![]() ![]() If(DHT.temperature>=th) digitalWrite(op,HIGH) ![]() you may remove these lines after testing, from here Serial.begin(9600) // May be removed after testing Int th = 30 // set thershold tempertaure in Celsius Program for the above explained automatic temperature regulator circuit using Arduino: NOTE 2: This program is only compatible with DHT11 sensor only. You may customize the circuit and program for your own purpose. The temperature controlled dc fan circuit diagram illustrated here are just few of many possibilities. The connected device turns off as soon as the temperature reached below preset threshold level. This circuit can control a table fan or ceiling fan or any other gadget which can cool down the ambient temperature. This circuit does the similar function of previous circuit, now the fan is replaced by relay. The LED turns ON when the preset threshold level reached and also turns ON the fan.Ĭonnecting a Relay for Controlling Bigger Fans This setup may be deployed for circuits which are enclosed in a box. 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. When the room temperature reaches the threshold temperature the fan turns on and turns off when the room cools down. In diagram 2, we connected a relay for controlling devices which runs on mains voltage such as table fan. When the temperature goes below threshold temperature fan turns off. When the threshold temperature is reached the fan turns on. This setup can be used to control the internal ambient temperature of an enclosed circuit. In diagram 1, we are connecting a CPU fan as output. ![]() This project can be used where internal temperature of circuit need to be stabilized or saving it from overheating. These problems are overcome by microcontrollers, the user just need to enter the temperature in Celsius in this project, so no need for calibration. #Temperature controlled fan arduino trial#We have a blind idea while calibrating it and the user may need to do trial and error method to find the sweet spot. They are very simple and they do work well but, the problem arises while calibrating the threshold level using preset resistor or potentiometer. There are tons of non-microcontroller based automatic temperature controller projects available around the internet, such as using comparator and transistors. 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. The beauty of microcontrollers is that, we get very precise control over the peripherals which are connected to it. WHY ARDUINO FOR THIS DC FAN CONTROLLER PROJECT?.Circuit Diagram Showing a DC Fan Control. ![]()
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