int led = D0;
int boardLed = D7;
int photoresistor = A0;
int power = A5;
int intactValue;
int brokenValue;
int beamThreshold;
bool beamBroken = false;

void setup() {

  pinMode(led,OUTPUT);
  pinMode(boardLed,OUTPUT);
  pinMode(photoresistor,INPUT);
  pinMode(power,OUTPUT); //

  digitalWrite(power,HIGH);

  digitalWrite(boardLed,HIGH);
  delay(2000);

  digitalWrite(boardLed,LOW);
  digitalWrite(led,HIGH);
  delay(500);

  int on_1 = analogRead(photoresistor);
  delay(200);
  int on_2 = analogRead(photoresistor);
  delay(300);

  digitalWrite(boardLed,HIGH);
  delay(100);
  digitalWrite(boardLed,LOW);
  delay(100);
  digitalWrite(boardLed,HIGH);
  delay(100);
  digitalWrite(boardLed,LOW);
  delay(100);

  digitalWrite(boardLed,HIGH);
  delay(2000);

  digitalWrite(boardLed,LOW);

  int off_1 = analogRead(photoresistor);
  delay(200);
  int off_2 = analogRead(photoresistor);
  delay(1000);
  digitalWrite(boardLed,HIGH);
  delay(100);
  digitalWrite(boardLed,LOW);
  delay(100);
  digitalWrite(boardLed,HIGH);
  delay(100);
  digitalWrite(boardLed,LOW);
  delay(100);
  digitalWrite(boardLed,HIGH);
  delay(100);
  digitalWrite(boardLed,LOW);

  intactValue = (on_1+on_2)/2;
  brokenValue = (off_1+off_2)/2;

  beamThreshold = (intactValue+brokenValue)/2;
}
void loop() {

  if (analogRead(photoresistor)>beamThreshold) {

    if (beamBroken==true) {

        Spark.publish("beamStatus","intact",60,PRIVATE);

        digitalWrite(boardLed,HIGH);
        delay(500);
        digitalWrite(boardLed,LOW);

        beamBroken=false;
    }
    else {

    }
  }
  else {

      if (beamBroken==false) {

        Spark.publish("beamStatus","broken",60,PRIVATE);

        digitalWrite(boardLed,HIGH);
        delay(500);
        digitalWrite(boardLed,LOW);

        beamBroken=true;
      }
      else {
          
      }
  }
}