const int ECHO_PINS[] = {25, 2, 18};
const int TRIG_PINS[] = {26, 15, 5};
const int LED_PINS[] = {13, 12, 14};
const int NUM_SENSORS = 3;  
void setup() {
  Serial.begin(115200);

  for (int i = 0; i < NUM_SENSORS; i++) {
    pinMode(LED_PINS[i], OUTPUT);
    pinMode(TRIG_PINS[i], OUTPUT);
    pinMode(ECHO_PINS[i], INPUT);
  }
}
float readDistanceCM(int sensorNum) {
  digitalWrite(TRIG_PINS[sensorNum], LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PINS[sensorNum], HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PINS[sensorNum], LOW);
  int duration = pulseIn(ECHO_PINS[sensorNum], HIGH);
  return duration * 0.034 / 2;
}
void loop() {
  for (int i = 0; i < NUM_SENSORS; i++) {
    float distance = readDistanceCM(i);
    bool isNearby = distance > 200;
    digitalWrite(LED_PINS[i], isNearby);
    Serial.print("Measured distance sensor ");
    Serial.print(i + 1);
    Serial.print(": ");
    Serial.println(distance);
  }
  delay(100);
}