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<pre class="brush:cpp">  /*HC-SR04 Ping distance sensor:VCC to arduino 5vGND to arduino GNDEcho to Arduino pin 7Trig to Arduino pin 8This sketch originates from Virtualmix: http://goo.gl/kJ8GlHas been modified by Winkle ink here: http://winkleink.blogspot.com.au/2012/05/arduino-hc-sr04-ultrasonic-distance.htmlAnd modified further by ScottC here: http://arduinobasics.blogspot.com.au/2012/11/arduinobasics-hc-sr04-ultrasonic-sensor.htmlon 10 Nov 2012Further modified by Peter Takacs on 04/02/04 https://patakacs.wordpress.com/2014/02/04/ultrasonic-sensor-hc-sr04-and-piezo-speakers-measuring-distance-and-playing-a-tone-with-piezo/*/ int echoPin = 7;int trigPin = 8;int LEDPinYellow = 2; // Yellow LEDint LEDPinGreen = 4; // Green LEDint soundPin = 12; // Piezo int maximumRange = 100;int minimumRange = 0;long duration, distance; void setup() {Serial.begin (9600); // Init communications to serial monitorpinMode(trigPin, OUTPUT);pinMode(echoPin, INPUT);pinMode(LEDPinYellow, OUTPUT);pinMode(LEDPinGreen, OUTPUT);} void loop() {/* The following trigPin/echoPin cycle is used to determine thedistance of the nearest object by bouncing soundwaves off of it. */digitalWrite(trigPin, LOW);delayMicroseconds(2); digitalWrite(trigPin, HIGH);delayMicroseconds(10); digitalWrite(trigPin, LOW);duration = pulseIn(echoPin, HIGH); //Calculate the distance (in cm) based on the speed of sound.distance = duration/58.2; if (distance >= maximumRange || distance <= minimumRange){// Yellow led indicated out of maximumRange. Prints “Out Of Range” to serial if target is outside maximumRange.Serial.println(“Out Of Range”);digitalWrite(LEDPinYellow, HIGH);digitalWrite(LEDPinGreen, LOW);}else {// When ultasonic sensor picks up a signal _within_ maximumRange, print distance in cm to serial monitor, turn off YellowLed and turn on GreenLED.Serial.print(“Distance = ” );Serial.print(distance);Serial.println(” cm” );digitalWrite(LEDPinYellow, LOW);digitalWrite(LEDPinGreen, HIGH);tone(soundPin, 800, 300);delay(distance); // Distance is the delay in ms between tones, ie Near maxRange -> Long tones, Near minimumRange -> Rapid tones.noTone(soundPin); } // Mandatory delaydelay(50);}