Can we measure the AC voltage with Arduino

Projects General Guidance
1

Can we measure the AC voltage with the help of Arduino and it transfer or send to our mobile app how can we do that ?

2

You need to do your best with writing the code, and provide a hand drawn wiring diagram then we can try to address any issues you might still have.

3

If you mean household AC voltage, see this tutorial for a safe way to proceed:

https://docs.openenergymonitor.org/electricity-monitoring/ctac/how-to-build-an-arduino-energy-monitor.html

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4

I am just asking that how can we measure AC voltage it can we done with resistive network or using sensor how can we done and which method is the best to measure AC voltage with Arduino

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  • Please tell us exactly what you want to achieve.
6

That depends on the voltage and frequency, which you forgot to state.

7

Resistors are for DC generally speaking, not AC.

8

I measured the main supply AC voltage with Arduino

9

Learn how to use the forum and you will get better results
https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum/679966

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10

It have 220v Ac voltage with 50hz frequency

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  • Do you want to measure the value of the AC mains or just if it is present ?
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The safest method to measure 220 VAC is the OpenEnergyMonitor approach linked in post #3, using a small transformer.

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I moved your topic to an appropriate forum category @abhideval .

In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.

This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

14

the safest way to measure mains 250volt AC is to use a transformer to reduce it to a low voltage signal output depending on the target microcontrollers ADC range
be very careful when connecting the 250V AC to the transformer make sure you have a two pole isolating switch in the supply circuit

Generally microcontrollers ADC read a DC level so you will need to offset the low voltage AC signal to suit the ADC DC input range
you will then need to sample the signal over several cycles to calculate the RMS value

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If you intend to make a measurement of the ac mains supply voltage I'd suggest you find another project as working with mains electricity is not for beginners.

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This module is commonly used to measure mains voltage.
Why do you want to know mains voltage. It's usually quite stable.
Most projects here are about measuring mains current.
Leo..

Edit: Please note that there are safety concerns around this module. Same goes for ACS712 modules, some relay modules, and a G3MB SSR module I recently wanted to use. Some Chinese designers are too careless with human safety.

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17

The mains voltage varies from zero to some positive voltage, back to zero and then to some negative value. This, as you know, happens 50 times per second. So, tell us what voltage would you measure at any instant in time?

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