Temperature of surrounding is sensed by temperature sensor and it send it's o/p as DC voltage to Analog to digital Converter 0808 through which we give 8 bit value of that voltage to microcontrller 8051.After it's processing it is displayed in LCD ...
ASSEMBLY LANGUAGE PROGRAM FOR
WEATHER MONITORING SYSTEM
USING:: 1. MICROCONTROLLER 89C61X2
2.ADC 0808
3. TEMPERATURE SENSOR LM35D
;================================================= ==============;
org 0000h
BEGIN:
mov A,#38h ;initialie 2 line LCD
ACALL command
mov A,#0ch ;LCD on cursor off
ACALL command
mov A,#01h ;clear LCD
ACALL command
mov A,#06h ;Shift cursor right
ACALL command
mov A,#'T'
ACALL DISPLY
mov A,#'E'
ACALL DISPLY
mov A,#'M'
ACALL DISPLY
mov A,#'P'
ACALL DISPLY
mov A,#'='
ACALL DISPLY
ACALL ADC
ACALL BINTOASC
;;;;;;;;;;;;;;;;;;;;;DISPLAY ASCII NUMBERS;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
mov A,#06h ;Shift cursor right
ACALL command
mov A,34h ;Disply MSb of ASCII
ACALL DISPLY
mov A,#06h ;Shift cursor right
ACALL command
mov A,33h ;Display middle ASCII
ACALL DISPLY
mov A,#06h ;Shift cursor right
ACALL command
mov A,32h ;DISPLAY LSb ASCII
ACALL DISPLY
mov A,#'d'
ACALL DISPLY
mov A,#'C'
ACALL DISPLY
acall delay
acall delay
acall dac ;for analog conversion;;;;
acall delay
sjmp BEGIN ;Jump to the top repeat the whole process
;;;;;;;;;;;;;;;;;;;TO INITIALIZE LCD BY;;;;;;;;;;;;;;;;;;;
command:
ACALL READY ;Is LCD ready
mov p0,A ;Issu command
clr p2.7 ;RS=0 for comand instruction
clr p2.6 ;R/W=0 to write LCD
setb p2.5 ;H->L for to latch information in at data lines
clr p2.5
ret
;;;;;;;;;;;;;;;;;;TO DISPLAY USER DATA;;;;;;;;;;;;;;;;;;;;;
DISPLY:
ACALL READY
mov p0,A ;Issu data
setb p2.7 ;RS=1 for data
clr p2.6 ;R/W=0 to write LCD
setb p2.5 ;H->L for to latch information in at data lines
clr p2.5
ret
;;;;;;;;;;;;;;;;;TO CHECK LCD READY TO RECIEVE DATA TO SHOW;;;;;;;;;;;;;;;;;;;;;;;;;
READY:
setb p0.7
clr p2.7 ;RS=0 for command register
setb p2.6 ;R/W=1 to read command register
BACK:
clr p2.5 ;H->L to latch the data
setb p2.5
jb p0.7,BACK ;Busy flag(P1.7)=1 indicates LCD is not ready to recieve data
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;READS ADC DATA;;;;;;;;;;;;;;;;;;;;;;
ADC:
mov p1,#0ffh ; taking port p1 As data input port
clr p3.2 ;L->H for ALE enable
clr p3.5 ;clr sc
setb p3.3 ; for eoc
setb p3.2 ; for ale
clr p3.4 ;oe pin
clr p3..2
setb p3.5 ;SC=1->0
nop
clr p3.5 ;H->L to start conversion
WAIT:
JB p3.3,WAIT ;Wait for end of conversion EOC
setb p3.4 ;OE 1->0 to enable output from ADC
acall delay
mov A,p1 ;Read data
MOV 35H,A
setb p3.4 ;To disable read to start next conversion
setb p3.3 ;eoc
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;BINARY TO ASCII CONVERSION;;;;;;;;;;;;;;;
BINTOASC:
mov A,35h ;Input from ADC
mov B,#10 ;Divide by 10
div AB
mov r0,B ;Move remainder into R0
mov B,#10
div AB ;Divide quatient by 10
mov r1,b ;Move remainder in R1
mov r2,A ;Move quatient in R2
mov A,r1 ;Move second BBCD in A
swap A
orl A,r0 ;OR 3rd & 2nd BCD to form compact BCD
mov 30h,A ;Saves 2nd&3rd BCD at RAM location 30h
mov 31h,r2 ;Saves 1st BCD at RAM location 31
;;;;;;;;;;;;;;;;;;;;;;;;;;CONVERTION FROM BCD TO ASCII;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
mov A,30h ;Takes 2nd&3rd BCD from RAM location 30h
ANL A,#0fh ;Mask the upper NIBBLE
orl A,#30h ;Convert lower nibble in ASCII
mov 32h,A ;Save MSb ASCII at RAM location 32H
mov A,30h ;Move BCD into A from RAM location 30H
anl A,#0f0h ;Mask lower NIBBLE of BCD
swap A ;Interchange lower and higher NIBBLE
orl A,#30h ;Convert it in ASCII
mov 33h,A ;Save 2nd ASCII at RAM location 33H
mov A,31h ;Takes 1st BCD from RAM location 31H
anl A,#0fh ;Masks upper nibble
orl A,#30h ;COnvert into ASCII
mov 34h,A ;Saves MSb ASCII at RAM location 34H
ret
;;;;;;;converting data into analog form again;;;;;;;;;;;;;
dac:
mov a,35h
mov p1,#00h ;port p1 as o/p port
setb p3.7 ;dac write pin
acall delay
mov p1,a
acall delay
;clr p3.7
ret
;;;;;;;dealay required for program;;;;;
DELAY: mov r0,#255
loop1: mov r1,#255
LOOP:djnz r1,loop
djnz r0,loop1
ret
end
Hi do you have a working circuit where I can apply this code ?
ReplyDeleteIs this code working please let me know
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ReplyDeleteI attached lcd on port 1 n ADC on port2
ReplyDelete