LEDTest

This is a test of my charlieplexed display as described on my brand new blog http://tomscircuits.blogspot.com/.

It uses a Tiny13 controller with 5 I/O-ports and activates up to 4 LEDs simultaneously. There are transistors to drive the necessary current. In reality, there is no visible flickering. The display is bright enough for daylight conditions.

Category:

Science & Technology

Tags:

• charlieplexing
• electronics
• project
• LED
• avr
• tiny13

[tomfy44]

Thanks for the comment. About the different brightnesses: This is certainly an interesting problem. But I think that essentially you could deal with it just the same way as you would with a conventionally multiplexed LED matrix: Activate all LEDs of a group at the same time, deactivate them individually. Then, do the same with the next group.

[McGuywer]

This is great. I've never thought I should activate more than one LED at a time with ch.plexing. I knew it's possible, but I thought it's prohibitively difficult. Maybe if you have different duty cycles (different brightnesses) on LEDs, it stays difficult.

[tomfy44]

Thanks for your interest. The schematics plus further info can be found in my blog.

See the link on the right. It seems I can not post URLs in this comment.

[iamtheman3]

Great job, do you think you could send me the schematics?  Would be greatly appreciated :)