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Author: videopixil

code.py

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+# SPDX-FileCopyrightText: Adafruit Industries
+# SPDX-FileCopyrightText: 2026 Pedro Ruiz for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+# Code written by Adafruit Industries
+# Adafruit Circuit Playground Express Bluefruit
+
+import time
+import math
+import array
+import board
+import digitalio
+import neopixel
+import analogio
+import audiobusio
+import touchio
+import busio
+import adafruit_lis3dh
+
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
+
+from adafruit_bluefruit_connect.packet import Packet
+from adafruit_bluefruit_connect.color_packet import ColorPacket
+from adafruit_bluefruit_connect.button_packet import ButtonPacket
+import adafruit_fancyled.adafruit_fancyled as fancy
+
+# setup pixels
+pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=1, auto_write=True)
+
+# name colors so you don't need to refer to numbers
+RED = (255, 0, 0)
+BLACK = (0, 0, 0)
+GREEN = (0, 255, 0)
+PURPLE = (100, 0, 255)
+BLUE = (0, 0, 255)
+
+# Declare a 6-element RGB rainbow palette
+PALETTE_RAINBOW = [fancy.CRGB(1.0, 0.0, 0.0), # Red
+           fancy.CRGB(0.5, 0.5, 0.0), # Yellow
+           fancy.CRGB(0.0, 1.0, 0.0), # Green
+           fancy.CRGB(0.0, 0.5, 0.5), # Cyan
+           fancy.CRGB(0.0, 0.0, 1.0), # Blue
+           fancy.CRGB(0.5, 0.0, 0.5)] # Magenta
+
+NUM_LEDS = 10
+offset = 0  # animation position offset
+active_palette = None  # currently running palette animation
+active_color = None  # currently breathing solid color
+
+def update_palette():
+    """Advance one frame of the active palette animation."""
+    global offset
+    if active_palette is None:
+        return
+    for i in range(NUM_LEDS):
+        color = fancy.palette_lookup(active_palette, offset + i / NUM_LEDS)
+        color = fancy.gamma_adjust(color, brightness=0.25)
+        pixels[i] = color.pack()
+    pixels.show()
+    offset += 0.05
+
+def update_breathing():
+    """Slowly breathe the active solid color between brightness 0.2 and 0.5."""
+    if active_color is None:
+        return
+    # Sine wave oscillates 0-1, scale to 0.2-0.5 range
+    brightness = 0.35 + 0.15 * math.sin(time.monotonic() * 1.5)
+    r = int(active_color[0] * brightness)
+    g = int(active_color[1] * brightness)
+    b = int(active_color[2] * brightness)
+    pixels.fill((r, g, b))
+
+# --- VU Meter (audio reactive) setup ---
+mic = audiobusio.PDMIn(
+    board.MICROPHONE_CLOCK, board.MICROPHONE_DATA,
+    sample_rate=16000, bit_depth=16)
+samples = array.array('H', [0] * 320)
+
+CURVE = 2
+SCALE_EXPONENT = math.pow(10, CURVE * -0.1)
+
+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)
+last_vu_input = 0
+active_vu = False  # VU meter mode flag
+
+# VU meter colors mapped to 10 NeoPixels
+VU_GREEN = (0, 127, 0)
+VU_YELLOW = (127, 127, 0)
+VU_RED = (127, 0, 0)
+VU_OFF = (0, 0, 0)
+vu_colors = [VU_GREEN, VU_GREEN, VU_GREEN, VU_GREEN,
+             VU_YELLOW, VU_YELLOW, VU_YELLOW,
+             VU_RED, VU_RED, VU_RED]
+
+def mean(values):
+    """Average of mic sample values."""
+    return sum(values) / len(values)
+
+def normalized_rms(values):
+    """Return normalized RMS of mic samples."""
+    minbuf = int(mean(values))
+    samples_sum = sum(
+        float(sample - minbuf) * (sample - minbuf)
+        for sample in values
+    )
+    return math.sqrt(samples_sum / len(values))
+
+vu_level = 0.0  # smoothed VU level
+
+def update_vu():
+    """Update NeoPixels based on mic input level with smooth rise and fall."""
