Merge pull request #2658 from adafruit/led_noodle_tree

Adding code for LED Noodle Tree learn guide

Author: TheKitty

LED_Noodle_Tree/code.py

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2023 Phil Burgess for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import math
+import time
+import board
+import adafruit_aw9523
+
+GAMMA = 2.6         # For perceptually-linear brightness
+PINS = (15, 14, 13, 12, 7, 6, 5, 4) # List of pins, one per nOOd
+
+# Instantiate AW9523 on STEMMA I2C bus. This was tested on QT Py RP2040.
+# Other boards might require board.I2C() instead of board.STEMMA_I2C().
+aw = adafruit_aw9523.AW9523(board.STEMMA_I2C())
+
+for pin in PINS:
+    aw.get_pin(pin).switch_to_output(value=True) # Activate pin, initialize OFF
+    aw.LED_modes |= 1 << pin                     # Enable constant-current on pin
+
+while True:                        # Repeat forever...
+    for i, pin in enumerate(PINS): # For each pin...
+        # Calc sine wave, phase offset for each pin, with gamma correction.
+        # If using red, green, blue nOOds, you'll get a cycle of hues.
+        phase = (time.monotonic() - 2 * i / len(PINS)) * math.pi
+        brightness = int((math.sin(phase) + 1.0) * 0.5 ** GAMMA * 255 + 0.5)
+        aw.set_constant_current(pin, brightness)