Secretive legacy vendors are being challenged by VotingWorks, a tiny non-profit that publishes every line of code powering its machines.

Homework Once you get used to thinking about state machines, you’ll see them everywhere. Robots, traffic lights, burglar alarms, and thermostats could use a state machine implementation.

[Tony] has developed a method of using a state machine to validate keypad inputs. His method checks the commands character by character as they are entered in by a 16 button keypad. State machines ...