Sensore ad ultrasuoni HY-SRF05 o HC-SR04 con Arduino

 Realizziamo un misuratore di distanza ad ultrasuoni (range: 3 cm - 4 m).

Occorrente:
1 Arduino
1 Sensore ultrasuoni HY-SRF05 oppure HC-SR04
1 breadboard

Montaggio circuito

Sketch

/*
Tested with HY-SRF05, HC-SR04
Assuming a room temp of 20 degrees centigrade
The circuit:
 * VVC connection of the sensor attached to +5V
 * GND connection of the sensor attached to ground
 * TRIG connection of the sensor attached to digital pin 12
        * ECHO connection of the sensor attached to digital pin 13
*/
 
const int TRIG_PIN = 12;
const int ECHO_PIN = 13;
 
void setup() {
  // initialize serial communication:
  Serial.begin(9600);
 
  pinMode(TRIG_PIN,OUTPUT);
  pinMode(ECHO_PIN,INPUT);
}
 
void loop()
{
   long duration, distanceCm, distanceIn;
 
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN,HIGH);
 
  // convert the time into a distance
  distanceCm = duration / 29.1 / 2 ;
  distanceIn = duration / 74 / 2;
 
  if (distanceCm <= 0){
    Serial.println("Out of range");
  }
  else {
    
    Serial.print(distanceIn);
    Serial.print("in, ");
    Serial.print(distanceCm);
    Serial.print("cm");
    Serial.println();
  }
  delay(1000);
}