DIY ESP32 AC Power Meter (with Home Assistant/Automation Integration)

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Parts list: (affiliate links)
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In this project I will show you how to build an ESP32 AC power meter that can be used with your home assistant setup. That means I will firstly explain how to actually measure and calculate real and apparent power along with the power factor and then I will show you how to use the ESP32 in combination with some complementary components in order to create the power meter. Let's get started!
Thanks to JLCPCB for sponsoring this video.
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Music:
2011 Lookalike by Bartlebeats

[@Asu01]

This is exactly what I need, thanks! Now I can monitor how much power I'm drawing from my neighbour's power grid and adjust my load so it won't make any suspicion.

[@greatscottlab]

Glad I could help!

[@Asu01]

I'm happy you glad, @@greatscottlab. Sorry for the late reply, my neighbour's Wi-Fi was down for a moment.

[@geetanshgautam]

Lmfao

[@prathambhat2803]

😂😂

[@galladeblade6001]

@@greatscottlab I think you didn't understand correctly. 😅

[@ZeroMass]

My Sunday morning is complete... Coffee and *GREAT SCOTT!!*

[@greatscottlab]

Enjoy!

[@POWERFPV2024]

I have learnt so many things by watching your video and again a big love from India ❤️❤️👍❤️❤️❤️❤️

[@Evgen-Evgen-Evgen]

Oh lucky you, it's sunday night for me((

[@SriTejaChilakapati]

@@Evgen-Evgen-Evgen Well, it's past midnight for me and I'm technically watching this on a monday 😅

[@kishoreksm8366]

It's 1.30am here..

[@adityag.5372]

Hey! This video doesn't start with the word "recently" 😅😅

[@_BSG_]

Vah bhai vah

[@allbeit582]

ha ha

[@DJ-Manuel]

I can reccomend shelly devices, most of them have power meter feature integrated, there are aswell a dedicated powermeter wit power clamps. Even 3-phase is available. And they can be integrated very useful 👍

[@Goni0121]

thanks man. I needed a tree phase monitor and this is a good, easy to install and simple solution.

[@AmplifierWorld]

What a great energy you delivered while saying " stay creative and see u next time"

[@Felix-ve9hs]

I just installed Home Assistend on my Proxmox Server and was searching for a "smart" Power Meter I could use with it, perfect timing :D

[@solieeeeeee]

There is a simplier solution for power measuring which is called PZEM-004T (with great accuracy of measurements too!)

[@floris00]

If you have a smart meter (which a lot of people have nowadays in Germany and the Netherlands) you can hook up a RPI to the P1 port of the meter. That port spits out a lot of info about your electricity and gas usage (if you have gas at your home). You can also integrate it very easy with Home Assistant.

[@tomwilliam5118]

It's always nice to see the the face behind The Voice the videos I watch

[@nicholasbishop01]

We just did this for our EE senior design project back in the spring! We won first place!

[@Private_Duck]

I really want to see that tesla coil. I've been watching your videos since i first started electronics about three years ago. I still cannot believe that you didnt make a tesla coil that can make some interesting arcs.

[@thetechboy8529]

I am waiting for this video for a long time. The most informative video on this topic on KZbin Thanks sir

[@JohnBoen]

I came on line to just now literally to search for someone who has done this project - nice timing :)

[@vaibhavbhasin3861]

Its super cool , but its really difficult when you start. For beginners point of view, various topics like working of esp32, how data came into mobile app, current sensor calibration etc are alot of things to learn. 🤖 All the best to all and do share your experiences. 👍

[@HemonDey]

Thanks for this video, I enjoy watching your channel and its great content. I've created an energy metering system in my house using existing energy meters with pulsed outputs, basically gives a pulse for each 1whr consumed - this significantly reduces the complexity of the project as it means only having to count pulses to get near instantaneous energy consumption values. Also if you also monitor milliseconds between pulses, you can work out near instantaneous power consumption as well. These meters are very common and easy to obtain, and they also by their nature have to be reasonably accurate - an added bonus is that they also typically come in a small form factor (1x din width), and pulses are isolated from mains. I populate the energy/power values directly into a time series database (Influx) and graph with results using Grafana.

[@georgei2480]

I'm a big fan of making cool DIY projects that you cant already buy on the market. The issue I have with this project is that you can already buy a commercial version of this product that will be more reliable and cheaper than making it yourself. The Sonoff Pow can be bought for around USD 11, It has a built-in power consumption tracker, it has a built-in relay for remotely switching the appliance on and off, it is in a clear professional enclosed, and it can easily be modded to work with home assistant. Unfortunately, there is no reason to make your own. It will cost you just as much and you will have a lesser product.

