Setting up the PixyCam2
The PixyCam2 (or just Pixy) is a camera with built-in object recognition.
Installing Pixymon
The software that configures this object recognition (Pixymon) needs to be downloaded to a computer. The download page is here -- if that doesn't work, just do a web search for Pixymon and it'll probably be the first page.
Further instructions can be found in the "installation docs" underneath the download links on the page above.
Installing libraries
Follow the instructions here: https://github.com/PseudoResonance/Pixy2JavaAPI#readme
Configuring hardware
If you're using the Pixy with a Raspberry Pi, follow these instructions.
API docs
https://ci.otake.pw/job/Pixy2JavaAPI/javadoc/index.html?overview-tree.html
The concepts are better explained here: https://docs.pixycam.com/wiki/doku.php?id=wiki:v2:full_api