led-rack-panel/code.py

import board
import rotaryio
import neopixel
import time
import digitalio
import microcontroller

num_pixels = 10

pixels = neopixel.NeoPixel(board.GP5, num_pixels)
encoder = rotaryio.IncrementalEncoder(board.GP19, board.GP18)
button = digitalio.DigitalInOut(board.GP17)
button.direction = digitalio.Direction.INPUT
button.pull = digitalio.Pull.UP

# Predefined colors
colors = [
    (255, 0, 0),  # Red
    (0, 255, 0),  # Green
    (0, 0, 255),  # Blue
    (255, 255, 255),  # White
    (200, 255, 200),  # Cold white
    (255, 20, 100),  # Warm white
]

# Brightness levels (6 steps, including 0 for off)
brightness_levels = [0.0, 0.2, 0.4, 0.6, 0.8, 1.0]

# Check and initialize non-volatile memory
if len(microcontroller.nvm) < 5:
    microcontroller.nvm = bytearray(5)  # Initialize with 5 bytes
    microcontroller.nvm[0:4] = b"0.80"  # Default brightness
    microcontroller.nvm[4:5] = (0).to_bytes(1, "little")  # Default color index

# Load settings from non-volatile memory
try:
    brightness_index = int(float(microcontroller.nvm[0:4].decode()) * 5)
    color_index = int.from_bytes(microcontroller.nvm[4:5], "little")
    if color_index >= len(colors):
        color_index = 0  # Reset to default if out of range
except ValueError:
    brightness_index = 4  # Default brightness (0.8)
    color_index = 0  # Default color index (red)

pixels.brightness = brightness_levels[brightness_index]
current_color = colors[color_index]
pixels.fill(current_color)

button_state = None
last_encoder_pos = encoder.position

def fade_colors(start_color, end_color, steps=50, delay=0.02):
    """Smoothly fade between two colors."""
    for step in range(steps):
        ratio = step / steps
        interpolated_color = tuple(
            int(start_color[i] * (1 - ratio) + end_color[i] * ratio) for i in range(3)
        )
        pixels.fill(interpolated_color)
        time.sleep(delay)

while True:
    # Read encoder position for brightness control
    enc_pos = encoder.position
    if enc_pos != last_encoder_pos:
        step_change = enc_pos - last_encoder_pos
        last_encoder_pos = enc_pos
        brightness_index = min(max(brightness_index + step_change, 0), len(brightness_levels) - 1)
        pixels.brightness = brightness_levels[brightness_index]
        print(f"Brightness: {brightness_levels[brightness_index]:.2f}")

    # Handle button press to cycle colors
    if not button.value and button_state is None:
        button_state = "pressed"
    elif button.value and button_state == "pressed":
        new_color_index = (color_index + 1) % len(colors)
        fade_colors(colors[color_index], colors[new_color_index])
        color_index = new_color_index
        current_color = colors[color_index]  # Update current_color
        pixels.fill(current_color)  # Apply the new color
        print(f"Selected color: {current_color}")
        button_state = None

    # Set the pixels to the current color (if not transitioning)
    if brightness_levels[brightness_index] > 0.0:  # Only fill if brightness > 0
        pixels.fill(current_color)

    # Save settings to non-volatile memory
    brightness_value = brightness_levels[brightness_index]
    microcontroller.nvm[0:4] = f"{brightness_value:.2f}".encode()  # Save brightness as a string (e.g., "0.80")
    microcontroller.nvm[4:5] = color_index.to_bytes(1, "little")  # Save color index as a single byte