Active Sensor Thermometer

/*

   The value of Vout is obtained by averaging 1024 values reading the voltage on pin A0. whicch is connected to the sensor output. The value of temeprature ta, read by the sensor is shown on the serial monitor.

*/


// set pin numbers:

const int in = A0;            // input for reading the sensor output

// set constants:
const float vout0 = 400;   //  sensor output voltage in mV at 0°C
const float tc = 19.53;   // mV for °C temperature constant for the  MCP9701/A

// variables:

int i, f;
float vout, vout_avg, ta;


// MAIN PROGRAM

void setup() {
  Serial.begin(9600);
  pinMode(in, INPUT);            // set pin in as input
  pinMode(13, OUTPUT);            // set pin 13 as output
  digitalWrite(13, LOW);
  analogReference(DEFAULT);
 
}

void loop() {
  vout_avg = 0;
  for (i = 0; i < 1024; i++) {
    vout = analogRead(A0) * (4976.30 / 1023);
    //Serial.println(vout);
    vout_avg = vout_avg + vout;
  }
  vout = vout_avg / 1024;
  //Serial.println(vout);
  ta = (vout - vout0) / tc;
  Serial.print("temperature ( celcius degree)   = " );
  Serial.println(ta);
  delay (1000);
}