Temperature controlled Fan using Arduino

Components using:-

Arduino uno

LM35

LCD 16x2

DC Motor With Blade

Circuit

Code:-

 #include<LiquidCrystal.h>

 LiquidCrystal lcd(12,11,5,4,3,2);

 int val;

int tempPin = A0;

int fan=7 ;

void setup()

{

  lcd.begin(16,2);

Serial.begin(9600);

pinMode(fan,OUTPUT);

digitalWrite(fan,LOW);

lcd.setCursor(0,0);

  lcd.print("Welcome in");

  lcd.setCursor(0,2);

  lcd.print("Technical Hut");

  delay(2000);

  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("Temp controlled");

  lcd.setCursor(0,2);

  lcd.print("cooling System");

  delay(2000);

  lcd.clear();

}

void loop()

{

  

  

val = analogRead(tempPin);

float mv = ( val/1024.0)*5000; 

float cel = mv/10;

lcd.setCursor(0,0);

lcd.print("TEMPRATURE = ");

lcd.print(cel);

lcd.setCursor(0,2);

lcd.print("*C");

delay(1000);

if(cel>40)

{

  digitalWrite(fan,HIGH);

}

else

{ digitalWrite(fan,LOW);

}

}

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