       // TODO argument check
       // argument is float
       slit_position = argument.toFloat();
-      Serial.print("set position: ");
-      Serial.println(slit_position);
-      updateLED();
-    }
-    // set instrument_brightness min value
+      // Serial.print("set position: ");
+      // Serial.println(slit_position);
+      updateLED();
+    }
+    // set instrument_brightness_min value
     // "b:[0.0-1.0];"
     else if(command=="b") {
       // TODO argument check
       // argument is float
       instrument_brightness_min = argument.toFloat();
-      Serial.print("set instrument_brightness min value: ");
-      Serial.println(instrument_brightness_min);
+      // Serial.print("set instrument_brightness min value: ");
+      // Serial.println(instrument_brightness_min);
       updateLED();
     }
     else {

    }
  }
  else {
    if(instrument_brightness_min+0.01 <= instrument_brightness) {
      instrument_brightness -= 0.01;
      updateLED();
    }
  }
}

      if(argument.length()==1) {
        // argument is int
        divide = argument.toInt();
        // Serial.print("set divide number: ");
        // Serial.println(divide);
        updateLED();
      }
      else {
