Interfacing LEDs with PIC microcontroller using MpLab and Proteus / Interfacing LEDs with PIC microcontroller using PIC18F458

  Interfacing LEDs with PIC microcontroller 

      Objectives:

• To create a program to interface LEDs with PIC microcontroller Introduction and Familiarization with Proteus software.
• Basic Understanding of how to install and create project in Proteus.
• To interface LEDs with PIC microcontroller using Assembly language.

Introduction:

PIC is a peripheral interface microcontroller developed by General Instruments Microcontrollers in 1993. It is controlled by software and programmed in such a way that it performs various functions and controls the generation line. PIC microcontrollers are used in a variety of new applications such as smartphones, audio accessories and modern medical devices.PIC microcontroller are electronic circuit that can be programmed to carry out a vast range of tasks. They can be programmed to be timers or to control a production line and much more. They are found is most electronic devices such as alarm system, computer control system, phones in fact almost any electronic device.

Commands

Clrf = Clear f

EQU = Equates to

ADDLW = Add literal value to WREG

MOVLW = Move literal value to WREG

MOVWF = Move WREG to file

DECF = Decrement F

DECFSZ = Decrement F, skip if zero

BNZ = Branch if not zero

GOTO = Go to address first word

I create a new project in MPLABx IDE and select the Pic family chip PIC18F458 and  also I embed the PIC18F458 Library code in MPLABx IDE.

Procedure 

• First I write a code in MPLAB X IDE to glow a single LED
• Then I save the program and open the Proteus software to draw the circuit diagram.
• The components we used are DC Power Supply, PIC18F458 Chip and Ground and make their required connections respectively using wire.
• And then I copy the code that I make in MPLAB X IDE and embedded or paste it in the circuit that we made on Proteus.
• At last I press the run button on Proteus and LED’s starts glowing which justifies the understanding and performance of my today’s lab.

Program Code:

 CounterA equ 24H

 CounterB equ 25H

 CLRF TRISB; 33, 35, 37

 MOVLW d'1'

 MOVLW d'21'

 MOVWF PORTB

Ø First of all we write a code in mplab and save a exe file

Ø After that we install exe file in PIC18F458

Ø After install file run the simulation file