/*  Name     : main.c
 *  Purpose  : Source code for Servo Motor Interfacing with AT89C52.
 *  Author   : Gemicates
 *  Date     : 2014-01-19
 *  Website  : www.gemicates.org
 *  Revision : None
 */

                                                         // Program to rotate servo by 5 degree from previous position starting from 0 degree

                                                         // 0 degree = 700us 
                                                         // 180 degree = 5500us 
                                                         // Timer1 pulse after 50us	-23

#include <REGX52.H>
sbit output=P1^0;  		                                 // Output to motor
int count; 
        
void delay(unsigned int msec)                            // Function for delay
{ 
	int i,j;
	for(i=0;i<msec;i++)
		for(j=0;j<1275;j++);
} 

void timer(int msec)	                                 // Function for timer
{
	int i;
	TR1=1;
	for(i=0;i<msec;i++)
	{
		while(TF1==0);
		TF1=0;
	}
	TR1=0;
}
void main()
{
	int i;
	TMOD=0x20; 		                                    // Mode2
	TH1= -23;		                                    // 50usec timer
	output=0;
	count=14;
	while(1)
	{
		if(count>=100)
			count=14;
		else
			count=count+5;
		for(i=0;i<200;i++)
		{
			output=1;
			timer(count);		 
			output=0;
			timer(360);
		}	
		delay(100);	
	}
}