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

LiquidCrystal_I2C lcd(0x27, 16 , 2);

#define pot 15
#define sw  23

int state = LOW;
int swState;
int lest_swState = HIGH;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

void setup() {
  Serial.begin(115200);
  pinMode(sw , INPUT);
  lcd.init();
  lcd.backlight(); //ให้ lcd สว่าง
  lcd.clear();
}

void loop() {
  int val = analogRead(pot);
  int degree = map(val,0,4095,0,100);

  lcd.setCursor(0,0);
  lcd.print("Value PoT:");
  
  lcd.setCursor(10,0);
  lcd.print(degree);
//----------------------------------------------

  int reading = digitalRead(sw);
  if (reading != lest_swState){
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay){
    if (reading != swState){
      swState = reading;
      if (swState == LOW) {
        state =!state;
      }
    }
  }
  lest_swState = reading;  
  if (state = LOW){
    lcd.setCursor(0,1);
    lcd.print("off");
  }
  else {
    lcd.setCursor(0,1);
    lcd.print("on");
  }

}