They say on hackaday.com they’re running out of fails for their weekly fail series. So I decided to help them out a little bit 😉
Anyway, a few weeks ago I needed a few usb-to-gpio modules to drive switch some basic stuff on and off from an MK802 dongle. Usually I take an attiny2313 and etch a board for this purpose, but this time I was short on free time to do it myself.
The schematics are well-tested a long time ago. vusb powered firmware based on antares and lunartool applet for the host side are also ready and fully debugged. What could possibly go wrong in such a damn simple project?
However this time boards (already tested multiple times when etched at home) were a failure. Mostly because I was in a terrible hurry to reroute them, replace 2.54 pins with screw terminals, add mounting holes and send them to the fab…