Temperature Controlled Fan using Arduino

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Automatic Temperature Controlled Fan Project using Arduino


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. It is accomplished by the data communications between Arduino, LCD, DHT11 sensor Module and DC fan that is controlled by using PWM. PWM is a technique by using which we can control voltage.

Circuit Components

1. Arduino UNO
2. DHT11 sensor
3. DC Fan
4. 2n2222 transistor
5. 9 volt battery
6. 16x2 LCD
7. 1K resistor
8. Connecting wires

This project consists of three sections. 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
have discuss our previous project namely “Humidity and Temperature Measurement using Arduino”.
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.

Circuit Description

Connections of this temperature controlled fan circuit is very simple, here a
liquid crystal display is used for displaying temperature and Fan speed Status.
LCD is directly connected to arduino in 4-bit mode (Check this tutorial for more details:
LCD Interfacing with Arduino Uno). Pins of LCD namely RS, EN, D4, D5, D6 and D7
are connected to arduino digital pin number 7, 6, 5, 4, 3 and 2. And a DHT11
sensor module is also connected to digital pin 12 of arduino. Digital pin 9 is
used for controlling fan speed trough transistor.

Code