Merge pull request adafruit#1267 from kattni/qt-py-neopixels

Basic animations for NeoPixels on QT Py.

Author: jedgarpark

QT_Py_NeoPixels/QT_Py_NeoPixel_Animations.py

@@ -0,0 +1,104 @@
+"""Basic NeoPixel LED animations for the QT Py."""
+import time
+import board
+import neopixel
+import adafruit_pypixelbuf
+
+# Update this to match the pin to which you connected the NeoPixels
+pixel_pin = board.A3
+# Update this to match the number of NeoPixels connected
+num_pixels = 30
+
+pixels = neopixel.NeoPixel(pixel_pin, num_pixels, auto_write=False)
+# Set to 0-1 to change the brightness of the NeoPixels
+pixels.brightness = 0.2
+
+
+def blink(color, wait):
+    """Blink animation. Blinks all pixels."""
+    pixels.fill(color)
+    pixels.show()
+    time.sleep(wait)
+    pixels.fill((0, 0, 0))
+    pixels.show()
+    time.sleep(wait)
+
+
+def chase(color, spacing=3, iteration_step=1):
+    """Theatre chase animation. Chases across all pixels."""
+    if spacing < 2:
+        raise ValueError("Spacing must be greater than 1 to show chase pattern.")
+
+    # Use modulo division to create the spacing between pixels.
+    chase_pixel = iteration_step % spacing
+    # Loop over pixels and turn on expected pixels to provided color.
+    for pixel in range(0, len(pixels), spacing):
+        # If the pixel is outside the total pixel range, break.
+        if pixel + chase_pixel > len(pixels) - 1:
+            break
+        pixels[pixel + chase_pixel] = color
+    pixels.show()
+
+    # Loop over pixels and turn off expected pixels.
+    for pixel in range(0, len(pixels), spacing):
+        # If the pixel is outside the total pixel range, break.
+        if pixel + chase_pixel > len(pixels) - 1:
+            break
+        pixels[pixel + chase_pixel] = (0, 0, 0)
+
+
+def color_wipe(color, wait):
+    """Color wipe animation. Wipes across all pixels."""
+    for pixel in range(num_pixels):
+        pixels[pixel] = color
+        time.sleep(wait)
+        pixels.show()
+    time.sleep(0.5)
+
+
+def rainbow_cycle(wait):
+    """Rainbow cycle animation. Cycles across all pixels."""
+    for color_index in range(255):
+        for pixel in range(num_pixels):
+            pixel_index = (pixel * 256 // num_pixels) + color_index
+            pixels[pixel] = adafruit_pypixelbuf.colorwheel(pixel_index & 255)
+        pixels.show()
+        time.sleep(wait)
+
+
+RED = (255, 0, 0)
+YELLOW = (255, 150, 0)
+GREEN = (0, 255, 0)
+CYAN = (0, 255, 255)
+BLUE = (0, 0, 255)
+PURPLE = (180, 0, 255)
+
+while True:
+    # Blink 5 times. Increase or decrease the range for more or less blinking.
+    for blinks in range(5):
+        blink(RED, 0.5)  # Increase number to slow down blinking, decrease to speed up.
+
+    # Chase. Increase or decrease the range for longer or shorter chase animation.
+    for step in range(50):
+        chase(PURPLE, spacing=4, iteration_step=step)
+        time.sleep(0.05)
+
+    # Fill all pixels.
+    pixels.fill(RED)
+    pixels.show()
+    # Increase or decrease the time to change the speed of the solid color change in seconds.
+    time.sleep(0.5)
+    pixels.fill(GREEN)
+    pixels.show()
+    time.sleep(0.5)
+    pixels.fill(BLUE)
+    pixels.show()
+    time.sleep(0.5)
+
+    # Color wipe.
+    color_wipe(YELLOW, 0.01)  # Increase the number to slow down the color chase.
+    color_wipe(CYAN, 0.01)
+    color_wipe(PURPLE, 0.01)
+
+    # Rainbow cycle.
+    rainbow_cycle(0)  # Increase the number to slow down the rainbow.