from machine import Pin, ADC
from time import sleep

# ----- CONFIGURATION -----
led_pins = [2, 3, 4, 5, 6, 7, 8, 9, 10, 11]  # 10 LEDs
leds = [Pin(pin, Pin.OUT) for pin in led_pins]

ldr = ADC(26)  # LDR on GPIO26 / ADC0

# ----- FUNCTION TO MAP LDR VALUE TO LED COUNT -----
def map_ldr_to_leds(value):
    """
    Map ADC value (0-65535) to number of LEDs (0-10)
    Darker -> more LEDs ON
    """
    inverted = 65535 - value
    # Map 0-65535 to 0-10, round properly
    led_count = round((inverted / 65535) * 10)
    # Clamp just in case
    if led_count > 10:
        led_count = 10
    elif led_count < 0:
        led_count = 0
    return led_count

# ----- MAIN LOOP -----
while True:
    ldr_value = ldr.read_u16()
    print("LDR Value:", ldr_value)
    
    num_leds_on = map_ldr_to_leds(ldr_value)
    
    for i in range(10):
        if i < num_leds_on:
            leds[i].on()
        else:
            leds[i].off()
    
    sleep(0.2)