#define PIN_TRIG_S1 2
#define PIN_ECHO_S1 5

#define PIN_TRIG_S2 1
#define PIN_ECHO_S2 4


void setup() {
  Serial.begin(115200);

  Serial.println("Welcome to the Serial Monitor!");
  Serial.println("---------------------------------");

  pinMode(PIN_TRIG_S1, OUTPUT);
  pinMode(PIN_ECHO_S1, INPUT);

  pinMode(PIN_TRIG_S2, OUTPUT);
  pinMode(PIN_ECHO_S2, INPUT);

}

float calcDistanceCM(int trigPin,int echoPin) {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int duration = pulseIn(echoPin, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  // put your main code here, to run repeatedly:
  float distanceS1=calcDistanceCM(PIN_TRIG_S1,PIN_ECHO_S1);
  float distanceS2=calcDistanceCM(PIN_TRIG_S2,PIN_ECHO_S2);

  Serial.print("distanceS1:");
  Serial.println(distanceS1);

  Serial.print("distanceS2:");
  Serial.println(distanceS2);

  delay(1000);
}