Could anyone help me about charlieplexing

HTAluvBeBeo · Joined: 23 Feb 2008 Posts: 35

I still do not understand how to dive up to seven 7-segment leds.
Could any one explain it for me ?
May be a flowchart or source code could help me more.
Thank for reading this topic.

dyeatman · Joined: 06 Sep 2003 Posts: 1933 Location: Norman, OK

It would help if you use Google.

Here is a very good site that fuly explains Charlieplexing.
http://www.instructables.com/id/Charlieplexing-LEDs--The-theory/

And here is one on driving 7 Segment LEDs
http://www.maxim-ic.com/appnotes.cfm/appnote_number/1880

HTAluvBeBeo · Joined: 23 Feb 2008 Posts: 35

oh yeah thank you, something is more clear.
After time at university, I will read carefully.
But it seems I will have to config TRIS? many times
With my CA 7seg leds, I will need to set output 1 for Anode, 0 for segments which are lit and input high z with segments which are not lit.
So interesting
If anyone have a sample code for this, it will be more easy for my hobby.
Thank you all so so much.