#include <LiquidCrystal_I2C.h>
 

LiquidCrystal_I2C lcd(0x27,16,2);
const int SecondPin = 34;
const int MinutePin = 35;
const int HourPin = 32;
struct Button {
    const uint8_t PIN;
    uint32_t numberKeyPresses;
    bool pressed;
};

Button Start {23,0,false};
Button Reset = {18, 0, false};
unsigned long button_time = 0;  
unsigned long last_button_time = 0; 
volatile int total =0;
void IRAM_ATTR isr() {
    button_time = millis();
if (button_time - last_button_time > 250)
{
        Reset.numberKeyPresses++;
        Reset.pressed = true;
       last_button_time = button_time;
       total =0;
}
}

void IRAM_ATTR start() {
    button_time = millis();
if (button_time - last_button_time > 250)
{
        Start.numberKeyPresses++;
        Start.pressed = true;
       last_button_time = button_time;
}
}

int Second = 0;
int second=0;
int Minute =0;
int minute =0;
int Hour =0;
int hour =0;
void setup() {
  Serial.begin(115200);
  pinMode (4,OUTPUT);
  pinMode(Start.PIN, INPUT_PULLUP);
  attachInterrupt(Start.PIN,start,FALLING);
  attachInterrupt(Reset.PIN, isr, FALLING);
   lcd.init();
    lcd.clear();         
    lcd.backlight();      
    lcd.setCursor(2,0);   
    lcd.print("Time Remaining");
    
    lcd.setCursor(2,1);  
  delay(1000);
}

void loop() {
  // Reading potentiometer value
  Second = analogRead(SecondPin);
  second = map(Second, 0, 4095, 0, 60);
  Serial.printf("The second value is %d \n",second );
  delay(500);
  Minute = analogRead(MinutePin);
  minute = map(Minute, 0, 4095, 0, 60);
  Serial.printf("The minute value is %d \n",minute );
  delay(500);
  Hour = analogRead(HourPin);
  hour = map(Hour, 0, 4095, 0, 60);
  Serial.printf("The Hour value is %d \n",hour );
  delay(500);
        if(Start.pressed){
      total = 1000*second+60*1000*minute+60*60*1000*hour;

        if(total >= 0){
          digitalWrite(4, HIGH);
          while(total >= 100){
            delay(100);
            total -=100;
            Serial.printf("Total delay remaining %d \n" ,total);\
            lcd.setCursor(2,1);
            lcd.print(total);
          }

        }
      digitalWrite(4,LOW);
      Start.pressed = false;
    }

    delay(500);
    lcd.clear();
    lcd.setCursor(2,0);   
    lcd.print("Time Remaining");
    lcd.setCursor(2,1);   
    lcd.print("0");



}