USB devices using more than 100 mA had to be connected via a powered hub. The original Model B board had current limiting polyfuses which limited the power output of each USB port to approximatly 100 mA. Model B Hardware Revisions and USB Power limits Hardware Revision 1.0 There is a Wiki section about this issue which is worth a read. If the Raspberry Pi's supply voltage falls below a certain value (anecdotally stated as around 4.75 V), or it begins to fluctuate, your setup may become unstable. If you are adding to a product list it would help clarity if entries are kept/added in alphabetical order.Īdding peripherals may increase the loading on the power supply to your board and this, in turn, may affect the voltage presented to the Raspberry Pi. No markup - relates to all production boards.(!) - Information from alpha and beta board days - beta board verified peripherals should still apply to production boards for the most part, but the alpha board is fairly different.(B) - Relates to model B production board.(A) - Relates to model A production board.A suggested suffix markup scheme is as follows: Low-level Peripherals and Expansion Boards.Ī note about this page: For USB devices, please specify if they required a powered hub Notesġ: Now that the Model B board is shipping, details added should relate to this board and the default Debian distribution unless stated otherwise. 22.3 External Battery packs (with 5 V regulated output).20.1 USB to Parallel Port/Printer Adapters.19 USB UART and USB to Serial (RS-232) adapters.That is why I suspect it is defective, so I am just looking for experience of others with it (and whether its wireless range is very limited), to determine whether to exchange it or just return it. I would expect a keyboard to work for normal keys at the BIOS level (like my Logitech di Novo Edge) to be able to get into CMOS setup or boot menus on a normal PC, and that drivers would just be for programming special keys (internet, audio, etc.). When booted in Win7 on a tablet PC (without installing drivers) it did nothing at all (not even mouse movement).

If I boot Ubuntu Linux on a desktop PC, the keyboard does not do anything at all in grub, but mousepad and buttons work in login screen. But I wonder if it is Windows only, only works after configured with its Windows driver, or defective, because without installing special drivers it does nothing in Raspian console. And elinux lists it as working with Raspberry Pi.

I picked up a GearHead KB3800TPW wireless keyboard/mousepad because it is smaller than a normal keyboard, but large enough to touch-type (unlike tiny keyboards) if used to a netbook size keyboard.

Gearhead kb3800tpw drivers