Adding rotary QT NeoPixel example.

Author: kattni

examples/seesaw_rotary_neopixel.py

@@ -0,0 +1,47 @@
+"""I2C rotary encoder NeoPixel color picker and brightness setting example."""
+import board
+from adafruit_seesaw import seesaw, neopixel, rotaryio, digitalio
+try:
+    import _pixelbuf
+except ImportError:
+    import adafruit_pypixelbuf as _pixelbuf
+
+# For use with the STEMMA connector on QT Py RP2040
+# import busio
+# i2c = busio.I2C(board.SCL1, board.SDA1)
+# seesaw = seesaw.Seesaw(i2c, 0x36)
+
+seesaw = seesaw.Seesaw(board.I2C(), 0x36)
+
+encoder = rotaryio.IncrementalEncoder(seesaw)
+switch = digitalio.DigitalIO(seesaw, 24)
+
+pixel = neopixel.NeoPixel(seesaw, 6, 1)
+pixel.brightness = 0.5
+
+last_position = -1
+color = 0  # start at red
+
+while True:
+    position = encoder.position
+
+    if position != last_position:
+        print(position)
+
+        if switch.value:
+            # Change the LED color.
+            if position > last_position:  # Advance forward through the colorwheel.
+                color += 1
+            else:
+                color -= 1  # Advance backward through the colorwheel.
+            color = (color + 256) % 256  # wrap around to 0-256
+            pixel.fill(_pixelbuf.colorwheel(color))
+
+        else:  # If the button is pressed...
+            # ...change the brightness.
+            if position > last_position:  # Increase the brightness.
+                pixel.brightness = min(1.0, pixel.brightness + 0.1)
+            else:  # Decrease the brightness.
+                pixel.brightness = max(0, pixel.brightness - 0.1)
+
+    last_position = position