//include file
#include <pic.h>

//16F84 configuration 
__CONFIG(0x3FF1);

//main function
void main(void)
{

	//this function generates a sine wave
	while(1)
	{
		//starts at 0
		
		PORTB=0b00010000; //start up 
		PORTB=0b10010000;
		PORTB=0b01010000;
		PORTB=0b11010000;
		PORTB=0b00110000;
		PORTB=0b10110000;
		PORTB=0b01110000;
		PORTB=0b11110000; //sine peaks
		PORTB=0b01110000; //back down
		PORTB=0b10110000;
		PORTB=0b00110000;
		PORTB=0b11010000;
		PORTB=0b01010000;
		PORTB=0b10010000;
		PORTB=0b00010000; //back at the center
		PORTB=0b11100000; //start down
		PORTB=0b01100000;
		PORTB=0b10100000;
		PORTB=0b00100000;
		PORTB=0b11000000;
		PORTB=0b01000000;
		PORTB=0b10000000;
		PORTB=0b00000000; //sine bottoms out
		PORTB=0b10000000; //back up
		PORTB=0b01000000;
		PORTB=0b11000000;
		PORTB=0b00100000;
		PORTB=0b10100000;
		PORTB=0b01100000;
		PORTB=0b11100000;
	      //PORTB=0b00010000; back to 0, commented out to prevent a pause

	}

}