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arduino-fan-speed-controlled-temperature


    arduino-fan-speed-controlled-temperature

  1. #include <LiquidCrystal.h>
  1. //source: http://www.electroschematics.com/9540/arduino-fan-speed-controlled-temperature/
  1. LiquidCrystal lcd(7,6,5,4,3,2);
  1. int tempPin = A1; // the output pin of LM35
  1. int fan = 11; // the pin where fan is
  1. int led = 8; // led pin
  1. int temp;
  1. int tempMin = 30; // the temperature to start the fan
  1. int tempMax = 70; // the maximum temperature when fan is at 100%
  1. int fanSpeed;
  1. int fanLCD;
  1.  
  1. void setup() {
  1. pinMode(fan, OUTPUT);
  1. pinMode(led, OUTPUT);
  1. pinMode(tempPin, INPUT);
  1. lcd.begin(16,2);
  1. }
  1.  
  1. void loop() {
  1. temp = readTemp(); // get the temperature
  1. if(temp < tempMin) { // if temp is lower than minimum temp
  1. fanSpeed = 0; // fan is not spinning
  1. digitalWrite(fan, LOW);
  1. }
  1. if((temp >= tempMin) && (temp <= tempMax)) { // if temperature is higher than minimum temp
  1. fanSpeed = map(temp, tempMin, tempMax, 32, 255); // the actual speed of fan
  1. fanLCD = map(temp, tempMin, tempMax, 0, 100); // speed of fan to display on LCD
  1. analogWrite(fan, fanSpeed); // spin the fan at the fanSpeed speed
  1. }
  1. if(temp > tempMax) { // if temp is higher than tempMax
  1. digitalWrite(led, HIGH); // turn on led
  1. } else { // else turn of led
  1. digitalWrite(led, LOW);
  1. }
  1. lcd.print("TEMP: ");
  1. lcd.print(temp); // display the temperature
  1. lcd.print("C ");
  1. lcd.setCursor(0,1); // move cursor to next line
  1. lcd.print("FANS: ");
  1. lcd.print(fanLCD); // display the fan speed
  1. lcd.print("%");
  1. delay(200);
  1. lcd.clear();
  1. }
  1.  
  1. int readTemp() { // get the temperature and convert it to celsius
  1. temp = analogRead(tempPin);
  1. return temp * 0.48828125;
  1. }

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