/*
2CH Temperature Measure

Connection
CH1 5V-(Thermistor 103AT-11)-A0-470 OHM-GND
CH2 5V-(Thermistor 103AT-11)-A6-470 OHM-GND

*/

int sensorPin1 = A0;    // select the input pin for the potentiometer
int sensorPin2 = A6;    // select the input pin for the potentiometer

int ledPin = 13;      // select the pin for the LED
double sensorValue1 = 0;  // variable to store the value coming from the sensor
double sensorValue2 = 0;  // variable to store the value coming from the sensor

long iMax=10000;
double Temp1=0;
double Temp2=0;

long RepetitinTime=20000; //Every 20000 msec=20 sec 


void setup() {
  // declare the ledPin as an OUTPUT:
  pinMode(ledPin, OUTPUT);
  analogReference(DEFAULT);
  Serial.begin(9600);
}

void loop() {

  sensorValue1=0;
  sensorValue2=0;

       iMax=0;
   while(  (millis()%RepetitinTime)<(RepetitinTime-10)){
      iMax=iMax+1;
  sensorValue1 =  sensorValue1+ analogRead(sensorPin1);
  sensorValue2 =  sensorValue2+ analogRead(sensorPin2);
   }
   delay(10);
 Temp1=1/(0.003356+0.0002911*log((48.0810*iMax/sensorValue1)-0.0470))-273.15;//Temp1 measure
 Temp2=1/(0.003356+0.0002911*log((48.0810*iMax/sensorValue2)-0.0470))-273.15;//Temp2 measure
 
 Serial.print(millis()/1000);
 Serial.print(" sec / ");
 Serial.print(Temp1);
 Serial.print(" C/ ");
 Serial.print(Temp2);
 Serial.println(" C");
 
}