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

const byte Btn1 = 2;
const byte LED1 = 12;
const byte Bzr1 = 5;
volatile bool ISR1 = false;
const byte VPOT = A0;
const float Vref = 5.0;
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(Bzr1, OUTPUT);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  pinMode(Btn1, INPUT_PULLUP);
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(Btn1),ISR11,RISING);
}

void loop() {
  
  //check intterupt 2
  if(ISR1){
  Serial.println("Interrupt detected wait 5 Seconds");
  digitalWrite(LED1, HIGH);
  lcd.clear();                 // clear display
  lcd.setCursor(4, 0);         // move cursor to   (4, 0)
  lcd.print("INTERRUPT");        // print message at (4, 0)
  lcd.setCursor(4, 1);         // move cursor to   (4, 1)
  lcd.print("5 Seconds"); // print message at (4, 1)
  delay(5000);                 // display the above for twelve second
  digitalWrite(LED1, LOW);
  ISR1 = false;
  lcd.clear();
  }
  POT1();
}

void POT1(){
int s = analogRead(VPOT);
float vol = (s * Vref/1023);
//float voltage = map(analog_value, 0, 1023, 0 , 5);
char analog_string[7];
dtostrf(vol, 5, 2, analog_string); 
  lcd.clear();
  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("Volts:");        // print message at (0, 0)
  lcd.print(analog_string);
  lcd.print("V");
  lcd.setCursor(0, 1);         // move cursor to   (0, 0)
  lcd.print("Reso:");
  lcd.print(s);
  Serial.println("Voltage =" + String(analog_string) + "V" + " and resolution =" + s);
  delay(100); 
  }

void ISR11(){
    ISR1 = true;
}