It worked fine. Only had to comment out the #define i2Cdev.h to run WriteInstinct.ino, and the same in OpenCat.ino. After that Bittle responded to IR commands via the remote. Thanks for the help, I'm sure my students will love this. dm

I will give the derived version a try very soon. I plan to use Bittle as a teaching aid for my middle school Robotics class. thank you, Rongzhong Li, and happy new year!