/*
Arduino code for ECE 44X Group 3: electrical arc speaker
Author: Aaron Bicks
*/
const int thermInOne = A0, thermInTwo = A1, thermInThree = A2;  //analog input for 3 sensors
const int max_temp = 80;  //maximum temperature allowed
const int relayOut = 9;   //voltage output to relay
const int power = 10;
int count = 0;
int avg_TempC, avg_TempF;
bool flip = true;
bool closed = true;

void setup() {
  //initialize pins for input
  pinMode(thermInOne, INPUT);
  pinMode(thermInTwo, INPUT);
  pinMode(thermInThree, INPUT);

  Serial.begin(9600);
  
 // initialize relay
  analogWrite(relayOut, 255);

 //turn on power pin
  analogWrite(power, 255);
}

void loop() {
  float tempC;
  float tempF;
 
  //initialize average temperatures to 0
  avg_TempC = 0;
  avg_TempF = 0; 

  //input and process data from sensor 1
  tempC = sensorOne();
  avg_TempC += tempC;
  tempF = convertToF(tempC);
  avg_TempF += tempF;

  if (tempC > max_temp)
    shutdownHeat();

  Serial.println(tempC);
  Serial.println(tempF);
    
  //input and process data from sensor 2
  tempC = sensorTwo();
  avg_TempC += tempC;
  tempF = convertToF(tempC);
  avg_TempF += tempF;

  Serial.println(tempC);
  Serial.println(tempF);
  if (tempC > max_temp)
    shutdownHeat();

  //input and process data from sensor 3
  tempC = sensorThree();
  avg_TempC += tempC;
  tempF = convertToF(tempC);
  avg_TempF += tempF;
  Serial.println(tempC);
  Serial.println(tempF);

  if (tempC > max_temp)
    shutdownHeat();
Serial.println();
delay(3000);
}

//take input from sensor 1
float sensorOne(){
  
  float Vin = analogRead(thermInOne);
  float voltage = Vin * 5.0;
  voltage /= 1024.0;
  float temperature = (voltage-0.5) * 100;

  return temperature;
}

//take input from sensor 2
float sensorTwo(){

  float Vin = analogRead(thermInTwo);
  float voltage = Vin * 5.0;
  voltage /= 1024.0;
  float temperature = (voltage-0.5) * 100;

  return temperature;
}

//take input from sensor 3
float sensorThree(){

  float Vin = analogRead(thermInThree);
  float voltage = Vin * 5.0;
  voltage /= 1024.0;
  float temperature = (voltage-0.5) * 100;

  return temperature;
}

//takes a celcius temperature and converts it to fareinheit
float convertToF(float x){
  float temperature = (x * 9.0 / 5.0) + 32.0;
  return temperature;
}

void shutdownHeat(){
  float tempOne;
  float tempTwo;
  float tempThree;
  //shut down system
  analogWrite(relayOut, 0);
  //Serial.println("Overheat");

  //monitor temperature until it cools down
  while(tempOne >= max_temp || tempTwo >= max_temp || tempThree >= max_temp){
    tempOne = sensorOne();
    tempTwo = sensorTwo();
    tempThree = sensorThree();
    Serial.println("Overheat");
    Serial.println(tempOne);
    Serial.println(tempTwo);
    Serial.println(tempThree);
    Serial.println();
    delay(1000);
  }
 
  //restart system
  analogWrite(relayOut, 255);
  delay(1000);
}