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

const byte Btn1 = 2;
const byte Btn2 = 3;
const byte LED1 = 12;
const byte LED2 = 11;
volatile bool ISR1 = false;
volatile bool ISR2 = false;
const byte VPOT1 = A0;
const byte VPOT2 = A1;
const float Vref1 = 5.0;
const float Vref2 = 2.5;
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  pinMode(Btn1, INPUT_PULLUP);
  pinMode(Btn2, INPUT_PULLUP);
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(Btn1),ISR11,CHANGE);
  attachInterrupt(digitalPinToInterrupt(Btn2),ISR12,CHANGE);
}

void loop() {
  
  //check intterupt 1
  if(ISR1){
  Serial.println("Interrupt 1 detected wait 5 Seconds");
  digitalWrite(LED1, HIGH);
  lcd.clear();                 // clear display
  lcd.setCursor(4, 0);         // move cursor to   (4, 0)
  lcd.print("INTERRUPT 1");        // 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();
  }

  //check intterupt 2
  if(ISR2){
  Serial.println("Interrupt 2 detected wait 7 Seconds");
  digitalWrite(LED2, HIGH);
  lcd.clear();                 // clear display
  lcd.setCursor(4, 0);         // move cursor to   (4, 0)
  lcd.print("INTERRUPT 2");        // print message at (4, 0)
  lcd.setCursor(4, 1);         // move cursor to   (4, 1)
  lcd.print("7 Seconds"); // print message at (4, 1)
  delay(7000);                 // display the above for twelve second
  digitalWrite(LED2, LOW);
  ISR2 = false;
  lcd.clear();
  }

  POT1();
  POT2();
}

void POT1(){
int s = analogRead(VPOT1);
float vol1 = (s * Vref1/1023);
//float voltage = map(analog_value, 0, 1023, 0 , 5);
char analog_string1[7];
dtostrf(vol1, 5, 2, analog_string1); 
  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("Volts:");        // print message at (0, 0)
  lcd.print(analog_string1);
  lcd.print("V,FS");
  Serial.println("Full scale Voltage = " + String(analog_string1) + "V" + " and resolution = " + s);
  delay(100); 
  }

void POT2(){
int c = analogRead(VPOT2);
int c1 = c/2;
float vol2 = (c1 * Vref2/511);
//float voltage = map(analog_value, 0, 1023, 0 , 5);
char analog_string2[7];
dtostrf(vol2, 5, 2, analog_string2); 
  lcd.setCursor(0, 1);         // move cursor to   (0, 0)
  lcd.print("Volts:");        // print message at (0, 0)
  lcd.print(analog_string2);
  lcd.print("V,HS");
  Serial.println("Half scale Voltage = " + String(analog_string2) + "V" + " and resolution = " + c1);
  delay(100); 
  }
void ISR11(){
    ISR1 = true;
}

void ISR12(){
    ISR2 = true;
}