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.

I actually just received my very first ESP8266 NodeMCU in the mail yesterday and have been pondering a project all night. Amazing that you post this today!🤘🏼🤘🏼

"Handy and shocking." A pun across two languages. I love it

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

The circuit shown at 6:42 is a nice idea and definitely works in a pinch, but it's a serious source of error in your measurements and can easily DESTROY your expensive ESP32. Firstly it relies on the precision and drift of the offset voltage resistor divider, which is not insignificant as if you are using 5% resistors, your center voltage and thus powerline measurement could also be off by 5% (or around 16v at line level). Also at startup, before the 10uF capacitor charges to 1.65v, the input of the ADC swings negative, which can seriously damage some devices which don't have stringent input protection. Finally, if there is some fault in the line which causes the transformer to output a higher than expected voltage, this will exceed the power rail of the circuit and discharge straight into the ESP32. You want a circuit called a "Clamper" or "DC Restorer" which will fix your voltage above ground potential (protecting the ESP32 ADC) and allow you to take advantage of the full scale of the ADC input. This also saves on two precision resistors for the voltage divider, and a rail-to-rail buffer amplifier will tend to isolate the ESP32 from any voltages over the supply rails. With an output buffer you can also use a smaller capacitor value, with higher voltage rating and non-tantalum type for safety such as a ceramic disk capacitor. You can also safely add an external ADC if you want to increase your measurement accuracy substantially. (Just remember to sample the max voltage to calculate the zero crossing point for the AC signal, as there is no center offset voltage now) There is no fundamental difference between your expensive power meter and a circuit you can build at home, you just need to find all your sources of error and minimize them! :) Here is example circuit for reference tinyurl.com/y2aoed7z

Power meter: shows -43W real power Great Scott: "the power meter still works perfectly fine"

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

this dude read my thought i wanted to do that exact thing

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

Your channel is always a great place to watch some cool videos utilizing microcontrollers like the ESP32. It’s such a versatile controller to have around! I’ve used them for all sorts of things, I had one hosting an access point with a simple html interface to control a project I had made.

"which is handy and SHOCKING at the same time" me: i see what you did there

Great video, I love incorporating tech into homes like this. I would also like to say thank you for making videos, you have been such a huge inspiration to me and a large reason why I want to get into electrical engineering, much love from Phoenix, AZ.

The CT Clamp component in ESPHome is based of the emonlib library and has very easy integration, it even allows you to use a higher precision external ADC such as ADS1115.

Some points from my experience building The same thing for my own home: if you can't find a 12-volt AC former, you can step down the voltage just using a standard voltage divider with 10 or 20 times the resistance on the upstream resistor (depending on if you're in the Europe or US). If you want it isolated, you can use a one-to-one speaker transformer, or they have potted transformers the one-to-one ratio specifically for this task. Also the ESP32 ADC has abysmal accuracy without some sort of filtering in software. I actually used an Arduino nano to measure the current on the two phases coming into my house (US) and pass that off to an ESP8266 to send to my server. The values I got out of this setup were within 0.1% of what the electric company said I used.

I had something like that in mind for a long time, great job!!! Adding a temperature sensor on a solar heater and a power relay we could remotely power on its internal resistor when we need it (without have it on all the time). We can also watch the power consumption for security reasons and be able to turn on the outside lights remotely, and so on. Home (and not only) automations with microcontrollers is so simple this days and we can do so many things that really worth spending some time learning how to program them which is pretty simple and a great way to learn children how and why programming is fun and why maths physics and chemistry is necessary most of the time on whatever we do :-)

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

I have literally no idea what I'm watching But I still love his videos :)

I've recently done this myself, well similar. I wrote my own code in the IDF and used the SCT-013 current clamp so I could measure the whole house current. No touching of live wires needed since it's a clamp rather than pass through doughnut. Works very well but I am assuming voltage since I don't have an isolating transformer yet to measure it. That's the next upgrade!

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

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

Great Scott, love watching your videos! It improved my electronics knowledge by a ton!

I never thought so careful about this problem. Thanks Scott

Now I need to figure out how to measure a 3 phase power which I use in my home now. Great video for me to get started. Thanks!!

This is one element of my thesis paper on college. Those stressful days.

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

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

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.

Im always so fascinated by your projects and even more how economical you make them even though you live in germany where gross can shoot up very high, keep up the spirit scott! (Im from slovakia, so you can understand the meaning of the comment)

Thanks again, great explanation of a rather complex setup in a short period of time.

