7/17/2019 Interfacing Alphanumeric LCD to Parallel Port Using Visual Basic 6

http://slidepdf.com/reader/full/interfacing-alphanumeric-lcd-to-parallel-port-using-visual-basic-6 1/6

Interfacing Alphanumeric LCD to Parallel

Port using Visual Basic 6.0

Nimish Dave 2006nimishgmail.com

!ello "rien#s $ scrolling #o%n this page %ill let &ou learn a ver& eas& tutorial for

interfacing alphanumeric LCD '6(2 to parallel port of &our computer using Visual

Basic 6.0

Before staring %ith VB6 programming one shoul# )e clear %ith the concepts of the

parallel port. *efer this lin+ Parallel port tutorial.,ore information

Connection Diagram-

Caution-,a+e sure that V an# /ND lines are properl& connecte# other%ise &ou ma&

en# up in #amaging parallel port.

7/17/2019 Interfacing Alphanumeric LCD to Parallel Port Using Visual Basic 6

http://slidepdf.com/reader/full/interfacing-alphanumeric-lcd-to-parallel-port-using-visual-basic-6 2/6

If &ou %ant )ac+light than connect pin ' of LCD to V an# pin '6 of LCD to /ND.

B& a#usting '0+ resistor ma+e pin 1 of LCD at 0V. If connection are proper &ou %ill

see this after po%er on.

Pin Information of LCD-

Algorithm to sen# #ata to LCD-

'.,a+e *3 lo%

2.,a+e *450 if #ata )&te is comman#

*45' if #ata )&te is #ata 7A4CII value8

1.Place #ata )&te on #ata register

9.Pulse : 7!I/! to L;38

.*epeat the steps to sen# another #ata )&te

LCD Initiali<ation-

7/17/2019 Interfacing Alphanumeric LCD to Parallel Port Using Visual Basic 6

http://slidepdf.com/reader/full/interfacing-alphanumeric-lcd-to-parallel-port-using-visual-basic-6 3/6

=his is the pit fall for )eginners.Proper %or+ing of LCD #epen# on the ho% the LCD

is initiali<e#. 3e have to sen# fe% comman# )&tes to initiali<e the lc#. 4imple steps to

initiali<e the LCD

'.4pecif& function set-

4en# 1>! for >?)it@#ou)le line an# ( #ot character format.

2.Displa& ;n?;ff control-

4en# 0"! for #ispla& an# )lin+ cursor on.

1.:ntr& mo#e set-

4en# 06! for cursor in increment position an# shift is invisi)le.

9. Clear #ispla&-

4en# 0'! to clear #ispla& an# return cursor to home position.

N;=:-;ne must refer the #atasheet of LCD to get the proper time #ela& an# reuire#

seuence.

Clic+ here - Interface LCD %ith >0'

,aor hur#le in accessing parallel port in 3in#o%s p is the +no%le#ge of using

inpout12 files.Do%nloa# these files Driver files

No% save inpout12.#ll an# port.#ll in s&stem12 fol#er in %in#o%s #irector&.3e %ill

use certain su)routine provi#e# )& these #ll files in our VB6 co#e.;pen ne% proect in

VB6 an# create the form as sho%n )elo%.

7/17/2019 Interfacing Alphanumeric LCD to Parallel Port Using Visual Basic 6

http://slidepdf.com/reader/full/interfacing-alphanumeric-lcd-to-parallel-port-using-visual-basic-6 4/6

4et the ,a(length of t%o te(t)o(es to '6.Create 4tart an# Clear comman#

)utton.No% #ou)le clic+ on form an# cop& paste the co#e given )elo%.

Visual Basic Co#e

Dim #ata As Variant

Private 4u) ClearEClic+78

LowRsOut Val(&H378), Val(1) ' function to send data to parallel port

Enale

t!tlcd1"#e!t $ % % ' line 1 for Lt!tlcd"#e!t $ % % ' line for L

:n# 4u)

Private 4u) 4tartEClic+78

Out Val(&H37), Val(*np(&H37) nd &H+)lcdint

L-rite.trin/ t!tlcd1"#e!t

ne!tline ' function to set cursor to second lineL-rite.trin/ t!tlcd"#e!t

:n# 4u)

4u) Lo%*s78

Out Val(&H37), Val(*np(&H37) Or &H8) ' Rs Low

:n# 4u)

4u) Lo%:n78

Out Val(&H37), Val(*np(&H37) Or &H1) ' En Low

:n# 4u)

4u) !igh*s78

Out Val(&H37), Val(*np(&H37) nd &H+7) ' Rs Hi/0

:n# 4u)

4u) !igh:n78

Out Val(&H37), Val(*np(&H37) nd &H+E) ' En Hi/0

:n# 4u)

4u) lc#E%rite7#ataF8

Hi/0Rs

Out Val(&H378), Val(data)

Enale

:n# 4u)

7/17/2019 Interfacing Alphanumeric LCD to Parallel Port Using Visual Basic 6

http://slidepdf.com/reader/full/interfacing-alphanumeric-lcd-to-parallel-port-using-visual-basic-6 5/6

4u) ne(tEline78

LowRs

Out Val(&H378), Val(&H)Enale

:n# 4u)

4u) lc#Eint78 'suroutine to initiali2e L

LowRs

Out Val(&H378), Val(&H38)

EnaleLowRs

Out Val(&H378), Val(&H)

EnaleLowRs

Out Val(&H378), Val(&H)

EnaleLowRs

Out Val(&H378), Val(&H1)

Enale

:n# 4u)

4u) :na)le78

EL45. Hi/0En

EL45.

LowEn

EL45.

:n# 4u)

' function to send .** c0aracter one 6 one to L

Pu)lic 4u) LCD3rite4tring7B&Val ;ut4tr As 4tring8

i i s *nte/er 'write a strin/ to L+or i $ 1 #o Len(Out.tr)

lcdwrite (s(sc(id(Out.tr, i, 1))))

 9e!t i

:n# 4u)

No% go to ProectGA## ,o#ule .4elect inpout9.)as an# port.)as

7/17/2019 Interfacing Alphanumeric LCD to Parallel Port Using Visual Basic 6

http://slidepdf.com/reader/full/interfacing-alphanumeric-lcd-to-parallel-port-using-visual-basic-6 6/6

4u)routine ;ut Val 7Ha##ress8@ Val7#ata8 an# D:LAJ4 2000 is foun# in inpout4.bas

an#  port.bas respectivel&. *eferPC Interfaces Jn#er 3in#o%s

*unning the Program-

'.Press " to run the program

2.3rite the te(t &ou %ant to #ispla& on the LCD in the te(t )o(es

1.Clic+ 4tart comman# )utton.

9.ou %ill see that the same te(t appears on LCD as sho%n in the te(t )o(es.

.=o sen# other te(t clic+ Clear comman# )utton an# repeat the same proce#ure.