Using this software, you … * cannot find model file 'DHTXX. En - pin 6       delay(100); Now compile the code, you won’t have any error. DHT22 sensor is used to read the temperature to control fan speed. You may have forgotten to include the LiquidCrystal.h library, please check and always use latest version of Arduino IDE.  lcd.setCursor(0,1); No need for other circuits. Temperature based Fan Speed Control . can you please send me full code of this project, The full code of this projects is already given in this page at the bottom of the explanation, Arduino: 1.8.5 (Windows Store 1.8.10.0) (Windows 10), Board: "Arduino/Genuino Uno", sketch_aug17b:34: error: request for member 'read' in '11', which is of non-class type 'int', sketch_aug17b:34: error: 'DHT11pin' was not declared in this scope, sketch_aug17b:35: error: request for member 'temperature' in '11', which is of non-class type 'int'. According to the software code fan start to rotate at 30 0 C and at 60 0 C speed of fan become 100%. Temperature Based Fan Speed Control And Monitoring Using Arduino. int temp=DHT11.temperature; Electronic fan speed controllers allow you to regulate the rotational speed of AC fans manually or demand based. Easy Temperature Based Control, 29. This design can be expand in terms of power at layout and being characterized level by advanced VLSI application. 2.       lcd.print("Fan Speed: 100%   "); The temperature and fan speed …       analogWrite(9,0);     }  lcd.print("Circuit Digest "); Just wanted to know how many identical items can I connect to this PWM ? First I had a bunch of error on arduino, dht errors. 1.                 0b00000, Proteus 8 supports the DHT library, no need to add. #include Suppose we have a pule with duty cycle 50% that means it will give half of voltage that we apply. 0b00000,  delay(2000); Then go inside “libraries” subfolder.   lcd.setCursor(0,0); Speed control of fan based on room temperature by using programmable logic Controller (PLC) The design of speed control of fans based on room temperature using PLC technique. byte degree[8] = D7 - pin 2. and and Can I use a thermistor instead of dht11? An Android app-controlled, Arduino-based kit that receives and analyzes humidity and temperature data.                 0b00000, I did all my connections correct but not printing and not able to control. Mean if PWM value is equivalent of analog value. I’ve found this solution on : https://arduino.stackexchange.com/questions/44898/dht-h-library-not-being-imported. AC Infinity AIRLIFT T10, Shutter Exhaust Fan 10-inch with Temperature Humidity Controller - Wall Mount Ventilation and Cooling for Sheds, Attics, Workshops 4.7 out of 5 stars 269 $129.00 $ 129 . Then transistor creates a voltage according to the PWM input. This concept is used in the project to control the voltage using PWM. Arduino: 1.8.5 (Mac OS X), Board: "Arduino/Genuino Uno", In file included from /Users/DanyaalT/Documents/Arduino/libraries/DHT-sensor-library-master/DHT_U.cpp:22:0: Can I connect all 3 to the same PWM circuit ? Control the speed of brushless DC motor using Arduino and Bluetooth module (HC-05).       delay(100); The key component of this temperature controlled fan circuit is Thermistor, which has been used to detect the rise in temperature.Thermistor is temperature sensitive resistor, whose resistance changes according to the temperature.There are two types of thermistor NTC (Negative Temperature Co-efficient) and PTC (Positive Temperature Co-efficient), we are using a NTC …   if(temp <26 ) Any suggestions for a solution? DHT.read11(dht_dpin); exit status 1 One last thing : Connect 2N2222 transistor properly. So it can save and streamline the work that is usually done manually which could then work automatically and effective for humans. 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