Dc Fan Temperature Control

Circuit components arduino uno.

Dc fan temperature control. Here is a simple circuit based on two transistors that can be used to control the speed of a 12 v dc fan depending on the temperature a thermistor r1 is used to sense the temperature. Can be extended to pwm based output where the speed of the fan can be varied according to the duty cycle of the pwm signal. Temperature controlled dc fan description. The aim of this project is to automatically turn on or off the fan by detecting the surrounding temperature.

The smartfan wisp is a temperature based fan speed control and temperature alarm circuit contained in a 1 2 d x 3 l probe that can be mounted in the exhaust or inlet of any heat producing equipment. The block diagram of the temperature controlled fan using a microcontroller is shown in the above figure. Working of temperature controlled dc fan using thermistor. The second temperature controlled dc fan circuit project discussed below automatically senses the ambient temperature and adjusts the fan motor speed to keep the surrounding temperature under control.

By monitoring the temperature. 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. In this project we have implemented a simple temperature control system using simple components. Temperature controlled dc fan.

For controlling multiple fans low air volume applications or unusual fan types the wisp is a cost effective choice. Temperature controlled dc fan can be used to control the temperature of devices rooms electronic components etc. It works on the principle of thermistor. In the program we have set four different conditions to run the dc fan.

Dc fan remains off in this condition. It can drive 2 dc motors and we can also control the speed by providing pwm signals. A small brush less dc fan one used in computers turns on to increase the air circulation. The circuit can be used in cpu to reduce the heat.

If the temperature is between 25 c and 30 c then the dc fan will start. It is accomplished by the data communications between arduino lcd dht11 sensor module and dc fan that is controlled by using pwm. In order to implement a temperature control system we need a temperature sensor a controller and a cooling system. In this arduino based project we are going to control dc fan speed according to the room temperature and show these parameter changes on a 16x2 lcd display.

The block diagram includes power supply rst circuit 8051 microcontrollers lm35 temperature sensor 8 bit adc l293d motor driver dc motor 7 segment display i p switches. Pwm is a technique by using which we can control voltage. This automatic processing is done through an arduino and a temperature sensor ic lm35.