Page 249 - MDP2022-3

delayMicroseconds(2);

digitalWrite(TRIG, HIGH);

delayMicroseconds(10);

digitalWrite(TRIG, LOW);

duration = pulseIn (ECHO, HIGH);

distance = duration * 17 / 1000;

Serial.print("\nDIstance : ");

Serial.print(distance);

Serial.println(" Cm");

if(distance <= 15 || distance >= 2500){
Serial.println("문에 부딛힐 위험이 있습니다!");
digitalWrite(LED, HIGH);
tone(BOOZER, 254);
delay(100);

digitalWrite(LED,LOW);
noTone(BOOZER);
delay(100);
}

else if(distance > 15){
Serial.println("안전합니다");
digitalWrite(LED,LOW);
noTone(BOOZER);
delay(500);
}

}