With the Teensy going its best impression of a USB game controller ... says the code is set up so the computer sees a button press on each state change; in other words, the button assigned ...

His custom PCB mates to the factory parts perfectly, and the USB cable between the button ... one provides a simple, one-button screen lock on a Linux box running a virtual machine at his place ...

If you have basic tools, a USB cable and soldering skills ... With just a few dollars in parts and whatever old speaker or other enclosure you have lying around, you can make a sound effects button ...