/* Sensor test sketch
  for more information see http://www.ladyada.net/make/logshield/lighttemp.html
  */

#define aref_voltage 3.3         // we tie 3.3V to ARef and measure it with a multimeter!




//TMP36 Pin Variables
int tempPin = A0;        //the analog pin the TMP36's Vout (sense) pin is connected to
                        //the resolution is 10 mV / degree centigrade with a
                        //500 mV offset to allow for negative temperatures
unsigned long tempReading;        // the analog reading from the sensor

bool flag = 0;  // For telling if we were on or off before

void setup(void) {
  // We'll send debugging information via the Serial monitor
  Serial.begin(115200);
  pinMode(2, OUTPUT);

  // If you want to set the aref to something other than 5v
  analogReference(EXTERNAL);
}


void loop(void) {
  tempReading = 0;

  for(int  i = 0; i < 1000; i++){
    tempReading += analogRead(tempPin);
  }

  tempReading /= 1000; // Average a few reads.

  // converting that reading to voltage, which is based off the reference voltage
  float voltage = tempReading * aref_voltage;
  voltage /= 1024.0;

  // now print out the temperature
  float temperatureC = (voltage - 0.5) * 100 ;  //converting from 10 mv per degree wit 500 mV offset
                                               //to degrees ((volatge - 500mV) times 100)
  // now convert to Fahrenheight
  float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0;
  Serial.println(temperatureF);

  if (temperatureF > 95) {
    digitalWrite(2, HIGH);
    if (flag == 0){
      flag = 1;
      Serial.println("fan_turned_on");
    }
  } else if (temperatureF < 90) {
    digitalWrite(2, LOW);
    if (flag == 1){
      flag = 0;
      Serial.println("fan_turned_off");
    }
  }

  delay(5000);
}