The total WIO idea has been spread out so far into a nice assortiment of modules.
But hat was all based on the Arduino family.
The newe development of he Raspberry Zero, prooves, that other producers can do the same
This unit uses the Raspbery Pi Zero as base, which makes it very compatiive wiht the Arduino boards.
The unit was in principle developed to be used in G-track locs.
But doing that there is oine thing that should be different.
The Zero takes a few seconds to start up, and a not very solid contact from the rails would cause
the loc to stop for a few seconds.
To avoid that , and also to avoid needing to really seriously clean the rails before we can play outside.
the decision was made to use a cgrgeable battery inside the loc
But a loc needs more than just motordrive.
The WIOPi-0 has several other controls on board.

• Control output for 2 servo's, where doors or pantographs can be put in motion.
• Of course ouput for front and backlights. (led output as standard, but applicable or other items
• I2C to connect various other options, even a display
• 2 analog inputs for measuring anything that wopuld be interesting.
• Serial input to connect an RFID unit like ID12LA. This will abort the need of feed-back contacts and a lot of wiring for that.