The Yocto-Light-V3 device is a USB ambient light sensor (lux meter) which allows you to measure ambient light up to 100'000 lux. Measurements can be read directly 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 that of the human eye than the Yocto-Light-V2.

This circuit has been designed so that the sensor itself can be moved away from the USB part 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-n and to a GSM network using a YoctoHub-GSM.

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

USB cables and enclosures to be ordered separately.

CHF 25.73

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Product name:Yocto-Light-V3
USB connector:micro-B
Refresh rate:4Hz
Measuring range:0...100'000lux
Protection class, according to IEC 61140:class III
Normal operating temperature:5...40░C
Extended operating temperature1:-30...85░C
Supported Operating Systems:Windows (PC + IoT), Linux (Intel + ARM), macOS, Android
Drivers:Driverless, no driver needed
API / SDK / Libraries:C++ Obj-C C# VB.NET UWP Delphi Python Java Android LabVIEW
API / SDK / Libraries (TCP only):Javascript Node.js PHP
RoHS compliance:RoHS III (2011/65/UE+2015/863)
Suggested enclosure:YoctoBox-Short-Thin-Black
Harmonized tariff code:9032.9000
Cables and enclosures:available separately
Made in:Switzerland

1 The extended temperature range is defined based on components specifications and has been tested during a limited duration (1h). When using the device in harsh environments for a long period of time, we strongly advise to run extensive tests before going to production.

Accessories and related products

YoctoBox-Short-Thin-Black, Enclosure for Yoctopuce device (short, thin, black)USB-A-MicroB-50, USB 2.0 type A to Micro-B data cable, 50 cmYoctoHub-Ethernet, Ethernet-enabled hub for Yoctopuce modules

Related articles and application examples


User manual (HTML)
User manual (PDF)
Product brief
3D file (STEP)
RoHS certificate
REACH certificate
Most recent firmware51180 (12/02/2022)
Programming libraries61813 (07/05/2024)
Command line API61813 (07/05/2024)
VirtualHub application61813 (07/05/2024)

Add a comment 7 comments

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.

2 - varkenvarken Monday,february 11,2019 16H43


When separating the sensor unit from the main module, what does 'a few meters' mean? ;-) would 4 meters be possible? Would it be possible to extend that range by using a shielded or twisted pair cable or is resistance the limiting factor here?


-- michel.

3 - martinm (Yocto-Team)Monday,february 11,2019 16H47

@varkenvarken: Up to 10 meters should be fine. Indeed the wire quality will affect the distance.

4 - youry Wednesday,october 09,2019 19H57


To witch class of the norm DIN 5032-7 this sensor corresponds to?


5 - mvuilleu (Yocto-Team)Thursday,october 10,2019 9H16

@youry: this sensor is not sold as certified for accuracy according to DIN standard. We rely on ROHM sensor factory calibration. See the blog description for the response curve to wavelengths, or the datasheet of the BH1751FVI sensor for more detailed information about factory calibration accuracy.

6 - rokejulianlockhart Monday,january 09,2023 17H02

Yoctopuce-team, I would be very glad if you'd respond to norran's question, because their concern is the difference between me purchasing this and not. I only want it as an OS-level light level sensor for Windows 11. Thanks.


7 - martinm (Yocto-Team)Monday,january 09,2023 17H11

@rokejulianlockhart: I don't know how we missed that question, but the answer is no, the operating system will not recognize the sensor as a native light sensor. Yoctopuce sensors only work with applications that have been designed for them, using our programming libraries.

That being said adjusting a Windows desktop luminosity with a Yoctopuce light sensor can be done, have a look at this article:

Yoctopuce, get your stuff connected.