Pull-up & Push-down

Pull - Up

 

Pull Up

const int Btn = 7;

void setup()
{
 Serial.begin(9600);
 pinMode(Btn, INPUT); 
}

void loop()
{
 int value = digitalRead(Btn);
 Serial.println(value);
  
 /* 
 Button Pull -> 1 (ON)
 Button Push -> 0 (OFF)
 */
}

---

 

Pull - Down

 

Pull-Down

const int Btn = 7;

void setup()
{
 Serial.begin(9600);
 pinMode(Btn, INPUT);
}

void loop()
{
 int value = digitalRead(Btn);
 Serial.println(value);
  
 /* 
 Button Pull -> 0 (OFF)
 Button Push -> 1 (ON)
 */
}

---

 

<Pull-down>
-down 방식으로 스위치를 1개 구성하고, LED를 1개 구성하여서 스위치가 눌려져 있을 때 LED 불이 켜지고, 
스위치가 열려 있을 때 LED 불이 꺼지도록 회로 및 프로그래밍을 작성하여라

이때, 스위치와 LED의 신호는 독립적이다.

1. 표 구성
2. 회로 구성
3. 코드 작성

 

const int LED = 3;
const int Btn = 7;

int Btn_state = 0;

void setup()
{
	pinMode(LED, OUTPUT);
	pinMode(Btn, INPUT);
}

void loop()
{
  	
	int value = digitalRead(Btn);

	if (value == HIGH)
	{
		if (Btn_state = 0)
		{
			Btn_state = 1;
		}
	}

	else if (Btn_state == 1)
	{
		Btn_state = 0;
	}
	
	if (Btn_state == 0)
	{
      	digitalWrite(LED, LOW);
	}
	else if (Btn_state == 1)
	{
		digitalWrite(LED, HIGH);
	}
}

const int P_LED = 3;
const int B_LED[5] = {8, 9, 10, 11, 12};

const int Btn = 7;

int Btn_state = 0;

void setup()
{
 Serial.begin(9600);
 pinMode(P_LED, OUTPUT);
 for (int i = 0; i < 5; i++)
 {
   pinMode(B_LED[i], OUTPUT);
 }
  
 pinMode(Btn, INPUT);
}

void loop()
{
  /* 가변저항 */
  int val = analogRead(A0) / 4;
  analogWrite(P_LED, val);
  
  int value = digitalRead(Btn);
  Btn_state += value;
  delay(100);
  Serial.println(val);
  
  /* LED 버튼 */
  for (int i = 0; i < 5; i++)
  {
    digitalWrite(B_LED[i], LOW);
  }
    
  digitalWrite(B_LED[Btn_state], HIGH);
  if(Btn_state == 4)
  {
    Btn_state = 0;
  }
}

const int P_LED = 3;
const int B_LED[5] = {8, 9, 10, 11, 12};

const int Btn = 7;

int Btn_state = 0;

void setup()
{
 Serial.begin(9600);
 pinMode(P_LED, OUTPUT);
 for (int i = 0; i < 5; i++)
 {
   pinMode(B_LED[i], OUTPUT);
 }
  
 pinMode(Btn, INPUT);
}

void loop()
{
  /* 가변저항 */
  int val = analogRead(A0) / 4;
  analogWrite(P_LED, val);
  
  int value = digitalRead(Btn);
  Btn_state += value;
  delay(100);
  Serial.println(val);
  
  for (int i = 0; i < 5; i++)
  {
    digitalWrite(B_LED[i], LOW);
  }
  
  /* LED 버튼 */  
  digitalWrite(B_LED[Btn_state], HIGH);
  if(Btn_state == 4)
  {
    Btn_state = 0;
  }
  
  /*
  switch(Btn_state)
  {
    case 0:
    digitalWrite(B_LED[Btn_state], HIGH);
    break;
    
    case 1:
    digitalWrite(B_LED[Btn_state], HIGH);
    break;
    
    case 2:
    digitalWrite(B_LED[Btn_state], HIGH);
    break;
    
    case 3:
    digitalWrite(B_LED[Btn_state], HIGH);
    break;
    
    case 4:
    digitalWrite(B_LED[Btn_state], HIGH);
    break;
  }
  if (Btn_state == 4)
  {
    Btn_state = 0;
  }
  */
}