An USB interface for Psion series 5 PDA keyboards. Plug in a keyboard and a USB cable, and use it with any modern computer. Additional keyboards can be supported through firmware changes.
I'm making a upgraded Psion 5mx PDA, and I wanted an easy way to interface the original keyboard to a more modern computer. By identifying itself as a regular USB keyboard, it should work on any modern operating system without using any drivers.
The adapter uses a ATMEGA32u4 CPU, the same as the Arduino Lenoardo. The board comes pre-loaded with the Leonardo bootloader, and also ISP connection pads if you want to use it as a "regular" AVR development board. The keyboard firmware is also written in the Arduino environment, making it easy to modify.
The hardware and firmware are 100% open source. See my GitHub for details.
On the rear side of each PCB is a small scratch where I had to fix a silly layout mistake. This does not affect the functionality in any way, it is purely cosmetic. All boards are fully tested before shipping.
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I'm a hardware maker based near Stockholm in Sweden