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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

int led = 11;         // the PWM pin the LED is attached to
int brightness = 0;  // how bright the LED is
int fadeAmount = 5;  // how many points to fade the LED by


LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, INPUT_PULLUP);
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
}

bool buttonState;
int time_old;
int time_now;
const int time_wait = 200;  // [ms]

void loop() {
  time_now = millis();
  buttonState = digitalRead(10);

  if (time_now - time_old >= time_wait) {
    time_old = time_now;
    // change the brightness for next time through the loop:
    brightness = brightness + fadeAmount;
    analogWrite(led, brightness);

    // reverse the direction of the fading at the ends of the fade:
    if (brightness <= 0 || brightness >= 255) {
      fadeAmount = -fadeAmount;
    }
  }

  if (buttonState==LOW) {
    digitalWrite(9,HIGH);
  }
  else {
    digitalWrite(9,LOW);
  }
  lcd.print(buttonState);
  lcd.setCursor(0,0);

  Serial.println(buttonState);
  
  delay(10);
}