Temperature Fan Speed Controller Circuit

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.

Temperature fan speed controller circuit.

Simplest 12v cooling fan controller with temperature status using thermistor temperature sensor ntc mf52 103 thermistor nec d882 tp 120 and tl431 transist. Arduino is at the heart of the circuit as it controls all functions. I use very minimal parts and works in real life. The max6650 interfaces to fans with tachometer outputs to monitor and control fan speed.

Accurate fan speed control enhances overall system performance in applications such as servers telecom networking and video projectors. This change is reflected on the fan speed by regulating the current to the fan s motor. This fan speed controller works by sensing the temperature of the engine and is accordingly used for the triggering. The difference is a subtle but important one.

Today i will show you how to make a very simple temperature control fan speed circuit. The temperature sensor output is read by the arduino and the software establishes the desired fan speed for a. Lm35 is a precision integrated circuit whose output voltage is linearly proportional to celsius centigrade temperature. It works on the principle of thermistor.

As the temperature increases so does the speed of the fan motor and vice versa. Working of temperature controlled dc fan using thermistor. This circuit change 12 volts dc fan speed by temperature. This fan regulator circuit will automatically control the speed of your fan according to the temperature.

Here two thermistors are used to measure the room temperature. The max6625 can be connected to the same i c compatible bus to monitor temperature. Two thermistors r1 and r2 are used to sense the temperature. The max6650 can work as a fan speed controller or a fan speed regulator.

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 hotter the temp the faster fan speed.