/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-button-led
 */

#define BUTTON_PIN 15  // ESP32 pin GIOP16, which connected to button
#define LED_PIN    18  // ESP32 pin GIOP18, which connected to led

// variables will change:
int button_state = 0;   // variable for reading the button status

void setup() {
  // initialize the LED pin as an output:
  pinMode(LED_PIN, OUTPUT);
  // initialize the button pin as an pull-up input:
  // the pull-up input pin will be HIGH when the button is open and LOW when the button is pressed.
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  // read the state of the button value:
  button_state = digitalRead(BUTTON_PIN);

  // control LED according to the state of button
  if (button_state == LOW)       // if button is pressed
    digitalWrite(LED_PIN, HIGH); // turn on LED
  else                           // otherwise, button is not pressing
    digitalWrite(LED_PIN, LOW);  // turn off LED
}