// Button Bounce counter
// 
// Red button has bouncing simulation enabled,
// Blue button has bouncing simulation disabled.
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
#define SW_PIN 4
#define LED_PIN 5
int st_SW=0;
String st_LED;
int SW;
void setup() 
  {
  Serial.begin(115200);
  pinMode(SW_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  lcd.init();
  lcd.backlight();
  }


void loop() 
  {
    SW=digitalRead(SW_PIN);
    delay(100);
    //st_SW=not(SW);
    //Serial.print("st_SW =  ");
   // Serial.println(st_SW);
   lcd.setCursor(3, 0);
   lcd.print("LED =  ");
   lcd.setCursor(10, 0);
   lcd.print(st_LED);
    while(st_SW==1)
      {
            SW=digitalRead(SW_PIN);
             //delay(100);
             Serial.print("st_SW =  ");
             Serial.println(st_SW);
             digitalWrite(LED_PIN, HIGH);
                lcd.setCursor(3, 0);
                lcd.print("LED =  ");
                lcd.setCursor(10, 0);
                lcd.print(st_LED);
             if(SW==0)
                {
                  st_SW=0;
                  st_LED="OFF ";
                }
      }
      delay(100);
    while(st_SW==0)
      {
             SW=digitalRead(SW_PIN);
             //delay(100);
             st_LED="OFF";
             Serial.print("st_SW =  ");
             Serial.println(st_SW);
             digitalWrite(LED_PIN, LOW);
                lcd.setCursor(3, 0);
                lcd.print("LED =  ");
                lcd.setCursor(10, 0);
                lcd.print(st_LED);
             if(SW==0)
                {
                  st_SW=1;
                  st_LED="ON  ";
                }
      }
      delay(100);
  }