Presentation code

cpx_accel_neopixels.py

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+from adafruit_circuitplayground.express import cpx
+import time
+
+# Main loop gets x, y and z axis acceleration, prints the values, and turns on
+# red, green and blue, at levels related to the x, y and z values.
+while True:
+    if cpx.switch:
+        print("Slide switch off!")
+        cpx.pixels.fill((0, 0, 0))
+        continue
+    else:
+        R = 0
+        G = 0
+        B = 0
+        x, y, z = cpx.acceleration
+        print(x, y, z)
+        if x:
+            R = R + abs(int(x))
+        if y:
+            G = G + abs(int(y))
+        if z:
+            B = B + abs(int(z))
+        cpx.pixels.fill((R, G, B))
+        time.sleep(0.2)

cpx_accelerometer.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+while True:
+    x, y, z = cpx.acceleration
+    print(x, y, z)
+    time.sleep(0.5)

cpx_blinky.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+while True:
+    cpx.red_led = True
+    time.sleep(0.5)
+    cpx.red_led = False
+    time.sleep(0.5)

cpx_button_a.py

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+from adafruit_circuitplayground.express import cpx
+
+while True:
+    if cpx.button_a:
+        cpx.red_led = True

cpx_button_b.py

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+from adafruit_circuitplayground.express import cpx
+
+while True:
+    if cpx.button_b:
+        cpx.red_led = True
+    else:
+        cpx.red_led = False

cpx_light_sensor.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+while True:
+    print("Lux:", cpx.light)
+    time.sleep(1)

cpx_neopixel_1.py

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+from adafruit_circuitplayground.express import cpx
+
+cpx.pixels.brightness = 0.3
+
+while True:
+    cpx.pixels[1] = (0, 255, 0)

cpx_neopixels_fill.py

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+from adafruit_circuitplayground.express import cpx
+
+while True:
+    cpx.pixels.fill((50, 0, 0))

cpx_play_tone.py

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+from adafruit_circuitplayground.express import cpx
+
+while True:
+    cpx.play_tone(262, 1)

cpx_shake.py

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+from adafruit_circuitplayground.express import cpx
+
+while True:
+    if cpx.shake():
+        print("Shake detected!")

cpx_sound_meter.py

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+import array
+import audiobusio
+import board
+import math
+import neopixel
+
+CURVE = 2
+SCALE_EXPONENT = math.pow(10, CURVE * -0.1)
+
+PEAK_COLOR = (80, 0, 255)
+NUM_PIXELS = 10
+NUM_SAMPLES = 160
+
+
+def constrain(value, floor, ceiling):
+    return max(floor, min(value, ceiling))
+
+
+def log_scale(input_value, input_min, input_max, output_min, output_max):
+    normalized_input_value = (input_value - input_min) / (input_max - input_min)
+    return output_min + math.pow(normalized_input_value, SCALE_EXPONENT) * (output_max - output_min)
+
+
+def normalized_rms(values):
+    minbuf = int(mean(values))
+    return math.sqrt(sum(float(sample - minbuf) * (sample - minbuf) for sample in values) / len(values))
+
+
+def mean(values):
+    return sum(values) / len(values)
+
+
+def volume_color(i):
+    return i * (255 // NUM_PIXELS), 50, 0
+
+
+pixels = neopixel.NeoPixel(board.NEOPIXEL, NUM_PIXELS, brightness=0.1, auto_write=False)
+pixels.fill(0)
+pixels.show()
+
+mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA, frequency=16000, bit_depth=16)
+samples = array.array('H', [0] * NUM_SAMPLES)
+mic.record(samples, len(samples))
+input_floor = normalized_rms(samples) + 10
+
+# Lower number means more sensitive - more LEDs will light up with less sound.
+sensitivity = 500
+input_ceiling = input_floor + sensitivity
+
+peak = 0
+while True:
+    mic.record(samples, len(samples))
+    magnitude = normalized_rms(samples)
+    print(magnitude)
+
+    c = log_scale(constrain(magnitude, input_floor, input_ceiling),
+                  input_floor, input_ceiling, 0, NUM_PIXELS)
+
+    pixels.fill(0)
+    for i in range(NUM_PIXELS):
+        if i < c:
+            pixels[i] = volume_color(i)
+        if c >= peak:
+            peak = min(c, NUM_PIXELS - 1)
+        elif peak > 0:
+            peak = peak - 1
+        if peak > 0:
+            pixels[int(peak)] = PEAK_COLOR
+    pixels.show()

cpx_start_stop_tone.py

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+from adafruit_circuitplayground.express import cpx
+
+while True:
+    if cpx.button_a:
+        cpx.start_tone(262)
+    elif cpx.button_b:
+        cpx.start_tone(294)
+    else:
+        cpx.stop_tone()

cpx_temperture_sensor.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+while True:
+    print("Temperature C:", cpx.temperature)
+    time.sleep(1)

cpx_touch_a1.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+while True:
+    if cpx.touch_A1:
+        print("Touched A1!")
+    time.sleep(0.1)

cpx_touch_all.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+while True:
+    if cpx.touch_A1:
+        print("Touched A1!")
+    if cpx.touch_A2:
+        print("Touched A2!")
+    if cpx.touch_A3:
+        print("Touched A3!")
+    if cpx.touch_A4:
+        print("Touched A4!")
+    if cpx.touch_A5:
+        print("Touched A5!")
+    if cpx.touch_A6:
+        print("Touched A6!")
+    if cpx.touch_A7:
+        print("Touched A7!")
+    time.sleep(0.1)

cpx_touch_fill_rainbow.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+cpx.pixels.brightness = 0.3
+
+while True:
+    if cpx.touch_A1:
+        print("Touched A1!")
+        cpx.pixels.fill((255, 0, 0))
+    if cpx.touch_A2:
+        print("Touched A2!")
+        cpx.pixels.fill((210, 45, 0))
+    if cpx.touch_A3:
+        print("Touched A3!")
+        cpx.pixels.fill((155, 100, 0))
+    if cpx.touch_A4:
+        print("Touched A4!")
+        cpx.pixels.fill((0, 255, 0))
+    if cpx.touch_A5:
+        print("Touched A5!")
+        cpx.pixels.fill((0, 135, 125))
+    if cpx.touch_A6:
+        print("Touched A6!")
+        cpx.pixels.fill((0, 0, 255))
+    if cpx.touch_A7:
+        print("Touched A7!")
+        cpx.pixels.fill((100, 0, 155))
+    time.sleep(0.1)

cpx_touch_pixel_rainbow.py

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+import time
+from adafruit_circuitplayground.express import cpx
+
+cpx.pixels.brightness = 0.3
+
+while True:
+    if cpx.touch_A1:
+        print("Touched A1!")
+        cpx.pixels[6] = (255, 0, 0)
+    if cpx.touch_A2:
+        print("Touched A2!")
+        cpx.pixels[8] = (210, 45, 0)
+    if cpx.touch_A3:
+        print("Touched A3!")
+        cpx.pixels[9] = (155, 100, 0)
+    if cpx.touch_A4:
+        print("Touched A4!")
+        cpx.pixels[0] = (0, 255, 0)
+    if cpx.touch_A5:
+        print("Touched A5!")
+        cpx.pixels[1] = (0, 135, 125)
+    if cpx.touch_A6:
+        print("Touched A6!")
+        cpx.pixels[3] = (0, 0, 255)
+    if cpx.touch_A7:
+        print("Touched A7!")
+        cpx.pixels[4] = (100, 0, 155)
+    time.sleep(0.1)