Src folder

• moved *.h, *.cpp into src folder

Init() option

• PID() empty no-arguments constructor with Init() to follow
  • convenient when instantiating PID like a static variable and configuring later

Float precision option

• float precision option PID_FLOAT
• cleanup

Namespace cleanup

BREAKING CHANGE:

• moved library-specific constant #define into library class constants
  • library-specific constants declared as global #define polluted global namespace and interfered with other libraries
• if this change breaks your code, rename PID constants in your code as follows:
  • DIRECT to PID::DIRECT
  • REVERSE to PID::REVERSE
  • P_ON_M to PID::P_ON_M
  • P_ON_E to PID::P_ON_E

Example code tweak

• tweaked example code to demonstrate variable time sampling

Initial release

• adapted to work when time between samples is not constant