103 thermistor nec d882 tp 120 and tl431 transist.