Listing 1. Source Code for This Project

#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into digital port 10 on the Arduino
#define ONE_WIRE_BUS 10

// Setup oneWire instance to communicate with OneWire temp device
OneWire oneWire(ONE_WIRE_BUS);

// Pass oneWire reference to Dallas Temperature
DallasTemperature sensors(&oneWire);

// Photocell input pin number
int potPin = 0;

// Declaration for photocell value
int val = 0;

// Arduino init functions
void setup(void)
{
  // Start serial port
  Serial.begin(9600);

  // Start up the library
  sensors.begin();
}

// Celsius to Fahrenheit conversion function
float c2f(float val){
  float aux = (val * 9 / 5);
  return (aux + 32);
}

// Main Arduino program loop
void loop(void)
{
  // Read photocell for light value
  val = analogRead(potPin);

  // Send command to get temperature from Dallas device
  sensors.requestTemperatures();

  // Convert returned C temp to F, print value
  Serial.print(c2f(sensors.getTempCByIndex(0)));

  // Print delimiter character in serial stream
  Serial.print("|");

  // Print (w/line feed) light-level value
  Serial.println(val);

  delay(1000);
}