EncoderTool is a software library to manage and read out rotary encoders with Teensy ARM boards. It has an MIT license.

Key features

• Supports directly connected and multiplexed encoders
• Supports all common types of encoders, i.e., full (no detents, 4 counts per period), half (two detents and two counts per period) and quarter (1 detent and one count per period) and some variants of those.
• A callback mechanism allows for easy event based menu systems. Callbacks use std::function and can call non static member functions.
• Fully bounce free without additional hardware
• Provides hard and cyclic count limits
• Supports and debounces encoder push buttons. Callback for notification of button events available
• Currently 74165, 4067 and 4051 based multiplexers are supported but the class structure allows for easy extension to any other multiplexer.
• Schematics and Eagle files for multiplexed encoders available in the Extras folder

See the GitHub repo and the documentation.