Interfacing Techniques in 8051

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 Interfacing is one of the important concepts in microcontroller 8051 because the microcontroller is a CPU that can perform some operation on a data and gives the output. However to perform the operation we need an input device to enter the data and in turn output device displays the results of the operation. Here we are using keyboard and LCD display as input and output devices along with the microcontroller.

Interfacing is the process of connecting devices together so that they can exchange the information and that proves to be easier to write the programs. There are different type of input and output devices as for our requirement such as LEDs, LCDs, 7segment, keypad, motors and other devices.

Here is given some important modules interfaced with microcontroller 8051.

1. LED Interfacing to Microcontroller:

Description:


LEDs are most commonly used in many applications for indicating the output. They find huge range of applications as indicators during test to check the validity of results at different stages. They are very cheap and easily available in a variety of shape, color and size.


Light Emitting Diode



Light Emitting Diode

The principle of operation of LEDs is very easy. A simple LEDs also servers as a basic display devices, it On and OFF state express meaning full information about a device. The common available LEDs have a 1.7v voltage drop that means when we apply above 1.7V, the diode conducts. The diode needs 10mA current to glow with full intensity. 

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