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!🤘🏼🤘🏼

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

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.

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 :-)

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.

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.

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

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

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

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

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

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

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

I never thought so careful about this problem. Thanks Scott

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!

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

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

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

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!!

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

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.

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

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.

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)

Home-Assistant again! Nice video Scott!

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

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

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

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

DIY wins again. Awesome GreatScott!

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

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 👍

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

Keep doing this esp videos i love this platform

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

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.

We need to get this man to 2 Million

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

Great video as always👍😀 Thanks for sharing👍😀

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.

Great Scott is with us!!!

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

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

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 :)

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.

Waiting for Sundays, ❤️❤️❤️

My brain is overload but great video GreatScott

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

this my favorite channel on youtube😍

another GREAT video from GreatScott!

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 am a huge fan of your videos!

exactly what i needed thanks!!

Excellent video and a generous giveaway. Nice.

Very good description. Thanks!

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 ) )

Great Video! Thanks a lot Scott!

I love how popular Home Assistant has become.

Lol "handy and shocking" made my day😆

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

Nice project.

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 😊😊😊

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

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.

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.

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

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

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

your beard style looks good

Excelente trabajo, felicitaciones

Thanks for the helpful video

Handy and shocking at the same time - funny😂

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

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. 👍

Wow that was really cool

That's what i needed ... Perfect Timing

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?

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

I'm am happy now!

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

Wow ,I like your idea

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! :)

Very good video. I liked it

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...

Hey, nice video, like always

Great work

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.

I think this would be cool to make and also use it on my solar grid so I can know how much I'm producing 👍❤️

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:))

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

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

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!

SO STRONG MAN !!

I was going to ask you for a vid on what oscilloscope to buy for tinkering like you. Then i saw the part number on this vid and searched for the one you use, holy shyte, thats a 12000 euro oscilloscope. ok nevermind, i'm gonna keep using my multimeter like the noob i am. good vid btw, as always

I ended up on this video because I'm doing the same in my house. I did a lot easier approach without using an external library but just using the CT-clamp esphome sensors support. My issue is that I have an approximate power value since I have no way to differentiate on the load type so everything is calculated as a power factor = 1 like a resistive load. I will make a better analysis on how to integrate the emon lib to have a better accuracy. Thanks

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?

Wouldn't be one of the eastron meters an option? I use the sdm630 which is connected via modbus to a raspberry pi. The values can be published via mqtt.

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

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?