The Yocto-Light-V3 device is an USB ambiant light sensor (lux meter) which will allow you to you measure ambient light up to 100'000 lux. Measurements can be directly read via USB or stored on the device internal flash for later retrieval when connected again by USB.

This device is a replacement for the Yocto-Light V1 which is not produced anymore. THe response to light is closer to human eye than the Yocto-Light-V2.

This circuit has been designed so that the sensor itself can be moved further away from the USB by a few meters: simply split the board into two parts and solder a 4-wire cable on the designated pads.

This device can be connected directly to an Ethernet network using a YoctoHub-Ethernet, to a WiFi network using a YoctoHub-Wireless-g, it can even be connected to a GSM network thanks to the YoctoHub-GSM.

Yocto-Light-V3 Wires to be ordered separately Enclosure available separately

USB cables and enclosure to be ordered separately.

CHF 25.63

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Manufacturer Product NumberLIGHTMK3
Product name:Yocto-Light-V3
USB connectormicro-B
Refresh rate4Hz
Measuring range0...100'000lux
Normal operating temperature5...40░C
Extended operating temperature-30...85░C
Supported Operating SystemsWindows (PC + IoT), Linux (Intel + ARM), macOS, Android
Driversno driver needed
API / SDK / Libraries (USB+TCP)C++, Objective-C, C#, VB.NET, UWP, Delphi, Python, Java, Android
API / SDK / Libraries (TCP only)Javascript, Node.js, PHP
Suggested enclosureYoctoBox-Short-Thin-Black
Cables and enclosuresavailable separately
Made inSwitzerland

Related articles and application examples

 Light sensors comparison  Yocto-Color, Neopixel and ping-pong balls  Yocto-Visualization,  a free visualization app  Yoctopuce-style light barrier  Everything you wanted to know on Yoctopuce sensors 

Accessories and related products

YoctoBox-Short-Thin-Transp, Enclosure for Yoctopuce device (short thin translucent)USB-A-MicroB-30, A to micro-B USB data cable, 30cmYoctoHub-Ethernet, Ethernet-enabled hub for Yoctopuce modules


User manual (HTML)
User manual (PDF)
3D file (STEP)
RoHS Certificate (PDF)
Last Firmware29945 (02/14/2018)
Library for Javascript29837 (02/02/2018)
Library for PHP30378 (03/15/2018)
Library for Objective C29837 (02/02/2018)
Library for C++29837 (02/02/2018)
Library for C#29837 (02/02/2018)
Library for VisualBasic .NET29837 (02/02/2018)
Library for Delphi29837 (02/02/2018)
Library for Python30378 (03/15/2018)
Library for Java30378 (03/15/2018)
Library for Android30378 (03/15/2018)
Library for Command line29837 (02/02/2018)
Virtual Hub for Windows30378 (03/15/2018)
Virtual Hub for Linux, Intel + ARM30378 (03/15/2018)
Virtual Hub for Mac-OS-X30378 (03/15/2018)

Add a comment One comment

1 - norran Sunday,september 10,2017 21H31


I'm suprised new desktop motherboards don't come with light sensors and was therefore very happy to find this product.

You claim that it don't need any drivers. Does that mean that Windows will automatically register this as a light sensors common in laptops and use it to adjust my external screens brightness?

Or is that a no go since my screen is external? (However, this tool seems to indicate that it is possible for software to adjust my monitor: http://clickmonitorddc.bplaced.net/)

Thankful for any help I can get.

Yoctopuce, get your stuff connected.