Wednesday, February 24, 2010
note: this video is showing an early prototype, behavior of the final version is slightly modified
A good while back, I made the 1-key-keyboard project. Ever since it has always been in the back of my mind that the ATTiny microcontroller, which I used in this project, had still 3 IO ports which were unused. Only recently I’ve found the time to expand my old project in the most obvious way possible; by adding 3 more buttons to these IO ports and thereby creating a 4-key-keyboard, without having to add any other hardware than these 3 extra buttons.
Although this project can still easily be built on a stripboard, I chose this time to etch my own (single sided) PCB and to use an old USB cable to interface with the computer, instead of the makeshift USB-plug as used in my previous project.