INTERFACING 16×2 LCD WITH 8051

By:Rao Usama, Waqar Qureshi, Naveed Ahmed, Mazhar Khan, Niaz Khoso

Introduction:

This project is about to interface 16x2 LCD with 8051 microcontroller that displays different kind of syntax like names of each group member by a program written in assembly language with the support of 8051 microcontroller that directs LCD through its commands. LCD display is an inevitable part in almost all embedded projects and this article is about interfacing 16×2 LCD with 8051 microcontroller. Many guys find it hard to interface LCD module with the 8051 but the fact is that if you learn it properly, its a very easy job and by knowing it you can easily design embedded projects like digital voltmeter / ammeter, digital clock, home automation displays, status indicator display, digital code locks, digital speedometer/ odometer, display for music players etc etc. Thoroughly going through this article will make you able to display any text (including the extended characters) on any part of the 16×2 display screen.

Working:

This project is about to interface a 16×2 LCD with a programmable device called 8051 microcontroller that is an assembly and C language support device . This project will work in such a way that it will display the names of each group member . And when this syntax come to an end it will start counter from 0 to 9 that can be used in different applications . E.g: Parking stations etc . However the program in microcontroller is an assembly language based.

Assembly Code:

ORG 00H ACALL LOOP MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'G' ACALL DATAWRT ACALL DELAY MOV A, #'R' ACALL DATAWRT ACALL DELAY MOV A, #'O' ACALL DATAWRT ACALL DELAY MOV A, #'U' ACALL DATAWRT ACALL DELAY MOV A, #'P' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'N' ACALL DATAWRT ACALL DELAY MOV A, #'0' ACALL DATAWRT ACALL DELAY MOV A, #':' ACALL DATAWRT ACALL DELAY MOV A, #'3' ACALL DATAWRT ACALL DELAY ACALL LOOP MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'1' ACALL DATAWRT ACALL DELAY MOV A, #'8' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'E' ACALL DATAWRT ACALL DELAY MOV A, #'S' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'2' ACALL DATAWRT ACALL DELAY MOV A, #'2' ACALL DATAWRT ACALL DELAY ACALL LOOP MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'1' ACALL DATAWRT ACALL DELAY MOV A, #'8' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'E' ACALL DATAWRT ACALL DELAY MOV A, #'S' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'3' ACALL DATAWRT ACALL DELAY MOV A, #'9' ACALL DATAWRT ACALL DELAY ACALL LOOP MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'1' ACALL DATAWRT ACALL DELAY MOV A, #'8' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'E' ACALL DATAWRT ACALL DELAY MOV A, #'S' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'2' ACALL DATAWRT ACALL DELAY MOV A, #'1' ACALL DATAWRT ACALL DELAY ACALL LOOP MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'1' ACALL DATAWRT ACALL DELAY MOV A, #'8' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'E' ACALL DATAWRT ACALL DELAY MOV A, #'S' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'2' ACALL DATAWRT ACALL DELAY MOV A, #'0' ACALL DATAWRT ACALL DELAY ACALL LOOP MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'1' ACALL DATAWRT ACALL DELAY MOV A, #'8' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'E' ACALL DATAWRT ACALL DELAY MOV A, #'S' ACALL DATAWRT ACALL DELAY MOV A, #'*' ACALL DATAWRT ACALL DELAY MOV A, #'1' ACALL DATAWRT ACALL DELAY MOV A, #'6' ACALL DATAWRT ACALL DELAY ACALL LOOP MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #' ' ACALL DATAWRT ACALL DELAY MOV A, #'C' ACALL DATAWRT ACALL DELAY MOV A, #'O' ACALL DATAWRT ACALL DELAY MOV A, #'U' ACALL DATAWRT ACALL DELAY MOV A, #'N' ACALL DATAWRT ACALL DELAY MOV A, #'T' ACALL DATAWRT ACALL DELAY MOV A, #'E' ACALL DATAWRT ACALL DELAY MOV A, #'R' ACALL DATAWRT ACALL DELAY ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'O' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'1' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'2' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'3' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'4' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'5' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'6' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'7' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'8' ACALL DATAWRT ACALL LOOP MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #' ' ACALL DATAWRT MOV A, #'9' ACALL DATAWRT LOOP: MOV A, #38H ACALL COMNWRT ACALL DELAY1 MOV A, #01H ACALL COMNWRT ACALL DELAY1 MOV A, #0EH ACALL COMNWRT ACALL DELAY1 MOV A, #80H ACALL COMNWRT ACALL DELAY1 COMNWRT: MOV P2, A CLR P1.7 CLR P1.6 SETB P1.5 ACALL DELAY CLR P1.5 RET DATAWRT: MOV P2, A SETB P1.7 CLR P1.6 SETB P1.5 ACALL DELAY1 CLR P1.5 RET DELAY: MOV R2,#5 HERE1:MOV R3,#100 HERE2:MOV R4,#250 HERE6: DJNZ R4, HERE6 DJNZ R3,HERE2 DJNZ R2,HERE1 RET DELAY1: MOV R1,#0 HERE3: DJNZ R1,HERE3 RET END

Downloads
Schematic
Code
Hex Code