int trigPin = 2;
int echoPin = 4;
void setup() {
Serial.begin(9600);
}
void loop(){
long duration;
float cm;
pinMode(echoPin, INPUT);
pinMode(trigPin, OUTPUT);
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
cm = microsecondsToCentimeters(duration);
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
}
float microsecondsToCentimeters(long microseconds){
return (microseconds*0.034029)/2;
}