/*
 * ESP32 Blink LED with Push Button - Simple Code
 * When the button is pressed, the LED blinks rapidly.
 */

#define LED_PIN 18      // GPIO 13 connected to LED's anode
#define BUTTON_PIN 19   // GPIO 12 connected to one side of the button

int buttonState = 0;    // Variable to store the button state

void setup() {
  // Set the LED pin as an output
  pinMode(LED_PIN, OUTPUT);

  // Set the button pin as an input with internal pull-up resistor
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  // Read the state of the button
  // When pressed, the pin reads LOW due to INPUT_PULLUP and grounding
  buttonState = digitalRead(BUTTON_PIN);

  // Check if the button is pressed (state is LOW)
  if (buttonState == LOW) {
    // If pressed, blink the LED quickly
    digitalWrite(LED_PIN, HIGH); // Turn LED ON
    delay(100);                  // Wait for 100 milliseconds
    digitalWrite(LED_PIN, LOW);  // Turn LED OFF
    delay(100);                  // Wait for 100 milliseconds
  } else {
    // If the button is not pressed, turn the LED off
    digitalWrite(LED_PIN, LOW);
  }
}