// Etäisyysmittarin koodi

#define trigPin  9

#define echoPin  10

long duration;

int distance;

void setup() {

 pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output

 pinMode(echoPin, INPUT); // Sets the echoPin as an Input

 Serial.begin(9600); // Starts the serial communication

}

void loop() {

 // Clears the trigPin

 digitalWrite(trigPin, LOW);

 delayMicroseconds(2);

 // Sets the trigPin on HIGH state for 10 micro seconds

 digitalWrite(trigPin, HIGH);

 delayMicroseconds(10);

 digitalWrite(trigPin, LOW);

 // Reads the echoPin, returns the sound wave travel time in microseconds

 duration = pulseIn(echoPin, HIGH);

 

 // Calculating the distance

 distance = duration * 0.034 / 2;

 

 // Prints the distance on the Serial Monitor

 Serial.print("Etäisyys: ");

 Serial.println(distance);

}