SEONGJUHONG

초음파 센서로 LED 제어하기

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by

Seongju Hong
in , ,

저번 시간에는 초음파란 무엇인지, 그리고 초음파 센서의 작동방식에 대해서 학습했다. 이번에는 초음파센서를 이용하여 LED를 ON/OFF하는 예제를 실습해보자.

아두이노 기초 프로그래밍에서, 조건문(if문)을 배웠는데, 조건문을 이용하여, 일정거리 이하일 때 LED를 ON하고, 일정거리 이상일 때 LED를 OFF하도록 해보자.

준비물

NO부품명수량
1아두이노 UNO R31
2초음파 센서(HC-SR04)1
3LED1
4330Ω 저항1
5브레드 보드1
6점퍼 케이블8

회로도

코드

코드 보기

int echoPin = 7; // 송신부
int trigPin = 8; // 수신부
 
int led = 3; // led핀을 선언
 
float duration;
float distance;

void setup() 
{
  Serial.begin(9600);
 
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(led, OUTPUT);
}
 
void loop() 
{
  digitalWrite(trigPin, HIGH); // 초음파 송신
  delay(10);
  digitalWrite(trigPin, LOW);
 
  duration = pulseIn(echoPin, HIGH); // Echo pin이 HIGH를 유지한 시간 저장
  distance = ((float)(340 * duration) / 10000) / 2; // 거리 계산
 
  // 측정된 거리 값를 시리얼 모니터에 출력
  Serial.print(distance);
  Serial.println("cm");
 
  // 측정된 거리가 10cm 이하라면, LED ON
  if (distance < 10) 
  {
    digitalWrite(led, HIGH);
  }
  // 측정된 거리가 10cm 이상이라면, LED OFF
  else 
{
    digitalWrite(led, LOW);
  }
  // 0.2초 동안 대기
  delay(200);
}

 

실습

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Comments

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