A simple firmware for keeping PCs awake. In a corporate environment we often have to put up with a managed desktop which is set to lock after a short period of inactivity and we are not able to change that configuration. Well you could build a robot to wiggle your mouse every so often or you could build one of these devices which presents itself to the host as a USB mouse and every minute it moves that mouse 1 pixel left and then right again. You'd have to look very carefully to notice yourself but it's enough to keep the PC thinking you are active!

Hardware

Design files are shown in the hardware folder and were drawn with KiCad version (5.1.9)-1. The printable folder contains the following:

• a schematic PDF
• a pcb design PDF
• a PDF plot in mirrored negative which I used to create the PCB with negative photo-resist film

Firmware

The firmware is built on the fantastic v-usb USB driver which provides USB capabilities to AVR devices that lack USB hardware. I have modified one of their samples.

The firmware is built with Microchip Studio 7.0.2542.

Programming

Set fuses as shown