[@1976kanthi]

Thank you for making excellent electronics videos. You are my favourite electronics KZbinr!!!

[@theoneohmresistor]

now you can get similar thing for $8, and with a relay... great stuff

[@vishva8kumara]

I'm running two circuits, one with grid power supply only (high-power appliences) and another with fail-over from an inverter/battery that has low power appliences and all lamps. I also need to monitor battery charging and discharging currents with voltage, so I could measure efficiency and battery health. I think one current sensor would be enough on battery +ve terminal ; should give -ve values when charging and +ve when discharging.

[@sayantanmaiti2513]

I would suggest to use those Hilink 220v to 3.3v AC-Dc converter for directly run esp from mains

[@prathamkalgutkar7538]

It won't be Suitable here, Cause those Generate Stable 3.3V DC while here we need to Sample the AC Voltage which Fluctuate Constantly

[@sayantanmaiti2513]

@@prathamkalgutkar7538 i'm talking of supply to the esp

[@vaibhavhayaran]

exactly what i needed thanks!!

[@greatscottlab]

You're welcome!

[@diniitotoom2526]

this my favorite channel on youtube😍

[@АлексейЕрошкин-ш9ш]

This video is cool as educational stuff, but in reality it's much easier, accurate and maybe even cheaper to buy something like sonoff pow r2 (not an ad, just an example) smart relay with all this measuring functions included.

[@anilmaharjan5610]

Hey, I saw your face for the first time :) After watching soooo many videos where I have only heard your voice. :) Nice to see you :)

[@RomanoPRODUCTION]

DIY wins again. Awesome GreatScott!

[@rubabmubarrat]

your beard style looks good

[@electromatic138]

I hope PIC microcontroller is on your wish list

[@rameshprakash3887]

Awesome bro.... This is from India... Vera level.... Thank you for the video...

[@marekklucka4407]

Hi Scott, you should definitely do a follow up and some finalization of this. I need to do exactly this, but the situation is that I want to see each of the info about consumption per beaker, so the question is, do I need to have ESP for each of the breaker? Or is there possibility to combine them? A lot of questions which I think you've been working on in the past, so your experience would come in handy. Thanks

[@KonradSzproncel]

I'm using energy meter with pulse output wired to esp8266 and just counting pulses during time. Class 1 IEC 62053-21 45A 230V 1000imp/kWh - everything is simple. Paid 54PLN (~14USD).

[@Trught]

Same here, 1 module 1 phase or 7 module 3 phase maneler energy meter output 800 impulse/kWh very cheap and accurate enough for me, esphome already integrated pulse count energy meter.

[@swaroopcool22]

waiting for a video on "main electricity safety essentials". What care should be taken when handling AC 230 V

[@elesjuan]

This is neat, but there's an easier way to do this. Check out the circuit setup energy meter, which is compatible with esphome right out of the box. I put together a complete system for under a hundred bucks using his stuff.

[@roedyhellyeah]

you also have a P1 port that you can use. and an Easton meter is not that expensive and MID certified

[@traditionrider]

Handy and shocking at the same time - funny😂

[@bsand1746]

Your videos are awesome man. Please keep it up! Thank you

[@electronic7979]

Very good video. I liked it

[@BrianVanderbusch]

The timing of this video could not be better. I was just looking to create a power consumption module for my 3D Printer and CNC mill bench

[@notofinterest]

Simply interfacing the blinking led of your smartmeter with a ldr probably will also do the job.

[@blackbird8982]

What about using an optocoupler as a reference point for timing?(zero voltage detector as an interrupt)

[@richielonewolf7725]

Lol "handy and shocking" made my day😆

[@herik63]

Wonderful exclamation, thank you so much from a old electronics technichian :)

[@abdulkadirgozuoglu8946]

You may use ordinary 2-3w 230v to 12v transformer as voltage sensor. So that you can fit in small area. Thank you for very usefull application:))

[@FunBots]

Great Video! Thanks a lot Scott!

[@RanjeetSingh-nr5sg]

Please suggest how to choose or decide the calibration value to get the right readings.

[@rahulthoppil1261]

Hi Scott, I am a great fan of yours. I see tons of equipment like in a lab. What do you do as a job? All the best for your efforts. You are a great teacher 😊😊😊

[@affehombula6840]

Hey, nice video, like always

[@mleitner0]

This is cool I did this the far using cheep aliexpress bluetooth AC meters. But not as small as this one.

[@d3891]

very interesting would have been great to see a little bit better how it was wired to the distribution

[@tvishmaychoudhary69]

Hey what about the Tesla coil you have talked in the yt stories???

