Simple analog input to serial output conversion

analogInputToSerialOutput.ino

/*HCHOtest1.0.ino
  Barebones sketch to read an analog voltage between 0 and 100mV.
  An internal reference voltage of 1.1v is used to scale the digital conversion.
  The maximum output of the HCHO sensor (typically 100mV) is converted to a value of 103.
  This value of 103 should equal a reading of 1000ppb HCHO.
  If the maximum output of the sensor is greater than 100mV, a reading of greater than 1000ppb is posible.
*/

int analogPin = 3;          // Tip of output HCHO sensor jack connected to analog pin 3
// Ring of HCHO sensor connector connected to GND
int adcRaw;            // variable to store the sensor value read
float voltRaw;
int ppbHCHO;            // variable to store a result

void setup()
{
  analogReference(INTERNAL);       // Set analog reference to 1.1 volts
  Serial.begin(9600);              //  setup serial
}

void loop()
{
  // read the input pin
  //  adcRaw = analogRead(analogPin);
  //Generate Random Value for Testing
  adcRaw = random(0,1023);
  voltRaw = adcRaw * (1.01 / 1023.0);   //this should be the actual output voltage of the sensor
  //   ppbHCHO = voltRaw*10;                                  // scale the result between 0 and 1023
  // Print to serial monitor
  Serial.print(millis());
  //NOTE: "\t" prints a tab character, if you want a TAB Seperated Values File with a timestamp from Coolterm.
  //Otherwise use "," for a CSV, which has broader compatibility. 
  Serial.print("\t");
  Serial.print(adcRaw);                               // this is the conversion of the analog voltage to a digital number
  Serial.print("\t");
  Serial.println(voltRaw);                               // This might approximate ppb
  delay(3000);                                           // take a reading and print to the serial monitor every 3 seconds
}