Adapter PCB to support up to 3 panels

Supports up to three panel chains for newer plus models and Raspberry Pi 2 that have 40 GPIO pins.
Uses HCT245 to level shift signals from 3.3V to 5V and shield the Raspberry Pi GPIOs from overloading.
Open source KiCAD PCB EDA format.
(not very pretty layout, was just lazy and let the auto-router do it).
BOM:
- 4x HCT245 in 20-SOIC (7.5mm package)
- 4x 100nF ceramic capacitor
- 1x 10kOhm resistor.
- 3x 16pin IDC (=2x8) male receptible to connect the panels.
- 1x 40pin female connector to connect to the RPi.
The FAB files are provided as active-3-fab.zip

The board is also shared on OSH Park.