#define TRIG_PIN 14
#define ECHO_PIN 27
#define LED_PIN 5

void setup() {
    Serial.begin(115200);
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);
    pinMode(LED_PIN, OUTPUT);
}

void loop() {
    long duration;
    float distance;

    // Trigger the ultrasonic sensor
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    // Read echo pin
    duration = pulseIn(ECHO_PIN, HIGH);

    // Convert duration to distance (cm)
    distance = duration * 0.034 / 2; 

    Serial.print("Distance: ");
    Serial.print(distance);
    Serial.println(" cm");

    // If the object is closer than 10 cm, turn on the LED
    if (distance < 100 && distance > 0) {
        digitalWrite(LED_PIN, HIGH);
    } else {
        digitalWrite(LED_PIN, LOW);
    }

    delay(500); // Wait for 500ms before the next measurement
}