A library for the Arduino & Teensy for using a rotary encoder as an input with embeeded debounce to avoid noise.
Based in the idea and work of David Johnson-Davies - www.technoblogy.com
Complete description of his idea can be found in his web: http://www.technoblogy.com/show?1YHJ
I was searching a library for using a rotary encoder for my latest project and I found a lot of information on this topic but none of the existing libraries eliminate (without false negatives and positives) the effects of contact bounce. So I finally found that David Johnson-Davies idea that I turned into a library. I am using cheap and noisy, chinese mechanical encoders. With this lib, if I manually rotate them as quickly as I can, no steps are lost. The David Johnson-Davies approach ensure the consistency of the rotate direction checking if a clock transition is new (process it) or repeat (noise - ignore).
How to use:
-
Include the library (obviuosly!)
-
Setup an encoder:
DebouncedEncoder myEnc(pin1, pin2, max, min, cycle); // pin1 & pin2: encoder pins; // max: maximun value for the encoder count; // min: minimum value for the encoder count; // cycle: if TRUE, the encoder reset count to the min when reach max. If FALSE, hold the max value. -
Get the encoder position
myEnc.getPosition() // It works better if attached to interrupt pin. -
Optional: you can set the encoder anytime values this way:
myEnc.setPosition(value) //int myEnc.setMaxValue(newMaxValue) //int myEnc.setMinValue(newMinValue) //int setCycleMode(bool newCycleMode) //bool
To do: Sure that this code can be optimized, but it works!