# Measuring voltage

**URL:** <https://forum.qoitech.com/t/measuring-voltage/294>\
**Category:** Support\
**Created:** [May 28, 2019, 6:37am UTC](https://forum.qoitech.com/t/measuring-voltage/294 "2019-05-28T06:37:05Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![eloi](https://avatars.discourse-cdn.com/v4/letter/e/3ec8ea/32.png) [@eloi](https://forum.qoitech.com/u/eloi)\
**Post date:** [May 28, 2019, 6:37am UTC](https://forum.qoitech.com/t/measuring-voltage/294/1 "2019-05-28T06:37:05Z")

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Hi,

I have an IoT device and I would like to know how the voltage varies when there is a communication. Is it possible to do it with Otii? Which should be the assembly to do it properly? It has to be done with sense?

Thank you!

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**Author:** ![bjorn.rosqvist](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/bjorn.rosqvist/32/238_2.png) [@bjorn.rosqvist](https://forum.qoitech.com/u/bjorn.rosqvist)\
**Post date:** [May 28, 2019, 6:42am UTC](https://forum.qoitech.com/t/measuring-voltage/294/2 "2019-05-28T06:42:50Z")

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Hi,

To give you the best answer, I need to understand your set-up but yes, you can use Sense+ or/and Sense- to graph voltage.

Best regards,  
Björn

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**Author:** ![eloi](https://avatars.discourse-cdn.com/v4/letter/e/3ec8ea/32.png) [@eloi](https://forum.qoitech.com/u/eloi)\
**Post date:** [May 28, 2019, 6:52am UTC](https://forum.qoitech.com/t/measuring-voltage/294/3 "2019-05-28T06:52:46Z")

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I have an IoT sensor supplied by a battery:

 ![image](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/832484a4004dfacdc793d3a3f5e742858b15f3ac.png)

Connecting the sense like in the image above is enough to get correct results or the setup has to be different?  
I only want to measure the voltage drop when it is connecting to the network.

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**Author:** ![bjorn.rosqvist](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/bjorn.rosqvist/32/238_2.png) [@bjorn.rosqvist](https://forum.qoitech.com/u/bjorn.rosqvist)\
**Post date:** [May 28, 2019, 7:37am UTC](https://forum.qoitech.com/t/measuring-voltage/294/4 "2019-05-28T07:37:10Z")

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Hi,

I suggest something like this:

 ![image](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/b3423dae6703c0a24459027ac8bb381a27ada8a7.png)  
By using ADC+/- connection, you are also able to see the current consumption of your sensor.  
Enable the channels ADC in current tab and ADC in voltage tab.  
Size of shunt R depends on the measurement range.

Remember that AGND connection will give a GND connection to USB GND of your computer.

Best regards,  
Björn

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<div class="post-metadata">

**Author:** ![eloi](https://avatars.discourse-cdn.com/v4/letter/e/3ec8ea/32.png) [@eloi](https://forum.qoitech.com/u/eloi)\
**Post date:** [May 28, 2019, 7:40am UTC](https://forum.qoitech.com/t/measuring-voltage/294/5 "2019-05-28T07:40:52Z")

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Thank you very much!