This is my second project released in hackaday.io website. Chopper HUB is designed to improve productivity of daily work in office. I often have to plug and unplug USB cable between PC and a target device to test it. This operation is manipulated by hands so it makes difficult to build automatic test environment. If each USB port was enabled/disabled by software, test sequence would be automated.

The first prototype has already been built, and then I verified that USB HUB controller IC works without problem, and micro-processor is recognized as USB device after flashing bootloader. Next step is to make firmware to control switches. Specification of API is very important for usability. I'm thinking about it now.