Merge pull request #227 from helgibbons/main

Couple of festive examples for Plasma 2040

micropython/examples/plasma2040/alternating-blinkies.py

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+# This super simple example sets up two alternating colours, great for festive lights!
+
+import plasma
+from plasma import plasma2040
+import time
+
+# Set how many LEDs you have
+NUM_LEDS = 50
+
+# Pick two hues from the colour wheel (from 0-360°, try https://www.cssscript.com/demo/hsv-hsl-color-wheel-picker-reinvented/ )
+HUE_1 = 0
+HUE_2 = 127
+
+# Set up brightness (between 0 and 1)
+BRIGHTNESS = 0.5
+
+# Set up speed (wait time between colour changes, in seconds)
+SPEED = 1
+
+# Pick *one* LED type by uncommenting the relevant line below:
+
+# APA102 / DotStar™ LEDs
+# led_strip = plasma.APA102(NUM_LEDS, 0, 0, plasma2040.DAT, plasma2040.CLK)
+
+# WS2812 / NeoPixel™ LEDs
+led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT)
+
+# Start updating the LED strip
+led_strip.start()
+
+while True:
+    for i in range(NUM_LEDS):
+        # the if statements below use a modulo operation to identify the even and odd numbered LEDs
+        if (i % 2) == 0:
+            led_strip.set_hsv(i, HUE_1 / 360, 1.0, BRIGHTNESS)
+        else:
+            led_strip.set_hsv(i, HUE_2 / 360, 1.0, BRIGHTNESS)
+    time.sleep(SPEED)
+
+    for i in range(NUM_LEDS):
+        if (i % 2) == 0:
+            led_strip.set_hsv(i, HUE_2 / 360, 1.0, BRIGHTNESS)
+        else:
+            led_strip.set_hsv(i, HUE_1 / 360, 1.0, BRIGHTNESS)
+    time.sleep(SPEED)

micropython/examples/plasma2040/random-blinkies.py

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+# This simple example randomises LED colours and brightness for a subtly sparkly effect.
+
+import plasma
+from plasma import plasma2040
+import time
+# Random functions! randrange is for picking integers from a range, and uniform is for floats.
+from random import randrange, uniform
+
+# Set how many LEDs you have
+NUM_LEDS = 50
+
+# Pick what bits of the colour wheel to use (from 0-360°, try https://www.cssscript.com/demo/hsv-hsl-color-wheel-picker-reinvented/ )
+HUE_START = 180
+HUE_END = 260
+
+# Set up brightness minimum and maximum (between 0.0 and 1.0)
+BRIGHTNESS_MIN = 0.2
+BRIGHTNESS_MAX = 0.7
+
+# Set up speed (wait time between updates, in seconds.)
+SPEED = 0.3
+
+# Pick *one* LED type by uncommenting the relevant line below:
+
+# APA102 / DotStar™ LEDs
+# led_strip = plasma.APA102(NUM_LEDS, 0, 0, plasma2040.DAT, plasma2040.CLK)
+
+# WS2812 / NeoPixel™ LEDs
+led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT)
+
+# Start updating the LED strip
+led_strip.start()
+
+# Light up all the leds random colours and brightnesses from the specified ranges...
+for i in range(NUM_LEDS):
+    led_strip.set_hsv(i, randrange(HUE_START, HUE_END) / 360, 1.0, uniform(BRIGHTNESS_MIN, BRIGHTNESS_MAX))
+
+while True:
+    # ...and then update one random pixel at a time to keep things fresh and sparkly.
+    # Comment out the lines below if you want static lights.
+    led_strip.set_hsv(randrange(0, NUM_LEDS), randrange(HUE_START, HUE_END) / 360, 1.0, uniform(BRIGHTNESS_MIN, BRIGHTNESS_MAX))
+    time.sleep(SPEED)