Arduino program to interface LEDs at pins 10,11,12,13 and button at pins 7. The press of button changes the pattern of LED glow. (considering four patterns of LED glow)

Write a program to interface LEDs at pins 10,11,12,13 and button at pins 7. The press of button changes the pattern of LED glow. (considering four patterns of LED glow) 

🔌 Connections

• LEDs → Pins 10, 11, 12, 13 (with current-limiting resistors)
• Push Button → Pin 7 (using internal pull-up)

💡 LED Patterns

• All LEDs ON
• All LEDs OFF
• LEDs glow one by one (running pattern)
• Alternate LEDs ON (10 & 12, then 11 & 13)

int leds[] = {10, 11, 12, 13};
int buttonPin = 7;
int pattern = 0;
int buttonState = HIGH;
int lastButtonState = HIGH;
void setup() {
  for (int i = 0; i < 4; i++) {
    pinMode(leds[i], OUTPUT);
  }
  pinMode(buttonPin, INPUT_PULLUP);  // Using internal pull-up
}
void loop() {
  buttonState = digitalRead(buttonPin);
  // Detect button press
  if (lastButtonState == HIGH && buttonState == LOW) {
    pattern++;
    if (pattern > 3) {
      pattern = 0;
    }
    delay(300); // Debounce delay
  }
  lastButtonState = buttonState;
  switch (pattern) {
    case 0: // Pattern 1: All LEDs ON
      for (int i = 0; i < 4; i++)
        digitalWrite(leds[i], HIGH);
      break;
    case 1: // Pattern 2: All LEDs OFF
      for (int i = 0; i < 4; i++)
        digitalWrite(leds[i], LOW);
      break;
    case 2: // Pattern 3: Running LED
      for (int i = 0; i < 4; i++) {
        digitalWrite(leds[i], HIGH);
        delay(200);
        digitalWrite(leds[i], LOW);
      }
      break;
    case 3: // Pattern 4: Alternate LEDs
      digitalWrite(10, HIGH);
      digitalWrite(11, LOW);
      digitalWrite(12, HIGH);
      digitalWrite(13, LOW);
      delay(300);
      digitalWrite(10, LOW);
      digitalWrite(11, HIGH);
      digitalWrite(12, LOW);
      digitalWrite(13, HIGH);
      delay(300);
      break;
  }
}

• Button press increments the pattern variable.
• switch case selects one of four LED patterns.
• INPUT_PULLUP avoids external resistor usage.
• Delay is added for button debouncing.