Create code.py

Ripple_Slippers/code.py

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+# SPDX-FileCopyrightText: 2026 Erin St Blaine for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import digitalio
+import neopixel
+
+# =========================================================
+# Ripple Footstep Lights with Color Cycling
+# Pylint-friendly version
+#
+# What this project does:
+# - Reads an FSR on pin A0
+# - Triggers a ripple of light from the center of the strip
+# - Changes color on each new press
+# - If pressed again while running:
+#     - the timer extends
+#     - the color changes immediately
+#     - the ripple restarts from the center
+# =========================================================
+
+
+# -----------------------------
+# USER SETTINGS
+# -----------------------------
+NUM_PIXELS = 20
+ACTIVE_SECONDS = 3.0
+PIXEL_BRIGHTNESS = 0.3
+
+# Lower = faster ripple, higher = slower ripple
+RIPPLE_DELAY = 0.05
+
+# Lower = shorter trail, higher = longer trail
+TRAIL_FADE = 0.6
+
+# End fade settings
+FADE_DELAY = 0.03
+FADE_STEPS = 20
+
+# Color cycle: white -> pink -> purple -> blue
+COLOR_SEQUENCE = [
+    (255, 255, 255),  # white
+    (255, 100, 180),  # pink
+    (180, 0, 255),    # purple
+    (0, 120, 255),    # blue
+]
+
+print("boot")
+
+
+# -----------------------------
+# SENSOR SETUP
+# -----------------------------
+# FSR wired between A0 and GND.
+# With internal pull-up enabled:
+# - unpressed = True
+# - pressed = False
+motion = digitalio.DigitalInOut(board.A0)
+motion.direction = digitalio.Direction.INPUT
+motion.pull = digitalio.Pull.UP
+print("motion ready")
+
+
+# -----------------------------
+# EXTERNAL POWER SETUP
+# -----------------------------
+# The Prop-Maker Feather needs EXTERNAL_POWER enabled
+# to power the external NeoPixel terminal.
+external_power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
+external_power.direction = digitalio.Direction.OUTPUT
+external_power.value = True
+print("external power enabled")
+
+
+# -----------------------------
+# NEOPIXEL SETUP
+# -----------------------------
+pixels = neopixel.NeoPixel(
+    board.EXTERNAL_NEOPIXELS,
+    NUM_PIXELS,
+    brightness=PIXEL_BRIGHTNESS,
+    auto_write=False
+)
+print("pixels ready")
+
+
+# -----------------------------
+# HELPER FUNCTIONS
+# -----------------------------
+def clear():
+    """Turn all pixels off."""
+    pixels.fill((0, 0, 0))
+    pixels.show()
+
+
+def dim_rgb(rgb_value, factor):
+    """Return a dimmed version of an RGB color tuple."""
+    return (
+        int(rgb_value[0] * factor),
+        int(rgb_value[1] * factor),
+        int(rgb_value[2] * factor),
+    )
+
+
+def get_next_color(sequence_index):
+    """
+    Advance to the next color in the sequence.
+
+    Returns:
+        tuple: (new_index, new_rgb)
+    """
+    new_index = (sequence_index + 1) % len(COLOR_SEQUENCE)
+    return new_index, COLOR_SEQUENCE[new_index]
+
+
+def ripple_frame(center_pixel, radius, ripple_rgb):
+    """
+    Draw one frame of the ripple animation.
+
+    center_pixel: where the ripple starts
+    radius: how far the wave has expanded
+    ripple_rgb: current ripple color
+    """
+    for pixel_index in range(NUM_PIXELS):
+        distance = abs(pixel_index - center_pixel)
+
+        # Bright wave front
+        if distance == radius:
+            pixels[pixel_index] = ripple_rgb
+
+        # Optional thicker wave front:
+        # Uncomment these two lines and comment out the line above
+        # if abs(distance - radius) <= 1:
+        #     pixels[pixel_index] = ripple_rgb
+
+        # Fade the trail behind the wave
+        elif distance < radius:
+            red, green, blue = pixels[pixel_index]
+            pixels[pixel_index] = (
+                int(red * TRAIL_FADE),
+                int(green * TRAIL_FADE),
+                int(blue * TRAIL_FADE),
+            )
+
+        # Pixels ahead of the wave stay off
+        else:
+            pixels[pixel_index] = (0, 0, 0)
+
+    pixels.show()
+
+
+def ripple_for(seconds, start_rgb, starting_index):
+    """
+    Run the ripple animation for a set amount of time.
+
+    If the sensor is pressed again while the animation is running:
+    - extend the timer
+    - change to the next color
+    - restart the ripple from the center
+
+    Returns:
+        int: updated color sequence index
+    """
+    center_pixel = NUM_PIXELS // 2
+    active_rgb = start_rgb
+    sequence_index = starting_index
+    end_time = time.monotonic() + seconds
+    was_pressed = False
+    radius = 0
+
+    while time.monotonic() < end_time:
+        is_pressed = not motion.value
+
+        # Detect a new press during the active animation
+        if is_pressed and not was_pressed:
+            sequence_index, active_rgb = get_next_color(sequence_index)
+            print("extended, new color:", active_rgb)
+
+            end_time = time.monotonic() + seconds
+            radius = 0
+
+        ripple_frame(center_pixel, radius, active_rgb)
+
+        radius += 1
+        if radius > NUM_PIXELS:
+            radius = 0
+
+        time.sleep(RIPPLE_DELAY)
+        was_pressed = is_pressed
+
+    return sequence_index
+
+
+def fade_out():
+    """Fade the current pixels smoothly to black."""
+    current_pixels = [pixels[pixel_index] for pixel_index in range(NUM_PIXELS)]
+
+    for step in range(FADE_STEPS, -1, -1):
+        factor = step / FADE_STEPS
+
+        for pixel_index in range(NUM_PIXELS):
+            pixels[pixel_index] = dim_rgb(current_pixels[pixel_index], factor)
+
+        pixels.show()
+        time.sleep(FADE_DELAY)
+
+    clear()
+
+
+# -----------------------------
+# STARTUP FLASH
+# -----------------------------
+startup_colors = [
+    (255, 0, 0),
+    (0, 255, 0),
+    (0, 0, 255),
+]
+
+for startup_rgb in startup_colors:
+    pixels.fill(startup_rgb)
+    pixels.show()
+    time.sleep(0.2)
+
+clear()
+print("starting loop")
+
+
+# -----------------------------
+# MAIN LOOP
+# -----------------------------
+last_state = motion.value
+current_sequence_index = -1
+
+while True:
+    current_state = motion.value
+
+    if current_state != last_state:
+        print("changed:", current_state)
+
+        # Trigger on press: True -> False
+        if not current_state:
+            print("TRIGGERED")
+
+            current_sequence_index, trigger_rgb = get_next_color(
+                current_sequence_index
+            )
+            print("color:", trigger_rgb)
+
+            current_sequence_index = ripple_for(
+                ACTIVE_SECONDS,
+                trigger_rgb,
+                current_sequence_index
+            )
+
+            fade_out()
+
+        last_state = current_state
+
+    time.sleep(0.01)