LED Interfacing With 8051 Micro-Controller.

What is an LED?

The full form of LED is light-emitting diode. It is a small and Powerful light used in various applications.

Image And Symbol of LED:-


What is the current Sourcing?


When a device supplies current to a connected load, it is known as current sourcing. For example, when an LED and a resistor are connected between the microcontroller and ground, setting the pin logic (1) to turn on the LED and (0) to turn off the LED.


What is the current Sinking?

Current sinking is when the power passes to the load and then to the object. Eg. When an LED and a resistor are connected between the power supply setting pin, logic that (0) turns on the LED and (1) turns off the LED.

Task 1: Turn on the LED connected to the 8051 microcontroller.

Code:-

#include<reg51.h>
sbit led=P2^0;
void main()
{
led=1;
while (1)
{
led=0;
}
}

Output:-


Task 2: Blink the LED connected to the 8051 microcontroller.

Code:-

#include<reg51.h>
sbit led=P2^0;
void delay(unsigned int t);
void main()
{
led=1;
while (1)
{
led=0;
delay(1);
led=1;
delay(1);
}
}
void delay (unsigned int t)
{
int i,j;
for (i=0;i<=100*t;i++)
{
for (j=0;j<1257;j++)
{
}
}
}

Output:-