[@greatscottlab]

The video will come out when it is done

[@tvishmaychoudhary69]

@@greatscottlab ok☺

[@totolastico]

i was just looking for something for my house ! thank you, i'm gonna look at all this stuff. :-)

[@aramt.4519]

Hey Scott, I did something similar last week. I have a digital Power meter (starting at 35 Euro on Amazon for 3 Phases) which has a digital S0 Pulse output. You can read these pulses with the ESP and feed them to your mqtt broker. I used ESPEasy (no promotion here) which works completely without programming. You actually cannot read the power consumption in real time, but rather could calculate an average value inbetween pulses (in my case 1000 pulses per kWh). Maybe you want to look into this before operating on your distribution box and make it VDE compliant :D Grüße aus Frankfurt! Du machst echt gute Arbeit, weiter so!

[@executive]

I love my cheap electricity. Never have to worry about wasting my time on this.

[@engineereverything9055]

Please make a device to measure and limit water consumption as well it would be great!

[@laxmiram19]

Big fan from india. Great videos 😊 Take care of your health.

[@Od3o_ela_sabil_rabek]

06:42 what's this circuit please mention the name of this one

[@letenof]

The AC voltage is both positive and negative. ESP32 ADC input accepts only positive. The circuit adds a positive offset (half of 3.3V) so that negative voltage will never reach ESP32 and damage it.

[@greatscottlab]

It is a voltage divider.

[@Od3o_ela_sabil_rabek]

@@greatscottlab Ok Thank you for you're attention

[@BILL1986able]

Did you consider using an ACS712? If yes why didn’t you use that to measure the current?

[@BretonWiessner]

I'm am happy now!

[@hansdegroot652]

I use the esp8266 to read the p1 port os the smart meter. Very cheap en works super.

[@nashettysatwik8063]

Hlo great Scott,please solve our doubts regarding the project.

[@xsirfr1958]

I understand the safety aspect of using an isolation transformer in this project for sensing the voltage. But, for low loss, such transformer must be large and expensive. Since you know which mains wires are hot and return (connected to earth) can you simply use very large valued resistors, to form an ac voltage divider, capacitively couple the signal to a VDD/2 bias string?

[@RedShift5]

Skip 06:00 to 06:05 if you like to live dangerously

[@compubyte2010]

ok, you can see it on your phone,, that's cool.. .. a silly question . as it's for HA . can it be integrated into my display for HA?

[@gustavofoss2280]

isnt the area underneath the instantaneous power waveform the total energy consumed? Not average power. The sum of the area divided by time is the average power. Two different but related concepts.

[@firefoxik75]

I tried something similar with ESP32, just to realize that ESP32 internal ADCs are way too noisy for the job :-( And also non-linear as well, so I endup with modifying emon library to support ADS1115, and now the readings are within 1% accuracy. You can try by simply feed some stable analog voltage to the ESP32 ADC and read its value, it will fluctuate a lot !!! Otherwise good video mate ;-)

[@StefanWelker]

Thanks Scott for this. I wanted to make one myself a while ago and I wonder how much difference does it make just assuming everything is resistive load it seems to me that they are really few capacitive and inductive loads in a household even if there are some they might even cancel each other out. I think a similar device albeit with a little less precision can likely be made by just using the current sensor, do you agree?

[@stepheneyles2198]

That would be very inaccurate as the incoming voltage would vary during the day. You need both to make proper measurements.

[@nunolourenco1532]

I have been doing this by reading the blinking led in the power meter. Also read the needle in my water meter but with less success (turns out that the water company doesn't like IR sensors to close to the meter...). Too bad they are outside (no power source ) and my domoticz was to be turned off. I'm now researching home assistant to reset these.

[@arduino2914]

Thanks for the helpful video

[@djmello7305]

Wow that was really cool

[@omemanti]

great, please make a video doing this with a SCT-013. im stuck with this one.

[@mutthunaveen]

Good project and and neat UI. Have you used raspberry pi for this project? or it is ESP standalone? can you please confirm

[@Trught]

For existing power meters with noninvasive led impulse output can be read with photodiode. Gas meters with magnetic impulse output can be read with reed switch, utilize cheaper esp8266, already integrated into esphome

[@Beansswtf]

Not sure why, but my outputs are just massively off... I can adjust the calibration number to get it to match, but then as soon as the current changes the output is again massively off.. Using esp32 with ads1115 and the standard emonlib library, but with a slightly modified calcIrms function to take an array of readings from the ads1115 as an input variable, instead of using the built in ADC.

