In my work trying to create devices that can install OSes from scratch on computers and flash phones and embedded IoT devices, I’m always looking for things that can support being both a usb host and a usb gadget.

Think about your phone, how it works to connect a micro-B to charge and connect to it as a gadget to your computer, then when you connect a micro-A cable you plug mice, keyboard, and thumb drives into your phone.

As a usb host, you can plug a mouse, keyboard, and pretty much anything you’d plug into your computer to it. Allowing you to do things like:

As a usb gadget, you can plug the device into a computer and have it show up as a usb keyboard, disk, network, and other interesting things.

I’m looking to see if we can’t get the new $5 RPi zero to function as both.