from machine import ADC, Pin,Timer
LDR = ADC(Pin(15))

GAMMA = 0.7
RL10 50

def fun(tim):
    #print(LDR.read())
    
    const float GAMMA = 0.7;
    const float RL10 = 50;

    // Convert the analog value into lux value:
    int analogValue = analogRead(A0);
    float voltage = analogValue / 4096. * 5;
    float resistance = 2000 * voltage / (1 - voltage / 5);
    float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));


tim = Timer(1)
tim.init(period = 500,mode = Timer.PERIODIC, callback = fun)