ATtiny13 Bikelight

#include <avr/io.h>
#include <util/delay.h>
#include <avr/sleep.h>
#include <avr/interrupt.h></p>
#define led1 0
#define led2 2
#define tus 1</p>
uint8_t isikModu = 0;</p>
ISR(INT0_vect) //This is needed even if it does nothing in brackets.
{} 
static void initTimers(void)
{
	TCCR0B |= (1<< CS00); //Saat prescale 1024  9.600.000/1
	TCCR0A |= (1 << COM0A1)| (1 << WGM01) | (1 << WGM00);
}
static void initADC2(void)
{
	ADMUX |=  (1<< MUX1) | (1<< MUX0); // ADC with referance of Vcc
	ADCSRA |= (1<< ADPS2) | (1<< ADPS1) | (1<< ADEN); //Prescaler = 64. 9.600.000 / 64 = 150000
}
static int adcOkuma(void) // adcRead function
{
	ADCSRA |= (1 << ADSC);
	while (ADCSRA & (1 << ADSC));
	return ADC;
}
static void parlaklikAyarlama(uint8_t x) // Setting the OCROA to control brightness
{
	OCR0A = x;
}
static void uykuModu(void) // Sleep mode
{
	cli();
	GIMSK |= (1 << INT0);
	ADCSRA &= ~(1 << ADEN);
	set_sleep_mode(SLEEP_MODE_PWR_DOWN);
	_delay_ms(10);
	sei();
	sleep_mode();
	GIMSK &= ~(1<< INT0);
	ADCSRA |= (1<< ADEN);
	loop_until_bit_is_set(PINB, tus); // This makes it wait until the button is released
	isikModu = 1;
	_delay_ms(10);
}
int main(void)
{
	uint8_t i;
	uint16_t esikDeger = 500;
	uint32_t sayac = 0, sayac2 = 0, sayac3 = 0, ortalama = 0;
	PORTB |= (1<< tus);
	initTimers();
	initADC2();
	CLKPR = 0b10000000;
	CLKPR = 0b00000010;
    while(1)
    {
		if (bit_is_clear(PINB, tus))
		{
			sayac++;
			if (sayac == 50000 && isikModu == 1)
			{
				cli();
				esikDeger = 0;
				isikModu = 5;
				for (i = 8; i != 0; --i)
				{
					esikDeger = esikDeger + adcOkuma();
					DDRB ^= (1<< led1);
					_delay_ms(100);
				}
				esikDeger = (esikDeger >> 3);
				isikModu = 1;
				sei();
			}
		}
		else
		{
			if (sayac > 1600 && sayac < 50000)
			{
				isikModu++;
				switch(isikModu) { // This switch statement assignes brightness level
					case 2:
						parlaklikAyarlama(255);
						break;
					case 3:
						parlaklikAyarlama(30);
						break;
					case 4:
						isikModu = 0;
						break;
				}
			}
			sayac = 0;
		}
		if (isikModu == 0)
		{
			DDRB &= ~(1<< led1);
			uykuModu();
		}
		else if (isikModu == 3)
		{
    		if (TCNT0 > 40)
    		{
    			sayac2++;
    			if (sayac2 > 5000)
    			{
    				sayac2 = 0;
    				DDRB ^= (1<< led1);
    			}
    		}
		}
		else if (isikModu == 2)
		{
			DDRB |= (1<< led1);
		}
		else if (isikModu == 1)
		{
			sayac3++;
			if (sayac3 == 30000)
			{
				for (i = 0; i <64; i++)
				{
					ortalama = ortalama + adcOkuma();
				}
				ortalama = ortalama >> 6;
				sayac3 = 0;
			}
			if (ortalama > esikDeger)
			{
				parlaklikAyarlama(30);
				sayac2++;
				if (sayac2 > 4000)
				{
					DDRB ^= (1<< led1);
					sayac2 = 0;
				}
			}
			else
			{
				parlaklikAyarlama(255);
				DDRB |= (1<< led1);
			}
		}
	}
}