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/*
 * code from http://www.robodino.de/2011/12/ultraschall-distanz-sensor-hc-sr04.html
 */ 
 
#define trigPin 31
#define echoPin 33
//#define led 11
//#define led2 10
 
void setup() {
  Serial.println("Hello");
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
//  pinMode(led, OUTPUT);
//  pinMode(led2, OUTPUT);
}
 
void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trigPin, HIGH);
//  delayMicroseconds(1000); - Removed this line
  delayMicroseconds(10); // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  if (distance < 4) {  // This is where the LED On/Off happens
  //digitalWrite(led,HIGH); // When the Red condition is met, the Green LED should turn off
  //digitalWrite(led2,LOW);
}
  else {
    //digitalWrite(led,LOW);
    //digitalWrite(led2,HIGH);
  }
  if (distance >= 400 || distance <= 0){
    Serial.println("Out of range");
  }
  else {
    Serial.print(distance);
    Serial.println(" cm");
  }
  delay(1);
}

/*
 * code from http://www.arduino-hacks.com/adding-bluetooth-capability-project-arduino-hc-06/
 */
 
char blueToothVal;           //value sent over via bluetooth
char lastValue;              //stores last state of device (on/off)
 
void setup()
{
 Serial.begin(9600); 
 pinMode(13,OUTPUT);
}
 
 
void loop()
{
  if(Serial.available()>0)
  {//if there is data being recieved
    blueToothVal=Serial.read(); //read it
  }
  if (blueToothVal=='n')
  {//if value from bluetooth serial is n
    digitalWrite(13,HIGH);            //switch on LED
    if (lastValue!='n')
      Serial.println(F("LED is on")); //print LED is on
    lastValue=blueToothVal;
  }
  else if (blueToothVal=='f')
  {//if value from bluetooth serial is n
    digitalWrite(13,LOW);             //turn off LED
    if (lastValue!='f')
      Serial.println(F("LED is off")); //print LED is on
    lastValue=blueToothVal;
  }
  delay(1000);
}

#define trigPin 31
#define echoPin 33
char blueToothVal;           //value sent over via bluetooth
 
void setup()
{
 Serial.begin(9600); 
 //pinMode(13,OUTPUT);
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
}
long getDistance() {
  long duration, distance;
  digitalWrite(13,HIGH);            //switch on LED
  digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10); // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  
  if (distance >= 400 || distance <= 0){
      distance = getDistance();
  }
  
  return distance;
}
 
 
void loop()
{
  
  if(Serial.available()>0)
  {
    blueToothVal=Serial.read(); //read it
  }
  if (blueToothVal=='x')
  {
    
    
      Serial.print(getDistance());
      Serial.println(" cm");
    
  }
  blueToothVal = 'c';
  delay(1000);
}