dimmer.py

from neopixel import NeoPixel
import time

# --- Configuration ---
ADC_PIN = 26        # Potentiometer connected to GPIO 26 (ADC0)
BUTTON_PIN = 8     # Button connected to GPIO 14
PIXEL_PIN = 25      # Internal Neopixel pin for most RP2040 Matrix boards

np = NeoPixel(Pin(16), 25, bpp = 3) # bpp = bytes per pixel (GRB)
pot = machine.ADC(ADC_PIN)
button = machine.Pin(BUTTON_PIN, machine.Pin.IN, machine.Pin.PULL_UP)

def get_brightness():
    # Read ADC (0-65535) and scale it to (0-255) for NeoPixel intensity
    # Using a bit-shift or integer division
    brightness = pot.read_u16() >> 8
    return brightness // 10
    # Integer division by 10 to clamp brightness
    
while True:
    brightness = get_brightness()
    
    # Set a color (White in this case) scaled by the potentiometer
    # color = (R, G, B)
    color = (brightness, brightness, brightness)
    
    np.fill(color)
    np.write()