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

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address, columns, rows

const int buttonLeftPin = 2;   // Pin for left button (mode selection)
const int buttonRightPin = 3;  // Pin for right button (mode selection)
const int buttonStartPin = 4;  // Pin for start button
bool mc=0;
const int potPin = A0;         // Pin for potentiometer

const int buzzerPin = 5;       // Pin for the buzzer
const int S_pin = 6;       // Pin for the buzzer

int prevA0 = 0;
int mode = 0;  // Current food mode
int timer = 0; // Timer for the selected food
bool timerStarted = false;
unsigned long previousMillis = 0;
const long interval = 1000;  // Interval for timer update in milliseconds

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();  // Turn on the backlight
  lcd.print("Food Alarm");

  pinMode(buttonLeftPin, INPUT_PULLUP);
  pinMode(buttonRightPin, INPUT_PULLUP);
  pinMode(buttonStartPin, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);


  pinMode(S_pin, OUTPUT);

}

void loop() {



if(!digitalRead(buttonStartPin)){
lcd.clear();
    digitalWrite(S_pin, HIGH);

  lcd.setCursor(0, 0);
    lcd.print("Timer Started");
for(int k=timer;k>1;k--){
  
  lcd.setCursor(0, 1);
    lcd.print("Timeout In:");
    lcd.print(k);
    lcd.print(" ");
  delay(1000);

}


lcd.clear();

  lcd.setCursor(0, 0);
    lcd.print("Food Ready");
    digitalWrite(buzzerPin, HIGH);
  delay(5000);
    digitalWrite(buzzerPin, LOW);
    digitalWrite(S_pin, LOW);


}


if(!digitalRead(buttonLeftPin)){
delay(500);
mode--;
if(mode<0){
  mode=0;
}
mc=1;
  lcd.clear();

}
if(!digitalRead(buttonRightPin)){
  delay(500);

  mode++;
if(mode>6){
  mode=6;
}

mc=1;
  lcd.clear();

}

if (mc){
if(mode==0){
  lcd.setCursor(0, 0);
    lcd.print("0.  Dosa");

  lcd.setCursor(0, 1);
    lcd.print("Time=7");
    lcd.print(" ");

    timer=7;
}
if(mode==1){
  lcd.setCursor(0, 0);
    lcd.print("1.  Idli");

  lcd.setCursor(0, 1);
    lcd.print("Time=10");
    timer=10;
    }
if(mode==2){
  lcd.setCursor(0, 0);
    lcd.print("2.  Biryani");

  lcd.setCursor(0, 1);
      lcd.print("Time=12");
    timer=12;
}
if(mode==3){
  lcd.setCursor(0, 0);
    lcd.print("3.  Chapathi");

  lcd.setCursor(0, 1);
    lcd.print("Time=15");
        timer=15;

}
if(mode==4){
  lcd.setCursor(0, 0);
    lcd.print("4.  Kadala");
    timer=18;

  lcd.setCursor(0, 1);
    lcd.print("Time=18");
}
if(mode==5){
  lcd.setCursor(0, 0);
    lcd.print("5.  Puttu");
    timer=20;

  lcd.setCursor(0, 1);
    lcd.print("Time=20");
}

if(mode==6){
  lcd.setCursor(0, 0);
    lcd.print("6.  Mannual");

  lcd.setCursor(0, 1);
    lcd.print("Time=");
    lcd.print(timer);
    lcd.print(" ");

}
mc=0;
}

if(mode==6){
  
// Read the current analog value from pin A0
int currentA0 = analogRead(A0);

// Check if the current reading is different from the previous reading by more than ±10
if (abs(currentA0 - prevA0) > 10) {
  // Your code here to handle the condition when the difference is more than ±10

  // Update the previous analog reading
  prevA0 = currentA0;
  mc=1;
  timer = map(currentA0, 0, 1023, 1, 60); // Map pot value to timer range (1 to 60 minutes)}

}}
}