Vlad,
 I have similar project - timer.
 4 7 segment LEDs.
 You may see assembler with comments.

http://www.radier.ca/pic/pictimer.php

Dmitriy

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Vlad
Sent: February 9, 2004 3:46 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC:] multiplex 7seg LED with drivers


Hello folks,

I'm in the process of designing a toy circuit to keep track of life
counters for various games.  It should support 3 players.  Each player
will have two 7 segment LED displays that will display a number between
0-99, and also 2 switch buttons that will be used to increase and
decrease the number displayed on these LED displays.

I have a handful of 16f84 PIC's and currently learning how to program
them.  With only a limited number of input/output pins on this chip
(13 I believe) what would be a good way to allocate these pins for the
switch buttons and displays?

I have read various articles in the Usenet archives which suggest
multiplexing displays, this requires 7 pins for each segment and 1
pin for every other display.  I think this will eat up in to all my
pins though.  Can I use the same multiplexing technique with a single
display/driver chip?  Any suggestions?  Also any thoughts on the switches?

This is my first electronics project and PIC programming project
(ambitious, yes)

Thanks
-v

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body