+    global last_vu_input, vu_level
+    if not active_vu:
+        return
+    mic.record(samples, len(samples))
+    magnitude = normalized_rms(samples)
+    # Compute scaled logarithmic reading in the range 0 to NUM_LEDS
+    target = log_scale(constrain(magnitude, input_floor, input_ceiling),
+                       input_floor, input_ceiling, 0, NUM_LEDS)
+    # Smooth: rise slowly, fall even slower
+    if target > vu_level:
+        vu_level = vu_level + (target - vu_level) * 0.4  # rise speed
+    else:
+        vu_level = vu_level + (target - vu_level) * 0.15  # fall speed
+    input_val = int(vu_level)
+    if last_vu_input != input_val:
+        pixels.fill(VU_OFF)
+        for i in range(min(input_val, NUM_LEDS)):
+            pixels[i] = vu_colors[i]
+        pixels.show()
+        last_vu_input = input_val
+
+# Sentinel for VU meter mode in animation list
+VU_METER = "VU_METER"
+
+# --- Light Sensor setup ---
+light = analogio.AnalogIn(board.LIGHT)
+active_light = False  # Light sensor mode flag
+light_level = 0.0  # smoothed light level
+
+# Light meter warm colors
+LIGHT_DIM = (52, 5, 1)
+LIGHT_BRIGHT = (9, 5, 4)
+
+last_light_color = (0, 0, 0)  # track last written color
+
+def update_light():
+    """All 10 LEDs blend between dim and bright color based on light level."""
+    global light_level, last_light_color
+    if not active_light:
+        return
+    # 0.0 = dark room (dim color), 1.0 = bright room (bright warm color)
+    raw = light.value
+    target = max(0.0, min(1.0, (raw - 1000) / 1000.0))
+    # Smooth: very gentle transitions
+    if target > light_level:
+        light_level = light_level + (target - light_level) * 0.02
+    else:
+        light_level = light_level + (target - light_level) * 0.015
+    # Clamp to prevent drift
+    light_level = max(0.0, min(1.0, light_level))
+    t = light_level
+    new_color = (int(LIGHT_DIM[0] + (LIGHT_BRIGHT[0] - LIGHT_DIM[0]) * t),
+                 int(LIGHT_DIM[1] + (LIGHT_BRIGHT[1] - LIGHT_DIM[1]) * t),
+                 int(LIGHT_DIM[2] + (LIGHT_BRIGHT[2] - LIGHT_DIM[2]) * t))
+    # Only update pixels if the color actually changed
+    if new_color != last_light_color:
+        last_light_color = new_color
+        pixels.fill(new_color)
+        pixels.show()
+
+# Sentinel for Light meter mode in animation list
+LIGHT_METER = "LIGHT_METER"
+
+# Calibrate: record initial sample to get ambient noise floor
+mic.record(samples, len(samples))
+input_floor = normalized_rms(samples) + 2
+input_ceiling = input_floor + .5
+
+# setup bluetooth
+ble = BLERadio()
+uart_service = UARTService()
+advertisement = ProvideServicesAdvertisement(uart_service)
+
+# setup physical buttons
+button_a = digitalio.DigitalInOut(board.D4)
+button_a.direction = digitalio.Direction.INPUT
+button_a.pull = digitalio.Pull.DOWN
+
+button_b = digitalio.DigitalInOut(board.D5)
+button_b.direction = digitalio.Direction.INPUT
+button_b.pull = digitalio.Pull.DOWN
+
+# Capacitive touch pads for brightness
+touch_bright = touchio.TouchIn(board.A1)  # D6 - increase brightness
+touch_dim = touchio.TouchIn(board.A2)     # D9 - decrease brightness
+prev_touch_bright = False
+prev_touch_dim = False
+
+# Setup accelerometer for tap detection
+accelo_i2c = busio.I2C(board.ACCELEROMETER_SCL, board.ACCELEROMETER_SDA)
+accelo = adafruit_lis3dh.LIS3DH_I2C(accelo_i2c, address=0x19)
+accelo.set_tap(1, 100)  # single tap, threshold 100 (medium tap)
+
+# Lists for cycling
+COLOR_LIST = [PURPLE, GREEN, RED, BLUE, LIGHT_METER]
+PALETTE_LIST = [PALETTE_RAINBOW, VU_METER]
+ALL_MODES = [PURPLE, GREEN, RED, BLUE, LIGHT_METER,
+             PALETTE_RAINBOW, VU_METER]
+color_index = 0
+palette_index = 0
+all_modes_index = ALL_MODES.index(LIGHT_METER) + 1  # next mode after light meter
+BRIGHTNESS_STEP = 0.1
+prev_button_a = False
+prev_button_b = False
+
+def apply_mode(selection):
+    """Apply a mode from any list, clearing all other modes."""
