Interfacing LEDs with 8051

Updated: Feb 23

In this #DIY project, you will learn how to interface #LEDs with an #8051microcontroller by simulating it on #proteus software.

Hardware Requirements - LEDs with 8051

a) 8051 microcontroller:

It is an 8-bit microcontroller built with 40 pins DIP, 4kb of ROM storage and 128 bytes of RAM storage, 2 16-bit timers. It was designed by intel in 1981. | LEDs with 8051 |

b) Resistors:

It is an electrical component that provides electrical resistance to a circuit. The circuit we are using consists of four 1K resistors and two 10K resistors.

c) Crystal Oscillator:

It is an electronic oscillator that uses the mechanical resonance of piezoelectric material to create an electrical signal of constant frequency. The circuit we are using consists of a crystal oscillator of 11.0952MHz frequency.

d) Capacitor:

It is a device that stores electrical energy in an electric field. The circuit we are using consists of two 33pF capacitors and one 10uF capacitor.

e) LEDs:

A light-emitting diode is a device that emits light when current flows through it.

Software Requirements

Proteus Design Suite:

It is a software used for electronic design simulation and automation.

Circuit Connections

Interfacing LEDs with 8051- circuit diagram

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Circuit connection involves the following steps:

An external crystal oscillator is connected to the microcontroller through pins 18 and 19.
Crystal pins are connected to the ground through the two 33pF capacitors.
LEDs are connected to the microcontroller through pins 0, 2, 4, and 6 of port 0 with 1k resistors in between.
Pin 31 of the microcontroller is connected to a 5V power supply through a 10k resistor.
Pin 9 of the microcontroller is connected to the ground through a 10k resistor and to 5V power through a 10uF capacitor.
A push-button is connected across the 10uF capacitor.

Code Explanation

The reg51 library is included and led pins are initialized.
A function for producing a delay is written using For loop.
In the void main() function code for the functioning of LEDs is written. Initially, all the LEDs are kept off.