const int red = 2;
const int green = 1;
const int blue = 0;
const int sensor = 3;
const int del = 75; //minimum time for changes to take place

void setup() {
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(sensor, INPUT);
}

void loop() {               
  double temperature;
  temperature = getTemp(analogRead(sensor)); 
  
  if (temperature <= 70) { makeBlue(); }
  
  else if (temperature > 70 && temperature <= 79) { makeAqua(); }
  
  else if (temperature > 79 && temperature <= 88) { makeGreen(); }
  
  else if (temperature > 88 && temperature <= 97) { makeYellow(); }
  
  else if (temperature > 97 && temperature <= 106) { makeOrange(); }
  
  else if (temperature > 106 && temperature <= 115) { makeRed(); }
  
  else { flashRed(100); }
}

double getTemp(int RawADC) {
 double Temp;
 Temp = log(10000.0*((1024.0/RawADC-1))); 
 Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
 Temp = Temp - 273.15;          
 Temp = (Temp * 9.0)/ 5.0 + 32.0; 
 return Temp;
}

void makeRed() {
  digitalWrite(red, HIGH);
  digitalWrite(green, LOW);
  digitalWrite(blue, LOW);
  delay(del);
}

void makeGreen() {
  digitalWrite(red, LOW);
  digitalWrite(green, HIGH);
  digitalWrite(blue, LOW);
  delay(del);
}

void makeBlue() {
  digitalWrite(red, LOW);
  digitalWrite(green, LOW);
  digitalWrite(blue, HIGH);
  delay(del);
}

void makeYellow() {
  digitalWrite(red, HIGH);
  digitalWrite(blue, LOW);
  long start = millis();
  long endtime = start;
  while((endtime - start) <= del)
  {
    digitalWrite(green, HIGH);
    delayMicroseconds(100);
    digitalWrite(green, LOW);
    delayMicroseconds(255);
    endtime = millis();
  }
}

void makeOrange() {
  digitalWrite(red, HIGH);
  digitalWrite(blue, LOW);
  long start = millis();
  long endtime = start;
  while((endtime - start) <= del)
  {
    digitalWrite(green, HIGH);
    delayMicroseconds(30);
    digitalWrite(green, LOW);
    delayMicroseconds(255);
    endtime = millis();
  }
}

void makeAqua() {
  digitalWrite(red, LOW);
  digitalWrite(green, HIGH);
  digitalWrite(blue, HIGH);
  delay(del);
}

void flashRed(int d) {
  digitalWrite(green, LOW);
  digitalWrite(blue, LOW);
  long start = millis();
  long endtime = start;
  while((endtime - start) <= del)
  {
    digitalWrite(red, HIGH);
    delay(d);
    digitalWrite(red, LOW);
    delay(d);
    endtime = millis();
  }
}