Roborio to Arduino over PWM

[nickbrickmaster]

This is very interesting. Not the first thing that I would have thought of for rio-arduino communication. The roboRIO has a second I2C on the MXP, but I can understand not breaking that out. However, I2C can have multiple devices connected as a bus, allowing one to connect multiple slave devices (Arduino, Pixy) to a single master (or even multiple!). Just a note

This is super unique and it's obvious that some good problem solving was had. How did you do it on the roboRIO end?

[Technologyman00]

So on the Roborio side we used AnalogOutput to send a single number over PWM to the Arduino. And because of how the Light Ring works it only has to be sent once to the Arduino because it will display the same color until told otherwise.