from machine import Pin, ADC
from time import sleep
 
ldrValue = ADC(26)
redLED = Pin(16, Pin.OUT)   
greenLED = Pin(15, Pin.OUT)

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 ("==================")
    if ldrVoltage > (0.3*3.3) :
        greenLED.value(1)
        redLED.value(0)
    else:
        greenLED.value(0)
        redLED.value(1)
        sleep(2)