#define THERMISTORPIN A0   
#define THERMISTORPIN2 A1      
#define THERMISTORNOMINAL 10000      
#define TEMPERATURENOMINAL 25   
#define NUMSAMPLES 5
#define BCOEFFICIENT 3950
#define SERIESRESISTOR 10000    

int samples[NUMSAMPLES];
int samples2[NUMSAMPLES];
unsigned long hairdryerStartMillis;
unsigned long tempStartMillis;
unsigned long currentMillis;
const unsigned long onDuration = 2000;
const unsigned long offDuration = 4000;
const unsigned long periodTemp = 1000;

void setup() {
  Serial.begin(9600);
  pinMode(2, OUTPUT);
  analogReference(EXTERNAL);
  hairdryerStartMillis = millis();
  tempStartMillis = millis();

}

void loop() {
 currentMillis = millis();
 hairdryerToggle();
 temperatureReadings();
}

void temperatureReadings(){
    if (currentMillis - tempStartMillis >= periodTemp) {
  uint8_t i;
  float average;
  float average2;

  // take N samples in a row, with a slight delay
  for (i=0; i< NUMSAMPLES; i++) {
   samples[i] = analogRead(THERMISTORPIN);
   samples2[i] = analogRead(THERMISTORPIN2);
   delay(10);
  }
  
  // average all the samples out
  average = 0;
  average2 = 0;
  for (i=0; i< NUMSAMPLES; i++) {
     average += samples[i];
     average2 += samples2[i];
  }
  average /= NUMSAMPLES;
  average2 /= NUMSAMPLES;

  //Serial.print("Average analog reading "); 
  //Serial.println(average);
  
  // convert the value to resistance
  average = 1023 / average - 1;
  average = SERIESRESISTOR / average;
  
  average2 = 1023 / average2 - 1;
  average2 = SERIESRESISTOR / average2;
  //Serial.print("Thermistor resistance "); 
 // Serial.println(average);
  
  float steinhart;
  steinhart = average / THERMISTORNOMINAL;     // (R/Ro)
  steinhart = log(steinhart);                  // ln(R/Ro)
  steinhart /= BCOEFFICIENT;                   // 1/B * ln(R/Ro)
  steinhart += 1.0 / (TEMPERATURENOMINAL + 273.15); // + (1/To)
  steinhart = 1.0 / steinhart;                 // Invert
  steinhart -= 273.15;                         // convert absolute temp to C
  
  float steinhart2;
  steinhart2 = average2 / THERMISTORNOMINAL;     // (R/Ro)
  steinhart2 = log(steinhart2);                  // ln(R/Ro)
  steinhart2 /= BCOEFFICIENT;                   // 1/B * ln(R/Ro)
  steinhart2 += 1.0 / (TEMPERATURENOMINAL + 273.15); // + (1/To)
  steinhart2 = 1.0 / steinhart2;                 // Invert
  steinhart2 -= 273.15;                         // convert absolute temp to C

  Serial.print("Temperature 1 "); 
  Serial.print(steinhart);
  Serial.println(" *C");

  Serial.print("Temperature 2 "); 
  Serial.print(steinhart2);
  Serial.println(" *C");
  
  tempStartMillis = currentMillis;
 }
}


void hairdryerToggle() {
   if (digitalRead(2) == HIGH) {
      if(currentMillis - hairdryerStartMillis >= onDuration) {
        hairdryerStartMillis += onDuration;
        digitalWrite(2, LOW);
      }
    }

   else {
      if(currentMillis - hairdryerStartMillis >= offDuration) {
        hairdryerStartMillis += offDuration;
        digitalWrite(2, HIGH);
      }
  }
}