September 10, 2018

Smart Luxmeter (v1.0) manual

Hello. I'm Android Boy, the chief developer of Smart Tools co,.

Recently, the light sensor is basically an embedded sensor with proximity sensor. 3 years ago, I almost finished developing a lux-meter app. But it was hard to calibrate the app on each Android devices, and I had to postpone its release.
In 2018, I could not postpone any more. I released the app with default calibration.

※ Introduction video

※ Main screen
This app shows the original/calibrated value, maximum, average and minimum.
① Refresh : Refresh the chart
② Chart Y-range : Select the vertical range of the chart (0-100, 250, 500, 1000, 5000) 
③ Play / Pause toggle

※ Menu & Settings
- Unit : Lux (lx), Foot-candle(fc)
- Sound effect : on/off toggle
- Line-chart duration : you can select the time duration of line chart (30 sec - 4 hours)

※ Point to the light source
For accurate measurement, make sure that your screen with the sensor is facing the ambient light source like the sun, sky, window, lamp and candle. An actual light meter has a large convex sensor, so it has a wide range of exposures. Meanwhile, the embedded sensor on smart device has a narrow range.

※ How to calibrate?
Go menu > calibration. Select factor option, and enter your own calibration value (range : 40 - 400%).
For example, measured value (200 lx), expected or actual value (300 lx) : enter 150%. (300 / 200 = 150%)

Q. Is this app correct?
A. The app shows the values sent by the sensor. Most embedded sensors are not perfect. Depending on your environment or usage, the results are very different.

 What's new
 - v1.0.6 : Support for OS 11
 - v1.0.2 : Auto aspect button
 - v1.0.1 : Support for Android OS 10
 - v1.0.0 : released (Sep, 2018)

If you have any idea to improve the app, feel free to contact me at Thank you.