Interfacing one Led to 8051 Micro-controller
Description About Interfacing Led to 8051
Led is a simple 1 bit out put device. So we need only one bit(or pin) to operate it.
Led can be configured as active low(i.e Glow when pin is Low ) or It can be configured as
active high(i.e Glow when pin is High).
In above figure it is configured as active low. So For Glowing of led the bit must be 0
and 1 for off the led.
Code for The Above configuration
#include "./include/reg51.h" /*contain 8051 specific definition*/
#include "./include/delays_header.h" /* contain delay generation declaration*/
/*AS LED IS CONFIGURED AS A NEGATIVE LOGIC DEVICE */
#define ON 0
#define OFF 1
sbit LED1=P0^0;
void main()
{
while(1)/*super loop for embedded application*/
{
LED1=ON;
/*provide some delay so that led in ON state for some time*/
delay_500_ms();
LED1=OFF;
/*provide some delay so that led in OFF state for some time*/
delay_500_ms();
}
}