from machine import Pin, ADC
from time import sleep
 
ldrValue = ADC(27)


MAX_ADC_READING = 65535;
ADC_REF_VOLTAGE = 3.3;
REF_RESISTANCE = 50;
LUX_CALC_SCALAR = 12518931;
LUX_CALC_EXPONENT = -1.405;
while True:
    rawData = ldrValue.read_u16()
    print(f"Raw data: {rawData}")
    resistorVoltage = rawData / MAX_ADC_READING * ADC_REF_VOLTAGE;
    print(f"Resistor voltage: {resistorVoltage}")
    ldrVoltage = ADC_REF_VOLTAGE - resistorVoltage;
    print(f"LDR voltage: {ldrVoltage}")
    ldrResistance = ldrVoltage/resistorVoltage * REF_RESISTANCE;
    print(f"LDR resistance: {ldrResistance}")
    ldrLux = LUX_CALC_SCALAR * pow(ldrResistance, LUX_CALC_EXPONENT);
    print(f"Lux: {ldrLux}")
    print("==========")
    sleep(2)