pic: 4143 RoboRio expansion card prototypes ordered

[RyanShoff]

We have a been using a lot of analog position sensors, so I know we'll need the the extra 4 analog inputs. They are broke out to headers.

The Arduino is wired to the I2C bus. It is there to handle Adafruit Neopixel LED strings. There will be push connectors to hook the LED strings up to.

All pins also have a solder hole to put whatever else you need.

I think I flipped the top and bottom pin rows on the RoboRio so the first boards will just be for fit up. I guess I spent too much time on the artwork and not enough on the engineering...

The files will be posted to github once I'm confident there aren't big mistakes like shorting power to ground.

Will any RoboRios be at IRI to see if the physical layout is ok?