We’ve seen our share of light-up jewelry over the years, but for some reason — probably power — it’s almost always earrings or necklaces. So when we saw [ROBO HUB]’s LED ring ...

Learn how to create a DIY LED ring light for potentiometer/rotary encoder and Arduino, driven by MAX7219 multiplexing chip. I will create a custom PCB in KiCad, and order it together with SMD assembly ...