Quadrature Decoder

Decoder for quadrature rotary encoders

There exist two kinds (AFAIK) of these:

• mechanical ones
• and optical ones.

There are many variations of these:

• with built-in push button
• with built-in push/pull switch (for Airbus builders)
• concentric rotaries (stacked, the axis has an outer and inner part)
  • these can be combined with switches as well
  • usually two rotaries stacked, but sometimes more

just about any Microchip PIC can be used to decode 2 bit gray quadrature code. You need two inputs for each, and two outputs (up and down). Alternatively, you could use a different software that eg. uses the I2C protocol to tell the master (eg. PHCC motherboard) which rotaries where turned, and in which direction.

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