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HC-SR04  

 

Vcc→5V

Trig→12

Echo→13

Gnd→GND

 

 

#define Trig 12
#define Echo 13

void setup() {
pinMode(Trig,OUTPUT);
pinMode(Echo,INPUT);
Serial.begin(9600);
}

void loop() {
float cm;
digitalWrite(Trig, HIGH);
delayMicroseconds(10);
digitalWrite(Trig, LOW);
cm=pulseIn(Echo, HIGH)*0.0172413;
Serial.println(cm);
delay(1000);
}

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