Case and enclosure
hardware/case/ holds a 3D-printable case for the Communicator badge: a remix of the stock case with
room for an ATGM336H GPS module and its wiring, so you can carry the badge with GPS attached instead
of leaving the receiver loose. The bay predates the move of the GPS default off J6 and fits either
routing.
The file
Section titled “The file”hardware/case/communicator-gps-case.stl is the printable model. It was drawn in SketchUp and
exported as a binary STL with 2,846 triangles.
Print it at full size in PLA or PETG
Section titled “Print it at full size in PLA or PETG”The model is in millimetres, so slice it at full size and do not scale it. The outer footprint is about 148 x 175 mm and the walls stand 8.5 mm tall.
The STL carries no print settings of its own, so slice it for your own printer and filament. PLA or PETG both work for a badge you carry indoors. Look at the orientation in your slicer preview before you commit to supports.
Wire the module to the SAO spare GPIO pair
Section titled “Wire the module to the SAO spare GPIO pair”The bay is sized for the common ATGM336H breakout. The firmware default is the SAO spare GPIO pair: module TX to SAO_GPIO1 (GPIO7), module RX to SAO_GPIO2 (GPIO6), plus 3V3 and GND. GPS is on by default, so a reboot after wiring is all it needs.
Neither expansion header is populated from the factory, so you solder the header or the wires yourself. The J6 alternative, and the IO12 pad that is easy to misread as “IO10”, are in the GPS app page.