Page 154 - Making PIC Microcontroller Instruments and Controllers

DISPIAYS: EXTE DED I FORIIAIION nESOUBCE
146 USING LIQUID CRYSTAL A

]lole lye couu also use a ane Line (about $5) disPlq" brt thatflould inhibit leaming
abo t going to line 2, scn hg the disptq- up and (Iown, and sofb'lh To exryrin(:nt v itll
these Jeatures, we needto haNe a aisplaf Yritllat least trt'o Lines'

Settin Out Our Desi n Intent

a conrrol ihc 16 x 2 display with a Ptc 16F877A microconlroller (&l3 code fbr the
smaller MCUS wil be the same).
a Design the software so it can be an integrat part of thc software for any project ^
x Use;Endard control codes so lhe project is a virtual plug in replacement for
other displays ancl in other PlCs (Only minor modifications if any will be
required.)
r Usi a ninimum numbel of exlemal components, allowing this sotlwdre projecl to
nove between PIC controllers of all descriptions All we want to do is include the
code in our project and connect the display 10 the selccted ports-
x Usc the projecfs regulated 5_volt power supply foreverything-

trore The PIC l6F877A has 33 UO hes' the displal v'ill use 7 oI them' so t\te will
Sinc( we don1 need dll these lines Yre could hare
hdt e 26 tines left o|erJbr ov Projact.
Ltsel the 16F84A. No t)rogram changes shoukl be nee(led, otlrcr than changing the litE
addrcsses the DEFINES' \Nhen we tlot' to the PIC l6F81A
dn(l t)ott in

HARDWARE NEEDED
We will need lhe following pdts for this projecl:

, Experimental solde ess breadboard
! PIC microcontroller: 16F877Aor l6F84A
x One barc 2-line by-16 characler display module (with a Hilachi controllcr)
! One 4 MHz cryslal
a Two 22 Pf capacilors
! Rcgulated 5-voll power supply fron the brcadboad
s Onc 470-ohm 0.25 watt resistof
a Sone 22-gaugc insulatcd singlc stmnd hookup wire
t l-kohrn 0.12 watt pull up resislor

PROGRAMMEB T{EEDED
Thc programmer nceded should be cither thc microEnginee ng seial programmer' a
parallel prcgrammer, or the new USB programmer

SOFTWARE NEEDED
The sollware nccded includes lhc PICBASIC PRO Compiler and its nanual