Relative Rotary Encoder SENSOR

Specification

What		Comments
Identifier	REL_ROT_ENCODER
Interface	3 GPIO	GPIO 1: A signal GPIO 2: B signal GPIO 3: SW signal (switch)
Provides	dir	-1: counter clockwise 0: no movement 1: clockwise
	val	encoder value
	sw	0: switch released 1: switch pressed
Properties	none
Callbacks?	yes

Notes:

• This sensor requires debouncing by hardware

Code

-- Attach encoder. Signal assignments are:
-- A: GPIO26
-- B: GPIO14
-- SW: GPIO21
s = sensor.attach("REL_ROT_ENCODER", pio.GPIO26, pio.GPIO14, pio.GPIO21)

-- Register a callback. Callback is executed when some sensor property changes.
s:callback(
   function(data)
      if (data.dir == -1) then
         print("ccw, value "..data.val)
      elseif (data.dir == 1) then
         print("cw, value "..data.val)
      end
      
      if (data.sw == 1) then
         print("sw on")
      elseif (data.sw == 0) then
         print("sw off")
      end
   end
)