HC-SR04 İle Mesafe Ölçümü

Arduino'nuza sensör; dışarıya bakacak şekilde, GND bacağı GND'ye; VCC bacağı ise 11 numaralı pine bağlanmalıdır.

Ledlerinizin +bacağını A0 A2 A3 A5 pinlerine bağlayın. GND'yi ise hepsini birlikte 1/4w ~250ohm dirence bağlayın.

#define sensor_VCC 11
#define trig 12
#define echo 13

#define led1 19 //a5 oluyor
#define led2 17
#define led3 16
#define led4 14
long duration, distance;
void setup() {
  // put your setup code here, to run once:
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(sensor_VCC, OUTPUT);
  digitalWrite(sensor_VCC,HIGH);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trig, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trig, HIGH);
  delayMicroseconds(10); // Added this line
  digitalWrite(trig, LOW);
  duration = pulseIn(echo, HIGH);
  distance = (duration/2) / 29.1;
  if (distance < 8) {  // This is where the LED On/Off happens
    digitalWrite(led1,HIGH);
    digitalWrite(led2,HIGH);
    digitalWrite(led3,HIGH);
    digitalWrite(led4,HIGH);  
  }
  else if (distance < 15) {
    digitalWrite(led1,HIGH);
    digitalWrite(led2,HIGH);
    digitalWrite(led3,HIGH);
    digitalWrite(led4,LOW);
  }else if(distance < 30){
    digitalWrite(led1,HIGH);
    digitalWrite(led2,HIGH);
    digitalWrite(led3,LOW);
    digitalWrite(led4,LOW);
  }else if(distance < 45){
    digitalWrite(led1,HIGH);
    digitalWrite(led2,LOW);
    digitalWrite(led3,LOW);
    digitalWrite(led4,LOW);
    
  }else {
    digitalWrite(led1,LOW);
    digitalWrite(led2,LOW);
    digitalWrite(led3,LOW);
    digitalWrite(led4,LOW);
}
  delay(100);
}

Kısmi olarak jsvester adlı arkadaştan kopya çektim. Duyrulur.