Michal Rybář - ultrasonic

int trigPin1 = 2;
int echoPin1 = 3;
int trigPin2 = 4;
int echoPin2 = 5;
int trigPin3 = 6;
int echoPin3 = 7;

void setup() {
  Serial.begin(9600);
  pinMode ( trigPin1, OUTPUT ) ;
  pinMode ( echoPin1, INPUT ) ;
  pinMode ( trigPin2, OUTPUT ) ;
  pinMode ( echoPin2, INPUT ) ;
  pinMode ( trigPin3, OUTPUT ) ;
  pinMode ( echoPin3, INPUT );
}

void loop() {
  long t = 0, h = 0, hp = 0, t2 = 0, h2 = 0, hp2 = 0, t3 = 0, h3 = 0, hp3 = 0;
  //Transmitting pulse
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  t = pulseIn(echoPin1, HIGH);
  hp = t * 0.034 / 2;
  Serial.print("Sensor 1:");
  Serial.print(hp);
  Serial.println(" cm");

  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  t2 = pulseIn(echoPin2, HIGH);
  hp2 = t2 * 0.034 / 2;
  Serial.print("Sensor 2:");
  Serial.print(hp2);
  Serial.println(" cm");

  //Transmitting pulse
  digitalWrite(trigPin3, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin3, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin3, LOW);
  t3 = pulseIn(echoPin3, HIGH);
  hp3 = t3 * 0.034 / 2;
  Serial.print("Sensor 3:");
  Serial.print(hp3);
  Serial.println(" cm");
  delay(200);
}