Merge pull request #203 from ladyada/master

carousel! carousel!

Crickits/carousel/code.py

@@ -0,0 +1,126 @@
+import time
+#import math
+import array
+from digitalio import DigitalInOut, Direction, Pull
+import analogio
+import supervisor
+import audioio
+import board
+import neopixel
+
+# NeoPixels
+pixel_pin = board.A1
+num_pixels = 30
+pixels = neopixel.NeoPixel(pixel_pin, num_pixels,
+                           brightness=1, auto_write=False)
+pixels.fill((0, 0, 0))
+pixels.show()
+
+ring = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=1)
+ring.fill((255, 0, 0))
+
+# Light sensor
+light = analogio.AnalogIn(board.LIGHT)
+
+BRIGHT = 40000
+DARK = 10000
+ACTIVITY_THRESHOLD = 20000
+
+# button
+button_a = DigitalInOut(board.BUTTON_A)
+button_a.direction = Direction.INPUT
+button_a.pull = Pull.DOWN
+
+# audio output
+cpx_audio = audioio.AudioOut(board.A0)
+def play_file(wavfile):
+    with open(wavfile, "rb") as f:
+        wav = audioio.WaveFile(f)
+        cpx_audio.play(wav)
+        while cpx_audio.playing:
+            pass
+# Generate one period of wave.
+length = 8000 // 440
+wave_array = array.array("H", [0] * length)
+for i in range(length):
+    # Sine wave
+    # wave_array[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
+    # Triangle wave
+    # wave_array[i] = int( i/length * (2 ** 16))
+    # Saw wave
+    if i < length/2:
+        wave_array[i] = int(i*2/length * (2 ** 16 - 1))
+    else:
+        wave_array[i] = int((2**16 - 1) - i*2/length * (2 ** 16))
+    print((wave_array[i],))
+
+def map_range(x, in_min, in_max, out_min, out_max):
+    # Maps a number from one range to another.
+    mapped = (x-in_min) * (out_max - out_min) / (in_max-in_min) + out_min
+    if out_min <= out_max:
+        return max(min(mapped, out_max), out_min)
+    return min(max(mapped, out_max), out_min)
+
+def wheel(pos):
+    # Input a value 0 to 255 to get a color value.
+    # The colours are a transition r - g - b - back to r.
+    if pos < 85:
+        return (int(pos * 3), int(255 - (pos * 3)), 0)
+    elif pos < 170:
+        pos -= 85
+        return (int(255 - (pos * 3)), 0, int(pos * 3))
+    else:
+        pos -= 170
+        return (0, int(pos * 3), int(255 - pos * 3))
+
+time.sleep(2)
+
+play_file("01_approach.wav")
+
+while not button_a.value:
+    pass  # wait for it to be pressed
+
+if button_a.value:  # A pressed
+    while button_a.value:  # wait for release
+        pass
+
+time.sleep(1)
+
+play_file("02_last_day.wav")
+
+time.sleep(1)
+
+timeout = time.monotonic()
+
+while True:
+    print((light.value,))
+
+    # determine height of pixels
+    pixel_height = map_range(light.value, DARK, BRIGHT, 0, num_pixels)
+    pixels.fill((0, 0, 0))
+    for p in range(pixel_height):
+        pixels[p] = wheel(int(p / num_pixels * 255))
+        pixels.show()
+
+    # determine squeek
+    freq = int(map_range(light.value, DARK, BRIGHT, 440, 8800))
+    sine_wave = audioio.RawSample(wave_array, channel_count=1, sample_rate=freq)
+    cpx_audio.stop()
+    cpx_audio.play(sine_wave, loop=True)
+
+    # check no activity
+    if light.value > ACTIVITY_THRESHOLD:
+        timeout = time.monotonic()  # reset our timeout
+
+    # 4 seconds no activity
+    if time.monotonic() - timeout > 4:
+        break
+
+pixels.fill((255, 0, 0))
+pixels.show()
+play_file("03_no_sanctuary.wav")
+
+time.sleep(1)
+
+# restart
+supervisor.reload()