We needed some edge lightning for an edge-lit sign we are making for #HackBergen hackerspace.
To make the sign easier to make I would like the LEDs to be on a strip which is as slim as possible. NeoPixel strips+chips for sale appear to be 10mm or wider. However ws2812b 5050 chips are 5mm wide, allowing me to create a custom LED-strip covering the 4mm acrylic inlays avoiding excess.
I also wanted to have some control over placement as the letters on the sign are not all the same size and the spacing is not even. I could of course design & etch a PCB or have someone make one professionally, but it turns out it is fairly easy to make small DIY strips with perfboard.
From another member of HackBergen I got some rolls of the bare ws2812b chips. I already had perfboard, and wanted to connect them to the awesome SparkCore. The SparkCore has 3.3V logic and ws2812b´s need >3.7V. So I had to level up the output from the SparkCore for the ws2812b´s to function properly.