Hi Thomas,
I have developed a 20 Character 7x5 dot matrix display (yes 700 leds)
that runs from an F876 (or C63!).  I have the 5 columns driven with
Darlington transistors, and use shift registers for the rows. This is a
total of 7 pic pins, or 8 if you use a shift register with a latch.  My
display routine gets any serial data during the on-time, and has plenty
of time to decode this in my character generator routing. The data is
rs232 at 9600 baud, and I have dozens of these installed in industrial
premises here in oz with no failures to date, and they have been running
now for 4 years.  One more note, use the daylight viewable led displays
for better viewing in all conditions.

Regards
Glendon


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Thomas N
Sent: Thursday, 12 June 2003 11:03 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: Driving LED Matrix Display from a PIC

Hi everyone,

With 32 I/O from the 16F877, I think I can control a 16x16 LED matrix
display.  Because of the limited current coming out from the I/O, I
don't think a PIC can drive the LEDs directly.  Is there a driver IC or
something to drive the LEDs?  Is there a better way to do this?

Thank you in advance!

Thomas


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