// Quick Demo of light sensor

// ------- Preamble -------- //
#define F_CPU 1000000
#include <avr/io.h>
#include <util/delay.h>

int returnValue(int i);

int main(void) {

	uint16_t PotVal;
	uint16_t LDRVal;
	DDRB=0xFF;
	PORTB=0x00;
	ADMUX |= (1 << REFS0);                  /* reference voltage on AVCC */
	ADCSRA |= (1 << ADPS2);                   /* ADC clock prescaler /16 */
	ADCSRA |= (1 << ADEN);                                 /* enable ADC */

	// ------ Event loop ------ //
	while (1) {
		LDRVal = returnValue(1);
		PotVal = returnValue(0);


		if(LDRVal > PotVal) {
			PORTB |=(1<<PB1);
			PORTB |=(1<<PB2);
			PORTB |=(1<<PB3);
		}
		else {
			PORTB &= ~(1<<PB1);
			PORTB &= ~(1<<PB2);
			PORTB &= ~(1<<PB3);
		}
		_delay_ms(50);
		}                                                  /* End event loop */
		return (0);                            /* This line is never reached */
	}

	int returnValue(int i){
		ADMUX &=~(0<<MUX0) | ~(0<<MUX1) | ~(0<<MUX2) | ~(0<<MUX3);
		if(i) ADMUX |=(1<<MUX1);
		ADCSRA |= (1<<ADSC) | (1<<ADIF);
		while(~ADCSRA & 1<<ADIF);
		int returnval=ADC;
		return returnval;

	}