#define F_CPU 1000000UL //1Mhz
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include <stdlib.h>

int main (void){
    DDRB |= 1 << PINB0; // set LEDRed as output
    DDRB |= 1 << PINB1; // set LEDYellow2 as output
    DDRB |= 1 << PINB2; // set LEDYellow1 as output
    DDRB |= 1 << PINB3; // set LEDGreen2 as output
    DDRB |= 1 << PINB4; // set LEDGreen1 as output

    //ADC prescaller, needs to be from, 50KHz to 200KHz, 16 prescale
    //1 000 000 Hz / 50 000 hz = 20 or 1 000 000 Hz / 200 000 Hz = 5
    ADCSRA |= 1 << ADPS2;
    //8-bit Results 0 - 255
    ADMUX |= 1 << ADLAR;
    //Set AREF = AVCC with external capacitor at AREF pin
    ADMUX |= 1 << REFS0;
    //Enable ADC interrupts
    //ADCSRA |= 1 << ADIE;
    //Turn on ADC
    ADCSRA |= 1 << ADEN;
    //Enable global interrupts
    sei();
    //Start conversion
    ADCSRA |= 1 << ADSC;

    while(1){
        if(ADCH < 100 && ADCH > 20){
            PORTB |= 1 << PINB0;
            _delay_ms(500);
            ADCSRA |= 1 << ADSC;
        }
        PORTB &= ~ 1 << PINB0;
    }
}