/* Arduino Projects for Dummies
 * by Brock Craft 
 *
 * Chapter 11: Building a Tweeting Pet Door
 * A system that uses hall effect sensors to 
 * detect the movement of a pet flap and then
 * posts a message to your (or your pet's) twitter account
 *
 * Use this code to test and calibrate your Hall Effect sensors
 * without posting a tweet
 *
 * v0.1 30.04.2013
*/

const int entryPin = A0;   // Define the input pin for entry sensor
const int exitPin = A1;    // Define the input pin for the exit sensor
int entryReading = 0;  // Define variable to store the entry value
int exitReading = 0;   // Define variable to store the exit value

void setup() {
  Serial.begin(9600);  // Open a serial connection to display the data
}

void loop() {
  entryReading = analogRead(entryPin); // Read the value from entry sensor
  exitReading = analogRead(exitPin);   // Read the value from exit sensor
  Serial.print("Sensor values: ");   
  Serial.print(entryReading); // Print the entry sensor value
  Serial.print(", "); 
  Serial.println(exitReading); // Print the exit
  delay(500);  // Wait a moment, so we can read what's been printed
}