 
 #define BrightMax 255
 #define BrightMin 0
-int brightness_increment = -2;
 
 // read the buttons
 int read_LCD_buttons()

      if( brightness <= BrightMin ){
        brightness = BrightMin;
      }
      break;
    }
    case btnUP: {

  }
  analogWrite(PinBacklight, brightness);

  // assemble first LCD line
  line1 = "";
  line1 = "ADC:" + String(adc_key_in);
  while( line1.length() < 16 - key.length() ){
