Sometimes you might wonder about driving an array of LEDs with just a few number of I/O pins – either because that’s all that’s available or because you want to challenge yourself to figure it out. Charlieplexing is one solution and this post will help you think through the basics of it, using electronic dice to explain the concept:
I recently bought a very low cost electronic dice kit on an impulse. Assembling it was good retro-fun for a while. The circuit design is was purely 70ies style: A CD4017, a NE555 and a couple of transistors. Of course, this got me thinking: How would it be done today in a most efficient way? Of course this means using a microcontroller, and, of course this means using as few resources as possible. Will an ATiny10 with 3 I/Os pins do?
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — The Prepared Podcast – Jonathan Cedar, BioLite
Wearables — Start with a sketch
Electronics — My signal isn’t THAT noisy, is it?
Biohacking — Fine Tuning Fluorescent Dyes
No comments yet.
Sorry, the comment form is closed at this time.