Temperature LED Alert and Fan Activation with Arduino

This project determines the temperature using an Analog Temperature Sensor and then turns on LED warning lights, and exhaust fans.

Functional Parts in the Project:

• Arduino Uno – https://store.arduino.cc/usa/arduino-uno-rev3
• L298N Motor Module – https://amzn.to/2Xa9uiR
• 200mm 12v Fan – https://amzn.to/2X40nQt
• Analog Temperature Sensor – https://amzn.to/2Rkkl3k
• 220 Ohm Resistors – https://amzn.to/2RiiMD9
• Breadboard Kit – https://amzn.to/2Xih5ei
• LED Kit – https://amzn.to/2Rjhs2N
• 560 Piece Jumper Wire Kit – https://amzn.to/2MsCLjL

#define tempSensor A0

#define greenLED 2
#define yellowLED 3
#define redLED 4

#define enA 6
#define enB 7

#define in1 8
#define in2 9

#define in3 10
#define in4 11

int goodTemp = 73;
int highTemp = 80;

void setup()
{
  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);

  analogWrite(enA, 255);
  analogWrite(enB, 255);

  Serial.begin(9600);
}

void loop()
{

  int reading = analogRead(tempSensor);
  float voltage = reading * 5.0;
  voltage /= 1024.0;
  float temperatureC = (voltage - 0.5) * 100 ;
  float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0;

  Serial.print(voltage); Serial.print(" volts  -  ");
  Serial.print(temperatureC); Serial.print(" degrees C  -  ");
  Serial.print(temperatureF); Serial.println(" degrees F");


  if (temperatureF >= highTemp) {
    digitalWrite(redLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, LOW);
    digitalWrite(in1, HIGH);
    digitalWrite(in2, LOW);
    digitalWrite(in3, HIGH);
    digitalWrite(in4, LOW);
  }

  else if (temperatureF >= goodTemp && temperatureF < highTemp) {
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(greenLED, LOW);
    digitalWrite(in1, HIGH);
    digitalWrite(in2, LOW);
    digitalWrite(in3, LOW);
    digitalWrite(in4, LOW);
  }

  else {
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, HIGH);
    digitalWrite(in1, LOW);
    digitalWrite(in2, LOW);
    digitalWrite(in3, LOW);
    digitalWrite(in4, LOW);
  }

  delay(1000);

}