add fire example

micropython/examples/plasma_stick/fire.py

@@ -0,0 +1,23 @@
+import plasma
+from plasma import plasma2040
+import time
+from random import random, uniform
+
+"""
+A basic fire effect.
+"""
+
+# Set how many LEDs you have
+NUM_LEDS = 50
+
+# WS2812 / NeoPixel™ LEDs
+led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT)
+
+# Start updating the LED strip
+led_strip.start()
+
+while True:
+    # fire effect! Random red/orange hue, full saturation, random brightness
+    for i in range(NUM_LEDS):
+        led_strip.set_hsv(i, uniform(0.0, 50 / 360), 1.0, random())
+    time.sleep(0.1)