unsigned int time = 0; // profile seconds
unsigned int degrees = 25; // actual oven temp

unsigned int Ts_max = 200; // °C
unsigned int Ts_min = 150; // °C
unsigned int Tp = 260; // 245-260°C
unsigned int rampup_rate = 3; // 3°C/s
unsigned int preheat_duration = 100; // 60-180s
unsigned int tal = 217; // 217°C
unsigned int tal_duration = 100; // 60-150s
unsigned int peak_duration = 30; // 20-40s
unsigned int rampdown_max = 6; // 6°C/s max
unsigned int time_max = 480; // 8*60s max

byte state; // 0 = start, 1 = preheat, 2 = tal, 3 = max, 4 = rampdown

void setup() {
  pinMode(13, OUTPUT);
  Serial.begin(9600);
}

void get_temp() {
}

void loop() {
  time = millis() / 1000;

  // wait a second so as not to send massive amounts of data
  delay(1000);

  switch (state) {
      case 0:
          if (degrees > Ts_min) {
              state++;
          }
      case 1:
          break;
      case 2:
        break;
      case 3:
        break;
      case 4:
        break;
      default:
        break;
  }

  if (degrees > 60) {
    Serial.print("seconds: ");
    Serial.println(time);
  }
}