PCB adapter for Raspberry Pi to Hub75 RGB Matrixes
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Since hand-wiring can be a little tedious, here are some PCBs that help
with the wiring when using the `rpi-rgb-led-matrix` code.

   * [Passive-3](./passive-3) Supports three parallel chains, directly connected
     to the output of a Rapsberry Pi with 40 GPIO pins. Works, but usually it is better to
     buffer the outputs using the ...
   * [Active-3](./active-3) board. Supports three parallel chains with active buffering
     and 3.3V -> 5V level shifting for best reliability. Requires SMD soldering.
   * The [Passive-RPi1](./passive-rpi1) adapter board is to connect one panel to
     Raspberry Pi 1 with 26 GPIO pins.

![Three Panels connected][three-panels]

[three-panels]: ../img/three-parallel-panels-soic.jpg
