For my current project I am using a G400-S. I connected all GND pins and VCC pin 84 with 3.3V but unfortunately the module doesn’t show up as usb device when connected to my pc. Is there some sort of basic schematic for this module to start with?
Best regards, Florian
@ altbrot - The G400S requires additional voltages beyond 3.3V (which it requires on two pins actually). https://www.ghielectronics.com/downloads/man/G400-S_Module_Brochure.pdf has details on what pins need what voltages. You can also take a look at the FEZ Raptor schematics as a reference.
@ John - Thanks for your reply. As a matter of fact I am more a software kind of guy - not hardware 
Besides, GHI Products are great, and this forum provides valuable information in no time - thanks and keep it up people !!!