2 layers

Openoshi lightboard
seventhsu/openoshi
A fully open-source, DIY concert penlight.
29 parts1CERN-OHL-S-2.0
Printed circuit boards designed in KiCad and published on GitHub, each with its parts, layers and size, its README and its files; open any of them in PCBKit.

seventhsu/openoshi
A fully open-source, DIY concert penlight.