update qtpy_knob_scroller.py to work in CirPy 8 and RP2040

qtpy_knob_scroller.py

@@ -3,17 +3,24 @@
 #                          Turning knob scrolls vertically,
 #                          pressing & turning scrolls horizontally
 # https://github.com/todbot/qtpy-knob
-# 2021 @todbot / Tod Kurt
+# 2021-2023 @todbot / Tod Kurt
 #
 
+import os
 import time
 import board
 from digitalio import DigitalInOut, Direction, Pull
-import neopixel
-import rotaryio
-import usb_hid
 from adafruit_hid.mouse import Mouse
 from adafruit_hid.keyboard import Keyboard,Keycode
+import gc
+gc.collect()  # not much space on SAMD21 devices any more
+import neopixel
+import usb_hid
+
+if os.uname().machine.find("rp2040") > 0:  # RP2040
+    from fakerotaryio import IncrementalEncoder
+else:
+    from rotaryio import IncrementalEncoder
 
 # 16 position neopixel ring
 ring = neopixel.NeoPixel(board.MISO, 16, brightness=0.2, auto_write=False)
@@ -24,16 +31,14 @@
 
 # Use pin A2 as a fake ground for the rotary encoder
 fakegnd = DigitalInOut(board.A2)
-fakegnd.direction = Direction.OUTPUT
-fakegnd.value = False
+fakegnd.switch_to_output(value=False)
 
-encoder = rotaryio.IncrementalEncoder( board.A3, board.A1 ) 
+encoder = IncrementalEncoder( board.A3, board.A1 )
 
-#cc = ConsumerControl(usb_hid.devices)
 mouse = Mouse(usb_hid.devices)
 keyboard = Keyboard(usb_hid.devices)
 
-print("hello from qtpy-knob-scroller!")
+print("hello from qtpy-knob-scroller!!!")
 
 # standard colorwheel
 def colorwheel(pos):
@@ -63,13 +68,13 @@ def scroll(diff):
         for i in range(-diff):
             mouse.move(0,0, -1)
             time.sleep(0.01)
-    
-while True: 
+
+while True:
     diff = last_encoder_val - encoder.position  # encoder clicks since last read
     last_encoder_val = encoder.position
     ring_pos = (ring_pos + diff) % len(ring)    # position on LED ring
     hue = colorwheel( encoder.position*4 % 255 )     # fun hue change based on pos
-    
+
     if not button.value:                        # button pressed
         keyboard.press(Keycode.LEFT_SHIFT)
         scroll(diff)
@@ -81,12 +86,12 @@ def scroll(diff):
             rainbow_pos = (rainbow_pos + 1) % 256
     else:
         scroll(diff)
-        
-        ring.fill( [int(i/4) for i in hue] ) # make it 1/4 dimmer 
+
+        ring.fill( [int(i/4) for i in hue] ) # make it 1/4 dimmer
         ring[ring_pos] = (255,255,255)
         ring[(ring_pos-1)%len(ring)] = (67,67,67)
         ring[(ring_pos+1)%len(ring)] = (67,67,67)
         ring.show()
-    
+
     print(encoder.position,diff,button.value,ring_pos)
     time.sleep(0.05)