problem interfacing at89c51,adc0804 and displaying on LCD

[pandeeey]

i am a third year engineering student,i am doing my project on temperature control and monitoring syestem,i have used adc0804 for a/d conversion and 89c51 microcontroller with delay of 10 seconds,need display it on a lcd with 2 lines one for displaying monitored temperature and the other one to input the required temperature ......i am facing problem with assembly language programming,i want to check my program using proteus,but i dont know how to use it.can someone mail me the codes for interfacing... plz help me.......

 

[the_balistic]

Re: problem interfacing at89c51,adc0804 and displaying on LC

It's been a long time since i used assemble, try using basic or c it will be more easy

and quick , but still i had it for my last experiment please check the code. I use mide for compile it

http://www.opcube.com/home.html it's free and great software can compile assembler and c (sdcc)

$TITLE(ADC and LCD)
$MOD51
		DSEG
		ORG	0030H
hundreds	equ	 031h			;Buffer for hundreds for data adc
tens    	equ  032h			
unit        equ  033h
;
        CSEG
       	org 0100h
start: 	
        lcall init_lcd 
        lcall ADC
       	lcall Bin2Dec
       	
       	mov r1,#80h
       	call Write_inst    ; this means move cursor to line 1 lcd if you want to use line 2 lcd use C0H
       	mov r1,hundreds
       	call Write_data
       	mov r2,tens
       	call Write_data
       	mov r1,unit
       	call Write_data
sjmp start
;
;=================================================
;Subrutine ADC for get adc data(use free running ADC mode)
; ADC port using port 1
; WR ADC port 3.3
; RD ADC port 3.4
; CS ADC connect to ground
;=================================================
ADC:	
    clr P3.3
	nop
	nop
	nop
	setb P3.3
eoc:	
    jb P3.2,eoc
	clr P3.4
	mov A,P1
	setb P3.4
	ret	
;
;==================================================
;Subrutin to convert Binary Data to Decimal Data
; example 254 ==> hundreds = 2, 5 = tens and 4 = unit
;==================================================
Bin2Dec:
       mov b,#100d
       div ab
       mov hundreds,a
       mov a,b
       mov b,#10d
       div ab
       mov tens,a
       mov unit,b
       ret     
       
;========================================
; Subroutine LCD initialization ( iuse lcd x x 16)
;========================================         
Init_lcd:
    mov r1,#00000001b ;Display clear
    acall write_inst  ;
    mov r1,#00111000b ;Function set,
                      ;Data 8 bit,2 line font 5x7
    acall write_inst  ;
    mov r1,#00001100b ;Display on, 
                      ;cursor off,cursor blink off
    acall write_inst
    mov r1,#00000110b ;Entry mode, Set increment
    acall write_inst
    ret

;==========================================
; Subroutine Write command to LCD
;=========================================
Write_inst:
    clr P2.0  ; RS = P2.0 = 0, write mode instruction
    mov P0,R1 ; D7 s/d D0 = P0 = R1
    setb P2.1 ; EN = 1 = P2.1 
    call delay; call delay time
    clr P2.1  ; EN = 0 = P2.1
    ret

;========================================
; Sub routine write data to lcd
;========================================
Write_data:
    setb P2.0 ; RS = P2.0 = 1, write mode data
    mov P0,R1 ; D7 s/d D0 = P0 = R1
    setb P2.1 ; EN = 1 = P2.1
    call delay; call delay time
    clr p2.1  ; EN = 0 = P2.1
    ret
    
;=============================
; Delay Subroutine
;============================
delay: 	mov R0,#0ffh
delay1:mov R7,#0ffh
       	djnz R7,$
       	djnz R0,delay1
       	ret

end

check the schematic

1. ADC schecmatic


2. LCD schematic


hope this help u

for more information u can visit this website
http://www.mytutorialcafe.com great tutorial from INDONESIA you'll love it


DENY (Bodat'z)

 

[junior_naik]

Re: problem interfacing at89c51,adc0804 and displaying on LC

brothrs i need some help regarding interfacing ADC0804 and AT89c51
i connected lm35dz temp sensor to adc0804(i am using the same code and circuit diagram ,which in mazeedi 8051 programming/actually when ever i send low to read pin of ADC0804 to get the converted data out,it causes my program execution to stop and other functions doesn't execute .but if i skip the execution of that command, to low the read pin of my ADC the prog executes rightly but it doesn't convert temp into binary.(i know why)
plz hlp me.