Combine a Yocto-Volt with a YoctoHub-Ethernet to get an autonomous appliance with built-in network connectivity:
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.
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The YoctoHub-Ethernet is a Fast-Ethernet module that can host three Yoctopuce modules to access them remotely. It can be powered either by a USB Micro-B cable, or directly from the Ethernet cable (PoE compatible with 802.3af standard).
Three Yoctopuce modules can be connected directly, one of which can be fixed directly on the YoctoHub-Ethernet and connected using a Board2Board-127 connector. More devices can be connected thanks to the YoctoHub-Shield extension. The YoctoHub-Ethernet can power Yoctopuce devices up to 2A.
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!
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!
@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 :-)
Hi just wondering but does anyone know if this device comes with the measuring prongs used to measure the voltage?
@huntfalow: nope, no probe included. You get the electronic board only.
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.
@chris j: It's an interesting idea, but no.
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
Forget that previous comment -- I found something in the blog that will help me. Thanks!
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 :)
@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.
Dear Sir, it's possible Yocto-Volt connect to Arduino board?
@anges: No. Mainly because Arduino boards dont have USB host support.
This device is really great! I'm using it to detect when an intercom speaker becomes active (makes a buzz). It works very well, but I've run into a small issue that perhaps the API developers can help with. When I daemonize my code in python, I see the device arrival and removal happen and then it stops working correctly. I assume this has something to do with the fork and USB device permissions. I am running as root though. Please help if you can.
2017-05-31 14:15:59,677 - __main__ - INFO - May 31 18:15:59
2017-05-31 14:15:59,677 - __main__ - INFO - Device arrival : VOLTAGE1-90A2B
2017-05-31 14:15:59,678 - __main__ - INFO - - VOLTAGE1-90A2B.voltage2
2017-05-31 14:16:02,003 - __main__ - INFO - Device removal : VOLTAGE1-90A2B
2017-05-31 14:16:02,003 - __main__ - INFO - VOLTAGE1-90A2B.voltage2: 0 !INVALID! (new value)
I figured out my issue. I needed to instantiate the yocto API after the daemonization.
@mrd: ok, next time just contact Yoctopuce support directly. :-)