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README.md

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+Wall Art
+========
+
+This is a CircuitPython port of an art piece I have
+hanging in the wall of my office, with
+pixels crammed into a cardboard box.
+
+This port is running on a 1x1 stick of wood,
+with tissue paper around it.
+
+It doesn't do anything.
+It just looks interesting.
+
+Most people, when they see it,
+form different ideas about what it's displaying.
+That's cool.
+

wallart.py

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+# Trinket IO demo
+# Welcome to CircuitPython 3.1.1 :)
+
+import board
+from digitalio import DigitalInOut, Direction, Pull
+import adafruit_dotstar as dotstar
+import adafruit_fancyled.adafruit_fancyled as fancy
+import time
+import neopixel
+import random
+
+# One pixel connected internally!
+dot = dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=0.2)
+
+# Built in red LED
+led = DigitalInOut(board.D13)
+led.direction = Direction.OUTPUT
+
+# NeoPixel strip (of 16 LEDs) connected on D4
+GRIDLEN = 64
+grid = neopixel.NeoPixel(board.D4, GRIDLEN, brightness=0.2, auto_write=False, pixel_order=neopixel.GRB)
+
+
+class GlitchPixel:
+    def __init__(self):
+        self.init()
+        self.nsteps = 64
+        self.step = random.randrange(self.nsteps)
+    
+    def init(self):
+        self.step = 0
+        self.pos = random.randrange(GRIDLEN)
+        self.color = fancy.CHSV(random.random()).pack()
+
+    def frame(self):
+        bmask = (0xff * self.step // 32) & 0xff
+        if self.step > self.nsteps/2:
+            bmask = 0xff - bmask
+        #bmask = 0xff >> abs(4 - self.step)
+        mask = (bmask << 16) | (bmask << 8) | (bmask << 0)
+        color = self.color & mask
+        grid[self.pos] = color
+
+        self.step += 1
+        if self.step > self.nsteps:
+            self.init()
+
+def fade():
+    reps = 300 + random.randrange(GRIDLEN)
+    hue = random.randrange(1000)
+    colors = [fancy.CHSV(hue, 255, v).pack() for v in range(0, 256, 32)]
+    rcolors = colors[:]
+    rcolors.reverse()
+    for count in range(reps):
+        pos = count % GRIDLEN
+        for color in colors:
+            grid[pos] = color
+            pos -= 1
+        for color in rcolors:
+            grid[pos] = color
+            pos -= 1
+        grid.show()
+
+def singleCursor():
+    red = fancy.CHSV(0, 210, 127).pack()
+    pos = 20
+    for i in range(80):
+        grid[pos] = red * (i % 2)
+        grid.show()
+        time.sleep(0.08)
+    
+def sparkle():
+    white = fancy.CHSV(0, 0, 127).pack()
+    pos = [0,0,0]
+    for i in range(50):
+        for j in range(len(pos)):
+            pos[j] = random.randrange(GRIDLEN)
+            grid[pos[j]] = white
+        grid.show()
+        for p in pos:
+            grid[p] = 0
+        grid.show()
+
+def glitchPulse():
+    grid.fill(0)
+    pixels = []
+    for i in range(4):
+        p = GlitchPixel()
+        pixels.append(p)
+
+    for f in range(256):
+        for p in pixels:
+            p.frame()
+        grid.show()
+        time.sleep(0.1)
+
+def loop():
+    fade()
+    singleCursor()
+    sparkle()
+    glitchPulse()
+
+while True:
+    loop()