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Code Block

language	c#
title	The Arduino can detect the measured distance of a sensor and print it to the console
linenumbers	true
collapse	true

/*
 * code partly 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;
  // To trigger the digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this linesensor a 10us HIGH signal is needed.
  // Create definite LOW for 2us 
  digitalWrite(trigPin, HIGHLOW);
//  delayMicroseconds(10002); - Removed this line
  delayMicroseconds(10); // AddedGive thisit line
a HIGH digitalWrite(trigPin, LOW);for 10us
  duration = pulseIn(echoPindigitalWrite(trigPin, HIGH);
  distance = (duration/2) / 29.1;
  if (distance < 4) {delayMicroseconds(10);
  // This is where the LED On/Off happensLOW again
  //digitalWrite(ledtrigPin,HIGH LOW);
  // WhenMeasure the Redpulse conditionwidth isof met, the Greenincoming LEDsignal
 should turnduration off
  //digitalWrite(led2,LOW= pulseIn(echoPin, HIGH);
}
  // elseCalculate {
the distance with  //digitalWrite(led,LOW);given function
  distance = (duration//digitalWrite(led2,HIGH);
  }2) / 29.1;

 
  if (distance >= 400 || distance <= 0) {
    Serial.println("Out of range");
  }
  else {
    Serial.print(distance);
    Serial.println(" cm");
  }
  // Wait a microsecond to start again
  delay(1);
}

Code Block

language	c#
title	The Arduino can receive command via bluetooth and set an LED on or off
linenumbers	true
collapse	true

/*
 * code partly 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); 

 
void setup() {
  // Start a bluetooth connection via Serial1 ports
  Serial.begin(9600); 
  // User the LED on pin 13
  pinMode(13,OUTPUT);
}
 
 
void loop()
{ {
  // If data over Serial1 are received
  if(Serial.available()>0) {
    {//if thereRead isthe data being recieved
    blueToothVal=Serial.read();
  }
  //read it
  } If the data equal the letter 'n'
  if (blueToothVal=='n') {
    {//if valueSwitch from bluetooth serial is nLED on
    digitalWrite(13,HIGH);            //switch on LED
    if (lastValue!='n')
      Serial.println(F("LED is on")); //print LED is on
    lastValue=blueToothVal;
  }}
  // Else if the data equal the letter 'f'
  else if (blueToothVal=='f') {
   { //if valueSwitch from bluetooth serial is nLED off
    digitalWrite(13,LOW);             //turn off LED
    if (lastValue!='f')
      Serial.println(F("LED is off")); //print LED is on
    lastValue=blueToothVal;
  }
  delay(1000}
  // Wait 100ms
  delay(100);
}

Code Block

language	c#
title	A computer can connect wirelessly to the Arduino and get the measured distance via bluetooth terminal
linenumbers	true
collapse	true

#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");
  }
 
  // Reset blueToothVal to 
any letter but }'x'
  blueToothVal = 'c';
  delay(1000100);
}

The Bluetooth module is found on the MacBook Pro as HC-06 in the list of available Bluetooth devices. A connection can be established with Code '1234'.

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