/*
 * 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  19 // ESP32 pin GPIO18, which connected to button
#define LED_PIN     16 // ESP32 pin GPIO21, which connected to led

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);

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



void setup() {
  // initialize the LED pin as an output:
  Serial.begin(9600);
 lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);

  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:
   lcd.setCursor(0,0);
lcd.print("GG test:");

  button_state = digitalRead(BUTTON_PIN);
  Serial.print("first loop state=");
Serial.println(button_state);
  // control LED according to the state of button
  if (button_state == LOW)       // if button is pressed
   { digitalWrite(LED_PIN, HIGH); // turn on LED
     lcd.clear();
   lcd.setCursor(0,0);
lcd.print("HEEEEEY");


delay (2000);
}



  else                           // otherwise, button is not pressing
    digitalWrite(LED_PIN, LOW);  // turn off LED
}


/*  // initialize the LED pin as an output:
PULLDOWN
  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_PULLDOWN);
}

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 == HIGH)       // if button is pressed
    digitalWrite(LED_PIN, HIGH); // turn on LED
  else                           // otherwise, button is not pressing
    digitalWrite(LED_PIN, LOW);  // turn off LED
}*/