I recently added the USB_B_Micro symbol (and an alias, USB_B_Mini). I
hadn't noticed that there was already a similar USB_OTG symbol.
However, the two need to remain separate, because USB_OTG has VBUS and
GND marked as power inputs, while USB_B_Micro has them as power
outputs.
This commit makes USB_B_Micro identical to USB_OTG, except for the
direction of the power pins. Specifically, it copies the connector
shape from USB_OTG to USB_B_Micro. (I had been too lazy to draw the
connector shape when I created USB_B_Micro.)
Strangely, there are already some footprints for USB micro connectors
in the Connectors_USB library:
https://github.com/KiCad/Connectors_USB.pretty
but I couldn't find any schematic symbols for a micro USB connector.
(USB micro B and mini B connectors have an additional pin, the ID pin,
which is not present in the traditional USB B connector, so the
existing USB_B symbol can't be used.)
So, I have added a symbol USB_B_Micro, based on the existing USB_B
symbol. I've also added USB_B_Mini as an alias for USB_B_Micro,
because the micro and mini connectors have the same pinout.
The pinout is here:
http://pinouts.ru/PortableDevices/micro_usb_pinout.shtml
