test hc-sr04

test_hc-sr04.ino

//11 trig
//10 echo
//13 led

void setup(){
 pinMode(11, OUTPUT);
 pinMode(10, INPUT); 
 pinMode(13, OUTPUT);
}

void loop(){
 
 digitalWrite(11, HIGH);
 delay(10);
 digitalWrite(11, LOW);
 
 unsigned long distance=pulseIn(10, HIGH);
 
 digitalWrite(13, HIGH);
 delay(distance/1000);
 digitalWrite(13, LOW);
}