# Import necessary libraries
import machine
import time

# Define the analog pin connected to the photoresistor
ldr_pin = machine.ADC(26)

# Function to calculate lux based on resistance (a linear relationship for demonstration)
def calculate_lux(resistance):
    # Assuming a simple linear relationship between resistance and lux
    # This relationship should ideally be calibrated using a sensor for accurate lux readings
    return 10000 / resistance  # Just an assumed linear relationship for demonstration


while True:
    # Read the analog value from the photoresistor
    ldr_value = ldr_pin.read_u16()

    # Assuming a 3.3V reference, convert the analog value to voltage
    voltage = ldr_value * 3.3 / 65535

    # Assuming a voltage divider with a 10k resistor, calculate the photoresistor resistance
    voltage_supplied = 3.3  # Voltage supplied
    resistor_value = 10000  # Resistor value in ohms
    photoresistor_resistance = (resistor_value * voltage) / (voltage_supplied - voltage)

    # Calculate lux based on resistance (using a linear relationship for demonstration)
    lux = calculate_lux(photoresistor_resistance)

    print("Lux:", lux, "lux")

    time.sleep(1)  # Wait for 1 second