Added RPi-specific example

examples/rpi_neopixel_simpletest.py

@@ -0,0 +1,75 @@
+# Simple test for NeoPixels on Raspberry Pi
+import time
+import board
+import neopixel
+
+
+# Choose an open pin connected to the Data In of the NeoPixel strip, i.e. board.D18
+# NeoPixels must be connected to D10, D12, D18 or D21 to work.
+pixel_pin = board.D18
+
+# The number of NeoPixels
+num_pixels = 30
+
+# The order of the pixel colors - RGB or GRB. Some NeoPixels have red and green reversed!
+# For RGBW NeoPixels, simply change the ORDER to RGBW or GRBW.
+ORDER = neopixel.GRB
+
+pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.2, auto_write=False,
+                           pixel_order=ORDER)
+
+
+def wheel(pos):
+    # Input a value 0 to 255 to get a color value.
+    # The colours are a transition r - g - b - back to r.
+    if pos < 0 or pos > 255:
+        r = g = b = 0
+    elif pos < 85:
+        r = int(pos * 3)
+        g = int(255 - pos*3)
+        b = 0
+    elif pos < 170:
+        pos -= 85
+        r = int(255 - pos*3)
+        g = 0
+        b = int(pos*3)
+    else:
+        pos -= 170
+        r = 0
+        g = int(pos*3)
+        b = int(255 - pos*3)
+    return (r, g, b) if ORDER == neopixel.RGB or ORDER == neopixel.GRB else (r, g, b, 0)
+
+
+def rainbow_cycle(wait):
+    for j in range(255):
+        for i in range(num_pixels):
+            pixel_index = (i * 256 // num_pixels) + j
+            pixels[i] = wheel(pixel_index & 255)
+        pixels.show()
+        time.sleep(wait)
+
+
+while True:
+    # Comment this line out if you have RGBW/GRBW NeoPixels
+    pixels.fill((255, 0, 0))
+    # Uncomment this line if you have RGBW/GRBW NeoPixels
+    # pixels.fill((255, 0, 0, 0))
+    pixels.show()
+    time.sleep(1)
+
+    # Comment this line out if you have RGBW/GRBW NeoPixels
+    pixels.fill((0, 255, 0))
+    # Uncomment this line if you have RGBW/GRBW NeoPixels
+    # pixels.fill((0, 255, 0, 0))
+    pixels.show()
+    time.sleep(1)
+
+    # Comment this line out if you have RGBW/GRBW NeoPixels
+    pixels.fill((0, 0, 255))
+    # Uncomment this line if you have RGBW/GRBW NeoPixels
+    # pixels.fill((0, 0, 255, 0))
+    pixels.show()
+    time.sleep(1)
+
+    rainbow_cycle(0.001)    # rainbow cycle with 1ms delay per step