add rainbows and blinkies

micropython/examples/plasma_stick/alternating-blinkies.py

@@ -0,0 +1,42 @@
+import plasma
+from plasma import plasma2040
+import time
+
+"""
+This super simple example sets up two alternating colours, great for festive lights!
+"""
+
+# 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 = 40
+HUE_2 = 285
+
+# Set up brightness (between 0 and 1)
+BRIGHTNESS = 0.5
+
+# Set up speed (wait time between colour changes, in seconds)
+SPEED = 1
+
+# 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/plasma_stick/rainbows.py

@@ -0,0 +1,36 @@
+import plasma
+from plasma import plasma2040
+import time
+
+"""
+Make some rainbows!
+"""
+
+# Set how many LEDs you have
+NUM_LEDS = 50
+
+# The SPEED that the LEDs cycle at (1 - 255)
+SPEED = 20
+
+# How many times the LEDs will be updated per second
+UPDATES = 60
+
+# WS2812 / NeoPixel™ LEDs
+led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT)
+
+# Start updating the LED strip
+led_strip.start()
+
+offset = 0.0
+
+# Make rainbows
+while True:
+
+    SPEED = min(255, max(1, SPEED))
+    offset += float(SPEED) / 2000.0
+
+    for i in range(NUM_LEDS):
+        hue = float(i) / NUM_LEDS
+        led_strip.set_hsv(i, hue + offset, 1.0, 1.0)
+
+    time.sleep(1.0 / UPDATES)