This device is a digital USB voltmeter that allows you to measure voltage automatically. It can provide quite precises digital measures for low DC voltage (0.01 Volt precision), but works as well for higher voltage, including AC, up to 250V (RMS), with a precision of 3%.

This device is isolated, which means that the sensing part is electrically disconnected from the USB part: you can measure any voltage difference between -250V and 250V, without risk of frying your computer.
The modules provides immediate reading on USB, and can also store measures on the device internal flash for later retrieval when connected again by USB.

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-Volt Yocto-Volt Yocto-Volt

USB cables and enclosure to be ordered separately.

CHF 63.40

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Manufacturer Product NumberVOLTAGE1
Product nameYocto-Volt
USB connectormicro-B
Refresh rate10Hz (DC)
Input impedance331KΩ
Measuring range0..250V (DC/AC)
Accuracy0.01V / 0.5%
Max voltage250V
Accuracy (AC)0.1V / 3%
Accuracy (DC)0.01V / 0.5%
Sensitivity0.01V 0.2%
Supported Operating SystemsWindows, Linux (Intel + ARM), Mac OS X, Android
Driversno driver needed
API / SDK / Libraries (USB+TCP)C++, Objective-C, C#, VB .NET, Delphi, Python, Java/Android
API / SDK / Libraries (TCP only)Javascript, Node.js, PHP, Java
Suggested enclosureYoctoBox-Long-Thick-Black
Made inSwitzerland

Related articles and application examples

 An USB optical telemeter  Voltage monitoring with Python  How to control a desk lamp by USB  Turn your Raspberry Pi into a network multimeter  Interfacing a building with a computer 

Accessories and related products

YoctoBox-Long-Thick-Black, Enclosure for Yoctopuce device (long, thick, black)YoctoBox-Long-Thick-Transp, Enclosure for Yoctopuce device (long thick translucent)Micro-USB-Hub, Micro USB hub with solder pads, for DIY useFix-2.5mm, screws and spacersUSB-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)
Last Firmware24473 (06/20/2016)
Library for Javascript26849 (03/20/2017)
Library for PHP26849 (03/20/2017)
Library for Objective C26849 (03/20/2017)
Library for C++26849 (03/20/2017)
Library for C#26849 (03/20/2017)
Library for VisualBasic .NET26849 (03/20/2017)
Library for Delphi26849 (03/20/2017)
Library for Python26849 (03/20/2017)
Library for Java26849 (03/20/2017)
Library for Android26849 (03/20/2017)
Library for Command line26849 (03/20/2017)
Virtual Hub for Windows26841 (03/17/2017)
Virtual Hub for Linux, Intel + ARM26841 (03/17/2017)
Virtual Hub for Mac-OS-X26841 (03/17/2017)

Add a comment 11 comments

1 - chris j Friday,april 25,2014 17H15

WOW! I've been looking for this product for years. This seems to be the only one of its kind. I can't wait to get one. The Visual .NET support will be extremely helpful!

2 - matter45 Thursday,may 22,2014 3H17

bought the 5v version. needed to measure millivolts. feeding amp readings into pc, and pc is looking after batteries/solar/generator. its been working since Feb2014. the manual for visual basic was extremely helpful including the high level API. I hope you guys come up with a 500v version as well, i need it! Would also be nice to have a 200mv version for better millivolt accuracy over the 5v version. appart from that, very satisfied with the purchase. Highly recommend!

3 - martinm (Yocto-Team)Thursday,may 22,2014 5H48

@matter45: thx for your nice comment. There is no plan for a 500V version, but you could use a small transformer and the Yocto-Volt calibration feature (see user manual, Advanced programming chapter). Regarding the 200mV version, your wish might be granted pretty soon :-)

4 - huntfalow Thursday,january 29,2015 22H38

Hi just wondering but does anyone know if this device comes with the measuring prongs used to measure the voltage?

5 - martinm (Yocto-Team)Friday,january 30,2015 6H06

@huntfalow: nope, no probe included. You get the electronic board only.

6 - chris j Tuesday,february 03,2015 16H27

Any plans to release a PCI Express mini-card version? That would be sweet-- I could install it in my laptop and leave it there.

7 - martinm (Yocto-Team)Wednesday,february 04,2015 7H30

@chris j: It's an interesting idea, but no.

8 - chris j Tuesday,march 31,2015 17H12

I want to use this in VBA (Excel), but the DLL needs to be compiled as "COM visible." I don't have access to Visual Studio-- could you do it for me? Here's a quick how-to: http://www.geeksengine.com/article/create-dll.html

9 - chris j Tuesday,march 31,2015 17H44

Forget that previous comment -- I found something in the blog that will help me. Thanks!

10 - dbug Thursday,august 25,2016 18H33

Is the reading of the voltage permanent, or does that happen only when the value is requested?

I'm wondering if having the device permanently connected could not have a negative effect on the rest of my installation, like upsetting the solar-controller/charger, or possibly drain the battery?

Basically I have a Camper Van, and I need to remotely check the status of the batteries (24v AGM) and in case of problem send a notification, but I would rather not have the check itself make the problem happen faster :)

11 - mvuilleu (Yocto-Team)Friday,august 26,2016 5H20

@dbug: The voltage input is not switched, so it always stay a very small amount of current on the measured object. How much ? The Yocto-Volt has a 330 KOhm impedance, so current = 24 V / 330 KOhm = 0.073mA, so the voltmeter would drain a 10Ah battery in 137'000 hours or 5700 days.

If you want to completely avoid that effect, you can work around this issue by using a Yocto-Relay to connect the voltmeter to the battery only at the time you perform a measurement. Or, you can add a 3 MOhm resistor between the Voltmeter and the battery to create a voltage divider that will divide the measure by 10, the measured value by 10 and the stealed current by 10 as well.

Yoctopuce, get your stuff connected.