Arduino-IDE/GPIO at main · arunn2004/Arduino-IDE · GitHub

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1] INDIVIDUAL LED ON AND OFF   (digital write):

void setup()
{
  pinMode(6,OUTPUT);

}
void loop()
{
  digitalWrite(6,HIGH);
  delay(1000);
  digitalWrite(6,LOW);
  delay(1000);

}

void setup()
{
  pinMode(2,OUTPUT);
  pinMode(5,OUTPUT);
}
void loop()
{
  digitalWrite(2,HIGH);
  delay(1000);
  digitalWrite(2,LOW);
  delay(1000);
  digitalWrite(5,HIGH);
  delay(1000);
  digitalWrite(5,LOW);
  delay(1000)
}


2] CONTINOUS LED ON AND OFF    (digital write):
void setup()
{
  pinMode(2,OUTPUT);
  pinMode(5,OUTPUT);
}
void loop()
{
  digitalWrite(2,HIGH);
  digitalWrite(5,HIGH);
  delay(1000);

  digitalWrite(2,LOW);
  digitalWrite(5,LOW);
  delay(1000);
}

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

3] 13 pin [one by one ]ON AND OFF   (digital write):
void setup()
{
  for(int pin=1;pin<=13;pin++)
  {
    pinMode(pin,OUTPUT);
  }

}
void loop()
{
  for(int pin=1;pin<=13;pin++)
  {
    digitalWrite(pin,HIGH);
     delay(1000);
  }


  for(int pin=1;pin<=13;pin++)
  {
    digitalWrite(pin,LOW);
      delay(1000);
  }
}


4] CONTINOUS 13pin  ON AND OFF   (digital write):
void setup()
{
  for(int pin=1;pin<=13;pin++)
  {
    pinMode(pin,OUTPUT);
  }

}
void loop()
{
  for(int pin=1;pin<=13;pin++)
  {
    digitalWrite(pin,HIGH);

  }
      delay(1000);


  for(int pin=1;pin<=13;pin++)
  {
    digitalWrite(pin,LOW);

  }
  delay(1000);
}

___________________________________________________________________________________________________________________________________________________________________________________________________________

5] BUTTON AND LED    (Digital read and digital write) :
void setup()
{
  pinMode(1,INPUT);
  pinMode(2,OUTPUT);
  pinMode(3,INPUT);
  pinMode(4,OUTPUT);
}
void loop()
{
  if(digitalRead(1))
  {
    digitalWrite(2,HIGH);
  }
  else
  {
    digitalWrite(2,LOW);
  }

  if(digitalRead(3))
  {
    digitalWrite(4,HIGH);
  }
  else
  {
    digitalWrite(4,LOW);
  }
}


6 ] 2 BUTTON ,ONE LED , EITHER  BUTTON ON   (Digital read and digital write) :

void setup()
{
  pinMode(1,INPUT);
  pinMode(2,OUTPUT);
  pinMode(3,INPUT);
}
void loop()
{
  if((digitalRead(1))||(digitalRead(3)))
  {
     digitalWrite(2,HIGH);
  }
  else
  {
    digitalWrite(2,LOW);
  }
}


7 ] 2 BUTTON ,ONE LED , DOUBLE  BUTTON ON   (Digital read and digital write) :
void setup()
{
  pinMode(1,INPUT);
  pinMode(2,OUTPUT);
  pinMode(3,INPUT);
}
void loop()
{
  if((digitalRead(1)) && (digitalRead(3)))
  {
     digitalWrite(2,HIGH);
  }
  else
  {
    digitalWrite(2,LOW);
  }
}

_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

                                                                           PULL UP [ negative logic ]
8 ] Switch off [ HIGH ] , Switch on [Low ] :

// Negative Logic: LOW = ON


void setup() {
  pinMode(13, OUTPUT);
  pinMode(2, INPUT_PULLUP);  // internal pull-up
}

void loop() {
  if (digitalRead(2) == LOW) {
    digitalWrite(13, HIGH);   // LED ON
  } else {
    digitalWrite(13, LOW);    // LED OFF
  }
}

                                                                        PULL DOWN [ Positive logic ]

// Positive  Logic: LOW = ON

#define LED_PIN 13
#define BTN_PIN 2

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BTN_PIN, INPUT_PULLUP);  // internal pull-up
}

void loop() {
  if (digitalRead(BTN_PIN) == HIGH) {
    digitalWrite(LED_PIN, HIGH);   // LED ON
  } else {
    digitalWrite(LED_PIN, LOW);    // LED OFF
  }
}