My NerdKit arrived last week. I haven’t had as much time to play with it as I’d have liked, but it’s still awesome. I’ve built the first two examples, a temperature sensor and a binary adder. I’ve modded the adder to light up a couple of LEDs depending on the sum, which taught me how to set pins as output and drive them high or low. It’s all done with bitshifting and logical operators. The variables that control things like input or output are stored in 16 bit integers (if I recall correctly). Each bit stores a boolean value referring to a single pin or setting. With some nice logical operations, it’s possible to retrieve a single bit, or change a single bit to a 1 or a 0. I might write a guide about this someday.
So, what should I tackle next? Should I upgrade the binary adder into the binary RPN calculator that I talked about before (this would require buying some more switches) or should I try to drive the piezoelectric buzzer at frequencies corresponding to musical notes and make music? How can I choose?!