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Sorry for the delayed reply - my internet went out for a few days. I have some questions to help us diagnose the problem. What application is it for a 3D printer or a filament extruder?. Are you using a voltmeter to read the output or a controller board? I assume you did print out a case and paint the inside with black paint? I assume your filament is not translucent? Is the LED in the light tower illuminating? One thing that may happen is that if you calibrate and not have the metal rod held down on the sensor it will incorrectly calibrate (will overflow) Then you will get spurious readings. This can be fixed by just recalibrating. Also it may be dust, too. Use a cotton swab to gently clean the sensor on the board. Let me know your answers and we should be able to get to a solution.