how i put string value from BH1750 -light sensor to if else condition?

Other Hardware Science and Measurement
1

working code :

lightMeter.begin();
uint16_t lux = lightMeter.readLightLevel();
lcd.setCursor(0,1);
lcd.print("Int=" + (String)lux + " lux   ");

what i mean to put there:

 if (digitalRead((String)lux) <= (1200))
    { finished = millis();
    stop millis();
    delay(200);
    displayResult();
    stop count++;
    stop(x);
    
    

    }

    else (digitalRead((String)lux) > (120));
    { continue;
}
2 
if (digitalRead((String)lux) <= (1200))

DigitalRead does not take a String as a parameter. It takes a pin number (int). Is there really a lux pin to read? DigitalRead returns a HIGH (1) or a LOW (0). So always less than 1200. Can you explain what that is supposed to do?

Maybe what you want is:

If(lux <= 1200)

else (digitalRead((String)lux) > (120));

The else structure takes no arguments.

3

"It takes a pin number (int)." byte. There are no pins above 255.