+    global active_palette, active_color, active_vu, active_light
+    global vu_level, last_vu_input, light_level, last_light_color
+    global input_floor, input_ceiling
+    active_palette = None
+    active_color = None
+    active_vu = False
+    active_light = False
+    if selection == VU_METER:
+        vu_level = 0.0
+        last_vu_input = 0
+        pixels.fill(VU_OFF)
+        pixels.show()
+        # Let tap vibration settle before listening
+        time.sleep(0.15)
+        # Flush stale mic data, then recalibrate noise floor
+        for _ in range(3):
+            mic.record(samples, len(samples))
+        mic.record(samples, len(samples))
+        input_floor = normalized_rms(samples) + 2
+        input_ceiling = input_floor + 0.5
+        active_vu = True
+    elif selection == LIGHT_METER:
+        light_level = 0.0
+        last_light_color = (0, 0, 0)
+        active_light = True
+    elif isinstance(selection, list):
+        active_palette = selection
+    else:
+        active_color = selection
+
+while True:
+    # set CPXb up so that it can be discovered by the app
+    ble.start_advertising(advertisement)
+    # Start with light meter mode
+    apply_mode(LIGHT_METER)
+    _ = accelo.tapped  # clear any startup tap
+    time.sleep(0.5)    # brief delay to ignore boot vibration
+    while not ble.connected:
+        # Check physical buttons while waiting
+        if button_a.value and not prev_button_a:
+            apply_mode(COLOR_LIST[color_index])
+            color_index = (color_index + 1) % len(COLOR_LIST)
+        if button_b.value and not prev_button_b:
+            apply_mode(PALETTE_LIST[palette_index])
+            palette_index = (palette_index + 1) % len(PALETTE_LIST)
+        prev_button_a = button_a.value
+        prev_button_b = button_b.value
+        # Check capacitive touch for brightness
+        if touch_bright.value and not prev_touch_bright:
+            pixels.brightness = min(1.0, pixels.brightness + BRIGHTNESS_STEP)
+        if touch_dim.value and not prev_touch_dim:
+            pixels.brightness = max(0.05, pixels.brightness - BRIGHTNESS_STEP)
+        prev_touch_bright = touch_bright.value
+        prev_touch_dim = touch_dim.value
+        # Check accelerometer tap to cycle modes
+        if accelo.tapped:
+            apply_mode(ALL_MODES[all_modes_index])
+            all_modes_index = (all_modes_index + 1) % len(ALL_MODES)
+        update_palette()
+        update_breathing()
+        update_vu()
+        update_light()
+        time.sleep(0.02)
+
+    # Now we're connected
+
+    while ble.connected:
+        # Check physical buttons
+        if button_a.value and not prev_button_a:
+            apply_mode(COLOR_LIST[color_index])
+            color_index = (color_index + 1) % len(COLOR_LIST)
+        if button_b.value and not prev_button_b:
+            apply_mode(PALETTE_LIST[palette_index])
+            palette_index = (palette_index + 1) % len(PALETTE_LIST)
+        prev_button_a = button_a.value
+        prev_button_b = button_b.value
+        # Check capacitive touch for brightness
+        if touch_bright.value and not prev_touch_bright:
+            pixels.brightness = min(1.0, pixels.brightness + BRIGHTNESS_STEP)
+        if touch_dim.value and not prev_touch_dim:
+            pixels.brightness = max(0.05, pixels.brightness - BRIGHTNESS_STEP)
+        prev_touch_bright = touch_bright.value
+        prev_touch_dim = touch_dim.value
+        # Check accelerometer tap to cycle modes
+        if accelo.tapped:
+            apply_mode(ALL_MODES[all_modes_index])
+            all_modes_index = (all_modes_index + 1) % len(ALL_MODES)
+
+        # Keep animating the active mode
+        update_palette()
+        update_breathing()
+        update_vu()
+        update_light()
+
+        if uart_service.in_waiting:
+            try:
+                packet = Packet.from_stream(uart_service)
+            except ValueError:
+                continue # or pass.
+
+            if isinstance(packet, ColorPacket): # check if a color was sent from color picker
+                active_palette = None
+                active_color = None
+                active_vu = False
+                active_light = False
+                pixels.fill(packet.color)
+            if isinstance(packet, ButtonPacket): # check if a button was pressed from control pad
+                if packet.pressed:
+                    if packet.button == ButtonPacket.BUTTON_1: # Rainbow palette
+                        apply_mode(PALETTE_RAINBOW)
+                    if packet.button == ButtonPacket.BUTTON_2: # VU Meter
+                        apply_mode(VU_METER)
+                    if packet.button == ButtonPacket.BUTTON_3: # Light Meter
+                        apply_mode(LIGHT_METER)
+                    if packet.button == ButtonPacket.BUTTON_4: # Light Meter
+                        apply_mode(LIGHT_METER)
+                    if packet.button == ButtonPacket.UP: # Brighten
+                        pixels.brightness = min(1.0, pixels.brightness + BRIGHTNESS_STEP)
+                    if packet.button == ButtonPacket.DOWN: # Dim
+                        pixels.brightness = max(0.05, pixels.brightness - BRIGHTNESS_STEP)
+                    if packet.button == ButtonPacket.LEFT: # Cycle modes backward
+                        all_modes_index = (all_modes_index - 1) % len(ALL_MODES)
+                        apply_mode(ALL_MODES[all_modes_index])
+                    if packet.button == ButtonPacket.RIGHT: # Cycle modes forward
+                        apply_mode(ALL_MODES[all_modes_index])
+                        all_modes_index = (all_modes_index + 1) % len(ALL_MODES)
+
+        time.sleep(0.02)  # small delay for smooth animation