This is my instructable on charlieplexing a LED row/string with the arduino. I noticed that there weren’t many instructables on charlieplexing using an arduino, so i made this. I tried to keep the project simple, but that didn’t work very well. The soldering is complex, I wouldn’t recommend this as a first time soldering project.
Here’s some background on charlieplexing: en.wikipedia.org/wiki/Charlieplexing
I took about 80 pictures & not all of them made it into the main steps, but you can find them in step 9: Extra Pictures
Step 2: Solder the anodes of the LED’s
There’s not much to say about the next few steps, but there’s a few main points I’ll mention.
– The LED’s anodes are soldered in groups of 3
– Make sure the 4 groups don’t get joined together, but stay separate
The wires that connect the 4 groups are kind of shaped like a L.
Step 3: Bend the Cathodes
– You should end up with 4 different rows
– Make sure each of the the 4 rows contain only 3 connections to the cathodes & only one from each group of LED
For more detail: Charlieplexed row of LED lights, for the Arduino