Page 57 - Making PIC Microcontroller Instruments and Controllers

CONTROLLING THE OUTPUT

AND READING THE INPUT

General

Alter all is said and done, itt abour the input and output, and what happens between
the two of them. It has to do with how we use the many capabilities piovided within
each PICA4CU, and how creative we are about using those capabilities. In this chapter
we sta leaming to use allthe input and output capabilities
Fovided on the l6FgtTA
using LAB-XI.
. All the programs we will be discussjng are provided on the support Web site
k.com $
as
rwwwencodergee ,. hich jr mrintained pan of rhi" book. Simlly nar igare to
your area ol intetest on the Web site.
You can copy the liles from rhe Web sire and run rhem on rhe 16F877Ain the LAB_XI.
The eiercises listed in each chapter are exercises that are designed to increase your
familiarity and competence with the 16F8?7A. The answeis to them arc not Drovide;_
Tn preparation
tor wriring programs. .et up $e L AB X I so ir can be prolrarned
wirh
one_mouse in derajt in App;dix A ot lhis
bunon clicl or b] prc.cing Ft0. as described
The yO that uses ICs in the seven empty sockets on the LAB_XI boatd is covered
sepantely in Chapters 7 and 8. These chapters also cover one_wire memory. A-to D con_
vefler.. and a numbef ol relaled thermometric de\ ices,
The VO that uses the sedal po{ (as RS-232 or RS485) is covercd in Chaprer 8. This
covers commrmications between pICs and personal computers,
We will leam about inpur and oulput b) fir,r q riting ri;ple progfams thar conrrol fie
outputs, and then wrire prcgrams that read ihe inputs. We will leam how to contlol
the outputs fust, because this can be done direcily from the sofh{are without need for anv
inpul.Once$econtrol
lbe ourpur. we $ ill ledrn ho$ lo rcdd lhe inpuls anJ mdke !h;
outputs respond to them in a useful and coherent manner The following is a list of the
prcgrams to be developed.