Stepperature is a DIY, Open Hardware, Manual Pulse Generator (Quadrature) hand wheel interface for CNC, audio, or other projects.
Check out our Kickstarter project! http://www.kickstarter.com/projects/1375236253/stepperature-open-source-quadrature-hand-wheel
License Info: Hardware: CC BY-SA 3.0 Firmware: Apache 2.0