Arduino Sonar Scanner

#include <Servo.h>

#define TRIG_PIN 7
#define ECHO_PIN 8
#define SERVO_PIN 9
#define BUZZER_PIN 10

Servo myServo;

void setup() {
    Serial.begin(9600);
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);
    pinMode(BUZZER_PIN, OUTPUT);
    myServo.attach(SERVO_PIN);
}

void loop() {
    // Sweep from 0° to 180°
    for (int angle = 0; angle <= 180; angle += 5) {
        myServo.write(angle);
        delay(50);
        float distance = getDistance();
        Serial.print(angle);
        Serial.print(",");
        Serial.println(distance);

        // Buzzer alert if distance < 50 cm
        if (distance > 0 && distance < 50) {
            digitalWrite(BUZZER_PIN, HIGH);
        } else {
            digitalWrite(BUZZER_PIN, LOW);
        }
    }

    // Sweep back from 180° to 0°
    for (int angle = 180; angle >= 0; angle -= 5) {
        myServo.write(angle);
        delay(50);
        float distance = getDistance();
        Serial.print(angle);
        Serial.print(",");
        Serial.println(distance);

        // Buzzer alert if distance < 50 cm
        if (distance > 0 && distance < 50) {
            digitalWrite(BUZZER_PIN, HIGH);
        } else {
            digitalWrite(BUZZER_PIN, LOW);
        }
    }
}

// Function to measure distance
float getDistance() {
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    long duration = pulseIn(ECHO_PIN, HIGH, 30000); // Timeout
    if (duration == 0) return -1; // No object detected

    float distance = duration * 0.034 / 2;  // Convert time to distance
    return distance;
}