Merge pull request #94 from MisterZeus/add-kitt-example

add kitt.py to examples

examples/kitt.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+
+from sys import exit # so the blinkt lights can turn off
+import time          # so we can wait between frames
+import blinkt        # so we can talk to our blinkt lights!
+
+BRIGHTNESS = 0.2     # range is 0.0 to 1.0
+MAX_COLOUR = 255     # range is 0 to 255
+DECAY_FACTOR = 1.5   # how quickly should MAX_COLOUR fade? (1.5 works well)
+TIME_SLEEP = 0.04    # seconds (0.04 works well)
+
+PIXELS = blinkt.NUM_PIXELS # usually 8, can use fewer if you like!
+
+blinkt.clear # make all pixels blank / black
+blinkt.set_brightness(BRIGHTNESS)
+
+brightpixel = -1
+direction = 1
+
+print('Hello Michael.\nHow are you today?')
+
+while True:
+	# decay all pixels
+	for x in range(PIXELS):
+		pixel = blinkt.get_pixel(x) # format is [ r, g, b, brightness? ]
+		blinkt.set_pixel(x, pixel[0] / DECAY_FACTOR, 0, 0)
+
+	# brightpixel should move back and forth all the pixels,
+	# in a ping-pong, triangle wave. Not (co)sine.
+	brightpixel += direction
+
+	if brightpixel >= PIXELS - 1:
+		brightpixel = PIXELS - 1
+		direction = - abs(direction)
+	if brightpixel <= 0:
+		brightpixel = 0
+		direction = abs(direction)
+
+	blinkt.set_pixel(brightpixel, MAX_COLOUR, 0, 0)
+
+	blinkt.show() # draw the lights!
+	time.sleep(TIME_SLEEP) # wait a bit before working on next frame