Charlieplexed row of LED lights, for the Arduino

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:

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

Charlieplexed row of LED lights, for the Arduino

If you have any comments, questions &/or suggestions please ask them!


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

Main Points:
– 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

[box color=”#985D00″ bg=”#FFF8CB” font=”verdana” fontsize=”14 ” radius=”20 ” border=”#985D12″ float=”right” head=”Major Components in Project” headbg=”#FFEB70″ headcolor=”#985D00″]

Parts List:

– 12 LED’s; I’m using some 3 mm Red LED’s
– 4, 270 Ohm resistors; You can use other values as well
– Perfboard/Veroboard; I used a piece 27 holes x 5 holes
– Wire; I used some 26 gauge, solid core wire
– Header pins (optional)
– Arduino

– Soldering Iron
– Hot glue gun (optional)
– Helping hand (optional)


For more detail: Charlieplexed row of LED lights, for the Arduino

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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