automatic door lock.c

#include<reg51.h>
sbit sensor=P1^0;
sbit relay1=P1^1;
sbit relay2=P1^2;
void delay();
void main()
{
	relay1 = 0;
	relay2 = 0;
	while(1)
	{		
		if(sensor == 0)
		{
			relay1 = 1;
			relay2 = 0;	// motor rotates clockwise opening the door
			delay();
			relay1 = 0;
			relay2 = 1; // motor rotates anticlockwise closing the door
			delay();
			relay1 = 0;
			relay2 = 0;
		}
	}
}
void delay()
{
	unsigned int i, j;
	for(i = 0; i < 3; i++)
		for(j = 0; j < 60000; j++);
}