first commit chroma light ring code

Chromakey_Light_Ring/chromakey_light_ring.py

@@ -0,0 +1,86 @@
+# SPDX-FileCopyrightText: 2021 Tod Kurt @todbot and John Park for Adafruit Industries
+# SPDX-License-Identifier: MIT
+# QT Py encoder based on https://github.com/todbot/qtpy-knob
+# Retroreflective chromakey light ring
+#                 Mount a rotary encoder directly to an Adafruit QT Py,
+#                 add some neopixels to get a color/brightness controller
+#
+import time
+import board
+from digitalio import DigitalInOut, Direction, Pull
+import neopixel
+import rotaryio
+
+
+dim_val = 0.2
+
+NUM_PIX = 24
+
+PIX_TYPE = "RGB"  # RGB or RGBW
+
+if PIX_TYPE == "RGB":
+    ORDER = (1, 0, 2)
+    GREEN = (0, 255, 0)
+    BLUE = (0, 0, 255)
+    WHITE = (255, 255, 255)
+    BLACK = (0, 0, 0)
+else:
+    ORDER = (1, 0, 2, 3)
+    GREEN = (0, 255, 0, 0)
+    BLUE = (0, 0, 255, 0)
+    WHITE = (0, 0, 0, 255)
+    BLACK = (0, 0, 0, 0)
+
+
+colors = [GREEN, BLUE, WHITE, BLACK]
+current_color = 0
+
+
+ring = neopixel.NeoPixel(
+    board.MISO, NUM_PIX, brightness=0.2, auto_write=False, pixel_order=ORDER
+)
+ring.fill(colors[current_color])
+ring.show()
+
+# button of rotary encoder
+button = DigitalInOut(board.MOSI)
+button.pull = Pull.UP
+
+# Use pin A2 as a fake ground for the rotary encoder
+fakegnd = DigitalInOut(board.A2)
+fakegnd.direction = Direction.OUTPUT
+fakegnd.value = False
+
+encoder = rotaryio.IncrementalEncoder(board.A3, board.A1)
+
+print("---Chromakey Light Ring---")
+
+last_encoder_val = encoder.position
+ring_pos = 0
+rainbow_pos = 0
+last_time = time.monotonic()
+ring_on = True
+
+while True:
+    encoder_diff = last_encoder_val - encoder.position  # encoder clicks since last read
+    last_encoder_val = encoder.position
+
+    if button.value is False:  # button pressed
+        current_color = (current_color + 1) % len(colors)
+        ring.fill(colors[current_color])
+        ring.show()
+        time.sleep(0.5)  # debounce
+
+    else:
+        if encoder_diff > 0:
+            if dim_val >= 0.01:
+                dim_val = (dim_val - 0.01) % 1.0
+                ring.brightness = dim_val
+                ring.show()
+        elif encoder_diff < 0:
+            if dim_val <= 0.99:
+                dim_val = (dim_val + 0.01) % 1.0
+                ring.brightness = dim_val
+                ring.show()
+
+        time.sleep(0.01)