#define TRIG_PIN 13
#define ECHO_PIN 12
#define BUZZER_PIN 14

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

          void loop() {
            long duration, distance;
              
                digitalWrite(TRIG_PIN, LOW);
                  delayMicroseconds(2);
                    digitalWrite(TRIG_PIN, HIGH);
                      delayMicroseconds(10);
                        digitalWrite(TRIG_PIN, LOW);
                          
                            duration = pulseIn(ECHO_PIN, HIGH);
                              
                                distance = duration * 0.034 / 2;
                                  
                                    Serial.print("Distance: ");
                                      Serial.print(distance);
                                        Serial.println(" cm");
                                          
                                            if (distance < 50) { // Adjust this value according to your preference
                                                digitalWrite(BUZZER_PIN, HIGH);
                                                    delay(1000); // Adjust the duration of the buzzer sound
                                                        digitalWrite(BUZZER_PIN, LOW);
                                                          }
                                                            
                                                              delay(1000); // Adjust the delay between readings
                                                              }