#include <ezButton.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>

#define BUTTON_PIN  4 // ESP32 pin GPIO4
#define LED_PIN     2 // ESP32 pin GPIO2

LiquidCrystal_I2C lcd(0x27, 16, 2);
ezButton button(BUTTON_PIN);

// variables will change:
int led_state = LOW;   // the current state of LED

void setup() {
  Serial.begin(9600);         // initialize serial
  pinMode(LED_PIN, OUTPUT);   // set ESP32 pin to output mode
  button.setDebounceTime(50); // set debounce time to 50 milliseconds
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Sistema Listo");
  Serial.println("Sistema Listo");
  }
void loop() {
  button.loop(); // MUST call the loop() function first
  if (button.isPressed()) {
    Serial.println("Press");
    led_state = !led_state;  // toggle state of LED
    if (led_state==1) {
      lcd.setCursor(8,1);
      lcd.print("   ON   ");
    }
    if (led_state==0) {
      lcd.setCursor(8,1);
      lcd.print("   OFF  ");
    }
    digitalWrite(LED_PIN, led_state);
  }
}