TEMPERATURE SENSOR LM35: To achieve the task mentioned above, we are going to use temp.We are going to utilize DHT11 sensor and arduino for this project.
Overview The beauty of microcontrollers is that, we get very precise control over the peripherals which are connected to it. In this project the user just need to input the threshold temperature in the program, the microcontroller will take care of rest of the function. There are tons of non-microcontroller based automatic temperature controller projects available around the internet, such as using comparator and transistors. They are very simple and they do work well but, the problem arises while calibrating the threshold level using preset resistor or potentiometer. Automatic Temperature Controlled Fan Using Arduino To Sort Trial And ErrorWe have a blind idea while calibrating it and the user may need to do trial and error method to find the sweet spot. These problems are overcome by microcontrollers, the user just need to enter the temperature in Celsius in this project, so no need for calibration. This project can be used where internal temperature of circuit need to be stabilized or saving it from overheating. ![]() When the temperature goes below threshold temperature fan turns off. In diagram 2, we connected a relay for controlling devices which runs on mains voltage such as table fan. When the room temperature reaches the threshold temperature the fan turns on and turns off when the room cools down. This may be the best way for saving power and this can be heaven for lazy people who wish others to switch the fan ON when they feel warm. Circuit Diagram Showing a DC Fan Control This setup may be deployed for circuits which are enclosed in a box. The LED turns ON when the preset threshold level reached and also turns ON the fan. ![]() This circuit can control a table fan or ceiling fan or any other gadget which can cool down the ambient temperature. ![]() The temperature controlled dc fan circuit diagram illustrated here are just few of many possibilities. You may customize the circuit and program for your own purpose. NOTE 2: This program is only compatible with DHT11 sensor only. Second Design 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. This automatic processing is done through an Arduino and a temperature sensor IC LM35. As soon as temperature of the surrounding increases beyond 25 degree Celsius (you can change this value in program according to your need, explained in working section) motor starts running. And with each degree of rise in temperature, speed of motor also increases. Motor run at its top speed as soon as temperature rises to 40 degree Celsius ( this value can be changed in program).
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