[@RoyalTech_2024]

Hi Great Scott, thanks for your videos. Can you make a MIDI controller using arduino. I know you made a launchpad. But something like a piano with control knobs? It would be great.

[@greatscottlab]

Yes I can

[@RoyalTech_2024]

@@greatscottlab 😄 I know nothing you can't. But can we expect a video?

[@greatscottlab]

It is on my to do list. But it will not happen anytime soon

[@RoyalTech_2024]

@@greatscottlab Its ok. Thanks.

[@YourAliasIsNotAvailable]

The average power consumption is rather high compared to what? Regarding private households the energy consumption lowered from >4500kwh to like 3500-3000kwh for 4 persons since 2002 in Germany (Energieverbrauch Abschlussbericht BMWI 2002). And thats without electrical water heating and without electrical heating. As a lot more people tend to have multiple of those crappy electric heating devices in

[@filipsimurda5236]

Can you make video about multimeter autorange?

[@pulkitjoshi1078]

It was really weird to not hear :hi there

[@harshprajapati6851]

Hey can you help with how to use the CT coil of broken multimeter in this project

[@jost459]

Great project. What is tolerance compare to Metrahit meter? Can the ESP meter measure below 1W too? You know IT Equipment for example PCs it is only allowed to consume below

[@Mctacchi]

Hello nice project.In the future use this IC M90E32AS from Atmel.

[@AhmedEu]

pls make a video on pzem 004t power sensor

[@kathyquantrill5985]

I was wondering what is the phase relationship between input/output for the mains voltage sensing transformer. There may be a few degrees lag here.

[@Mrfoobaer]

Do you somehow have to compensate for the phase shift the voltage transformer makes? They are usually a bit out of phase and it's also load dependant

[@sdgelectronics]

It'll never give accurate readings with this method as a standard transformer is too non linear and also adds phase shift. A proper PT or divider network is the only way to get good results

[@bbascyber]

@10:41 -42.78W and power factor -0.25! What was the load?

[@Flnetic]

Hey have you explained the circuit at 6:43 anywhere? Thanks!

[@ganeshg1870]

Is it possible to integrate this concept into nodered flow? @GreatScott!

[@makeinheaven]

I'm glad to see your face. :)

[@Karthi14314]

Hi brother ... Can u please tell me what is the best replacement for NJM5532D DUAL OP AMP.. because I didn't found njm5532d so please suggest me better replacement ic (microphone booster project)... How about NE5532D DUAL OP AMP

[@DreadQuill]

I have a question about the esp32-s2-wroom-1 series... and maybe the esp32 in general. I am completely new to programming and got this for my birthday. After some libraries and coding I have gotten an hc-sr04 and a dht-11 working together to output data to the arduino serial monitor... my question is on WiFi do I have to do the network and password or is there a way to just communicate wireless without a network??? I haven't really done much with programming before??? Thanks for any replies!!!

[@AgentOffice]

We need to monitor every watt

[@jacobnicolas7x7]

Will you make a power conditioner, for audio equipment? Its a way to get rid of the 50 hz buzz and to filter it by using 230v to 230v transformator. Its used in professional music studios. Or will u make a wideo about the ground loop effect and what can slove this buzz annoying problem. Greetings

[@dineshth6711]

It's GREAT, Scott bro!. I have a doubt, bro. How did you calculate the components value for the cicuit at the time 06:43 in this video?. Thank you for sharing your knowledge and efforts, bro!

[@greatscottlab]

It is just a voltage divider. I made a basics video about resistors. You can see it there. Or just google it.

[@dineshth6711]

@@greatscottlab Thank you, brother!, I will see to it. It's nice to see a reply from you, brother!.

[@sasankaalwisedirisuriya5773]

Hey Scott how about a powerful solar inverter diy

[@baishakhihaldar2505]

Please review transparent batteries. (If you can buy one)

[@jksr127]

Hmmm whz didn't you go for this 16€ PZEM-004 Module?

[@victortorres2080]

Freund, gutes Projekt, mit viel Potenzial für die Herstellung. Gibt es etwas, das mit Arduino + WiFi ausgestattet ist?. Schöne Grüße.

[@johannglaser]

Hi! Which scope probes did you use to measure the mains voltage and the current? Or asked differently: which would you recommend? :-) Thanks, Hansi

[@VAKUL-DC]

Thank you. I will cehck on the emon code. but do you know if i can connect multiple current transformers and use a few more pins on the esp32. will the controller be able to handle 4-5 CT coils ?

[@creazychannel]

What do you think about India?

[@BaratheonBC]

would be nice if you had explained your circuit a bit better, but thanks for the video

[@anjusingh8781]

Do a collab with the hacksmith