This is just what I needed. Just in time. As always, great job :D

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

Home-Assistant again! Nice video Scott!

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

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 👍

DIY wins again. Awesome GreatScott!

Fantastic work, dude! And really interesting project! 😃 Stay safe and creative there! 🖖😊

Great video as always👍😀 Thanks for sharing👍😀

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

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.

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.

Keep doing this esp videos i love this platform

I love how popular Home Assistant has become.

Great explanation of how different loads effect the phase angle between Voltage and Current BUT to keep things simple with respect to monitoring power consumption (as charged on your power authority account) have you considered just monitoring the pulsing LED on your power meter. I suggest this for one of your excellent UKposts videos.

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

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

Hi, thanks for the video! What would you recommend for measuring the power consumption of an industrial three-phase load (600vac x 40A) using what you've taught on the video?

Thank you for the great tutorial, Just a quick question, I have never used my oscilloscope to measure 220v AC, what is the safest way to do it without damaging my oscilloscope? Thanks again

GreatScott! glosses over a summation formula that probably has most viewers' eyes glazing over. "And just like that..."

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

Some of the new/Modern US home power meters actually have debug output ports. You can hook into those if you want, they are read only and not encrypted in any way. So this may be even easier to access the data.

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

Das waren grad "Grundlagen der Elektrotechnik" (1.Semester) und "HM 1 " ( Höhere Mathematik I ) in 10 Minuten. Der Mann hats echt drauf ! :=)

this my favorite channel on youtube😍

We need to get this man to 2 Million

Fantastic, thank you! I have been looking for something like this, my current energy monitoring system does not measure line voltage. I have two air sources mini splits which have an awful power factor, somewhere around .2 when the compressor is not running and it bugs me that I cant measure exactly how much power they use. This will be added to my project list.

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 :)

Waiting for Sundays, ❤️❤️❤️

Lol "handy and shocking" made my day😆

exactly what i needed thanks!!

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

My brain is overload but great video GreatScott

Great Scott is with us!!!

I am a huge fan of your videos!

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

Excellent video and a generous giveaway. Nice.

another GREAT video from GreatScott!

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

your beard style looks good

Very good description. Thanks!

This is what I've been wanting to do, though A) I want to do every circuit so I need about 30 channels of sampling, and B) I don't really care that much about precise values, calculating reactive power, getting RMS values, etc. I just want some relative values so I know what circuits to go after as hogs next, or which can be adjusted to run primarily in the daytime when the solar panels are producing.

I nearly missed your video caz i was listening to spotify :D

Great Video! Thanks a lot Scott!

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 ?

I inspired from your videos. Thanks for your great effort and keep on posting. Very useful one. I request you to make a video on, Which is the best ceiling fan regulator type ( Electric (Resistive), Triac based (smooth control), Step control (Capacitor based ) )

I would have liked more explanation on your simple circuits and the choice of your components. For your offset circuit i understood the use of the decoupling capacitor and the voltage divider but i don't get the use of the 200ohm resistor and the inductor...

Have you used the same hall sensor in your home distribution box as the one in the beginning of the video? That hall sensor can only measure up to 5A which sounds short. Love you vids btw! :)

Amazing. I want one. Could you please share the schematics for the auxiliary components?

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 😊😊😊

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

What about 3-phase (like an split airco system), is it as simple as measuring the 3 phases and adding them together?

Handy and shocking at the same time - funny😂

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. 👍

Nice project.

Great video as always, But I have a question, would the transformer not influence the phase of the measured votlage? Wich will make the power factor and active power not precise . Or was that accounted for in the code ?

"I have the goal of lowering mine though" Says the guy with a 3d printer, a cnc mill, and literally every high current device XD. Aside from that I really love your videos.

Hey, nice video, like always

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:))

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.

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.

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

@GreatScott! what if I want just to use an Arduino and display the measurement in Lcd what I should do.

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?

Thanks for the helpful video

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

@GreatScott!! : Awesome circuit . I was in search of a product like this . And how about the android app needed to ti display kt

"Hook up to pin 34 and pin 35 of the esp 32"........DEADLY DAH!😂

Excelente trabajo, felicitaciones

Great video Scott. Is it possible to do this to measure consumption in a company? Three lines of 110 volts each at 60 Hertz with consumptions of more than 100 amps per phase? 🤔 Greetings from Cali Colombia

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!!!

I had a doubt Scott, why dont you use ACS712- Current sensor and ZMPT101B- Voltage Sensor and make it as simple as possible and well portable as well with no external circuits as well?