Automatic Temperature Controlled Fan Using Arduino

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Aurdino based Temperature Controlled Fan - In this project, we are going to control DC fan speed according to the room temperature and show these parameter changes on a 16x2 LCD display. It is accomplished by data communications between Aurdino, LCD, DHT11 sensor module and DC Fan that is Controlled by using PWM. PWM is a technique by using which we can Control Voltage. This project consists of three sections as, One senses the temperature by using humidity and temperature sensor namely DHT11. Second section reads the dht11 sensor module’s output and extracts temperature value into a suitable number in Celsius scale and control the fan speed by using PWM. And last part of system shows humidity and temperature on LCD and Fan driver. Here in this project we have used a sensor module namely DHT11 that are already been discussed.

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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 16×2 LCD display. It is accomplished by the data communications between Arduino, LCD, DHT11 sensor Module and DC fan that is controlled by using PWM.

Here we have only used this DHT sensor for sensing temperature, and then programmed our arduino according to the requirements. Working of this project is very simple.

We have created PWM at pwm pin of arduino and applied it at base terminal of transistor. Then transistor creates a voltage according to the pwm input.