Quadrature Encoder Object

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Description #

These three source code examples interface a quadrature encoder clock, data and button signals to the Propeller 2. The first two versions are useful for seeing the internals of the encoder signals, but the third version is a demo with its own encoder object.

Rotary_Encoder_Demo1_Archive.zip – read a quadrature encoder with Spin2 and PASM
Rotary_Encoder_Demo2_Archive.zip – read a quadrature encoder with Spin2 and a more advanced PASM that keeps track of prior positions
Rotary_Encoder_Demo3_Archive.zip – puts the encoder into its own object

The encoder object and terminal (which may be Parallax Serial Terminal or ANSI-Compliant) are started in this method:

pub setup()
    
      enc.start(ENC_A, ENC_B, ENC_BTN, enc.DETENT, 0, LO, HI)       ' start encoder
    
      term.tstart(BR_TERM)                                          ' start terminal serial

The object used in the third example has a complete encoder configuration for the low and high range and button states. The output from Parallax Serial Terminal looks like this: