#include <avr\io.h>
#include <avr\interrupt.h>
#include <avr/pgmspace.h>
char duty, count2, direction=0, temp, ach0, alarm_trigger=0;
unsigned int alarm_count=0;

ISR(TIMER0_COMPB_vect){
 OCR0B=duty;
	}

//interrupt for ADC
ISR(ADC_vect) 
{ 
ADMUX = 0x21;
ach0=ADCH;
ADCSRA |= (1 << ADSC); // enable next conversion
}

int main(void) {
DDRB=0x02;
//Output compare OC1A 8 bit non inverted PWM
ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // Set ADC prescaler to 128 - 125KHz sample rate @ 16MHz 

ADMUX |= (1 << MUX0); // set adc to adc1 (PB2)
ADMUX |= (1 << ADLAR); // Left adjust ADC result to allow easy 8 bit reading 

// No MUX values needed to be changed to use ADC0 


ADCSRA |= (1 << ADEN);  // Enable ADC 

ADCSRA |= (1 << ADIE);  // Enable ADC Interrupt 
sei();   // Enable Global Interrupts 

ADCSRA |= (1 << ADSC);  // Start A2D Conversions 



TCCR0A=0x21;
//start timer with 256 prescaler
TCCR0B=0x0B;
OCR0A=150;

duty=50;
//Output compare OC1A 8 bit non inverted PWM
//TCCR1A=0xA1;
//start timer with 256 prescaler
//TCCR1B=0x03;

//enable output compare interrupt for OCR1A
TIMSK=0x08;


for (;;)
{
	
	if ((PINB & 0x10) == 0){
	if (duty>=17){
	duty=17;}
	else{duty++;}
	}

	else if ((PINB & 0x08) == 0){
		if (duty<=4){
		duty=4;}
		else{duty--;}
		}
		
	else if (alarm_trigger==1)
	{
	duty=4;
	alarm_count++;
	if (alarm_count>=30000){
	alarm_trigger=0;
	alarm_count=0;
	}
	}

	else{
	duty=0;
	}
	
	if (ach0>=25){
	alarm_trigger=1;
	}

}

return 1;
}