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/*

Camera Shield Example

This example shows an application on 1Sheeld's camera shield.

By using this example, you can take a photo using your phone's
camera if the light sensor reads data above a certain threshold.

*/

/* Include 1Sheeld library. */ 
#include <OneSheeld.h>

const int trigPin = 2;
const int echoPin = 4;


void setup()
{
  /* Start communication. */
  OneSheeld.begin();
}

void loop()
{
  
  // establish variables for duration of the ping, 
  // and the distance result in inches and centimeters:
  long duration, cm;

  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  pinMode(trigPin, OUTPUT);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
    // Read the signal from the sensor: a HIGH pulse whose
  // duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);
  
 // convert the time into a distance
  
  cm = microsecondsToCentimeters(duration);
  
  /* Always get the value of the light sensor and make sure it is in a certain range. */
  if(cm < 100 && cm > 30)
  {
    Terminal.println("Photo will be taken");
    /* Turn on the camera's flash while capturing. */
    Camera.setFlash(ON);
    /* Take a photo using the phone's rear camera. */
    Camera.rearCapture();
    /* Delay for 5 seconds. */
    String status = "status to be written to facebook along the picture";
    Twitter.tweetLastPicture(status , 0/1);

  }
   delay(100);
}

long microsecondsToCentimeters(long microseconds)
{
  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.
  return microseconds / 29 / 2;
}