const int start = 2, alaram = 5, oneMin = 0;

int buttonState = 0; // Variable to store the button state

// Timer variables
volatile unsigned long timerStart = 0;
unsigned long timerDuration = 0;//6000;//0; // 1 minute in milliseconds

void setup() {
  pinMode(start, INPUT_PULLUP);
  pinMode(oneMin, INPUT_PULLUP);
  pinMode(alaram, OUTPUT);
}

void loop() {
  if(digitalRead(oneMin)) timerDuration = 180000;
  else timerDuration = 60000;
  // Check button state
  if (digitalRead(start))
    // Button pressed, update timer start time
    timerStart = millis();

  // Check if timer duration has elapsed
  if (millis() - timerStart >= timerDuration) {
    // Timer completed, start buzzer
    digitalWrite(alaram, HIGH);
  } else {
    // Timer running, keep buzzer off
    digitalWrite(alaram, LOW);
  }
}

// write ATtiny85 code in arduino to start timer if button 1 is pushed after completion of 1min buzer starts

// #include <avr/io.h>

// // Define button and buzzer pins
// const int buttonPin = 2;
// const int buzzerPin = 3;

// // Timer variables
// volatile unsigned long timerStart = 0;
// const unsigned long timerDuration = 60000; // 1 minute in milliseconds

// void setup() {
//   // Set button pin as input and enable pull-up resistor
//   DDRB &= ~(1 << buttonPin);
//   PORTB |= (1 << buttonPin);

//   // Set buzzer pin as output
//   DDRB |= (1 << buzzerPin);

//   // Start timer counter
//   TCNT0 = 0;
//   TCCR0B = (1 << CS01); // Start timer with prescaler 8
// }

// void loop() {
//   // Check button state
//   if (!(PINB & (1 << buttonPin))) {
//     // Button pressed, update timer start time
//     timerStart = millis();
//   }

//   // Check if timer duration has elapsed
//   if (millis() - timerStart >= timerDuration) {
//     // Timer completed, start buzzer
//     digitalWrite(buzzerPin, HIGH);
//   } else {
//     // Timer running, keep buzzer off
//     digitalWrite(buzzerPin, LOW);
//   }
// }