Make your own Power Meter/Logger 

I sometimes struggle to find the proper words to express how much respect I have for projects you so openly provide. Thank you!!

I'm really glad you took your time to properly design the board and have it compact and neat

learned more from your channel in the past month than an entire year in school love your channel!

​GS, This is one fantastic project. Made one and even added a few mods to the code. I didn't have to buy anything new or substitute. I had everything already and was going to design and code this exact design from scratch, but you did all the hard work for me, and I thank you for it. Also, thank goodness for these cheap modules. This and many other projects would not have even been possible only 5-10 years ago, without these cheap and wonderful modules from China.

Your channel is amazing!!!! Thank you so much for being around!!

Perfect. This is exactly what I am looking for to experiment with small garden wind generators and other projects. Thanks for showing me the way.

Wow, I just realized how much time and effort it must take to make these videos. And this is only 6-7 minutes long. Damn.

GreatScott! Nice explanation and a beautiful simple integration project. I Like!

Awesome video, I really like how you created the data logger for power consumption, this will prove really useful for evaluating and diagnosing battery life.

A smart engineer with a German accent makes his own power meter/logger but when not satisfied with just an oled screen, adds a data logger too, Great Job!!!

Man... I am happy to find your channel. Great videos!

exactly what I've been looking for mate... awesome, will keep you posted

I think this is one of your best Scott. Thank you

Happy holidays, always quality content here, nice project

This is yet another class project.

The best part about this video for me was the project file on easyeda. Not because I want to build this myself, but because I kept searching for a website like that and it is really useful for me. Thanks.

Just got all my parts in the mail today. I'm going to rig one of these up.

This is a really great little project !

That's awesome DIY project for your video list. I will try this one. Thanks to uploaded it.

for the logging you can use an CSV file and open it with format and it's pretty easy to create for example per each line you can have: TIME,VOLTAGE,CURRENT just use comma (, ) as separator between you values and excel should be able to put them in column for you

Thanks for keeping me creative and sure you will see me next time !

Thank you so much for this video and saying to use SdFat library. I have lost a lot of time, not knowing why I could not open a file on a SD card with a Chinese SD module and the SD library. I found nothing about it on many forums. Now it works ! GREAT !!

Your Videos Are Amazing!! The Camera movement is professional

Wonderful approach to build a custom power meter

What can I say , simply clever , thank you again Scott

Your SdFat really solved the same problem...Lot of thanks Great Scott!!

RU-vidrs like you make me want to get a degree in electronics engineering!

great project sir! very much innovative and out of the box

I needed this last year and just abandoned the project, (cause I'm a beginner and couldn't find how to do it) will resume it in a few weeks when I have time. Thank you!

Nice work. You build beautiful diagrams

Awesome video Scott!

You are so creative :o all of your projects are hightest quality, and I learned more about electronics watching your videos! Thank you for inspiring me be better electrican! ;)

Very Nice Work! Congratulations!

GREAT SCOTT! ( I love that expression ) Another fantastic video.

Thanks! This is exactly the type of system I need for monitoring battery charge and discharge times. I plan to use the larger 2.42" OLEDs.

I really liked the way he skimmed over the code, It's nice to see the code without downloading the file :D.

I am always waiting for your videos Keep going :)

Wow, very amazing project

I like that little character/dot display you're using

Really enjoyed this one. Thank you for sharing.

Wow, impressive 👌thanks, loved the display unit

Danke für die Screenvideos beim Programmieren und PCB Layout, sehr angenehm

this is awesome, thanks for the sharing. especially the sdfat library.

Awesome project!! You're a genius!

Love Your videos! Pls make more of them!

Great video. The resolution of the OLED display is not set correctly though. It is not set to the maximum resolution. Edit the library file in order to set the correct resolution 128x64 pixels .

congrats on 420k subs

Very Nice , Thanks GreatScott!

dude, i love your video. it help a lot of people :)

Great again Scott, thanks for sharing

I really like this one, I managed to buy all the modules for less than 5 bucks. I already have an UNO lent to us by our teacher.

Nice video! Tips: Output it into a csv formatted file instead and you can directly open it into any program suitable. Then you dont have to copy paste the rows :)

I love the INA219 module. I once used one to replace an expensive stepper motor with a far-cheaper and more powerful 12VDC gear motor. I had a n arm on the shaft of the motor, and I just blocked it so that it could not turn past the points where I wanted it to stop. Then I would start the motor turning and monitor the current. When the arm hit the block, the motor would start taking more current, and I would know it was time to shut it off. It was self-calibrating! It worked perfectly once I thought to drop a little super glue on the flange and motor shaft, because the motor was so powerful the flange set screws were not enough. Hint for your data logging: Have your Arduino log all data to a .csv file. Each line is a row of data, separated by commas, and you can even have the Arduino do some of your calculations for you and include them on the line. Stick the SD card into your computer, double-click the .csv file, and it opens up in Excel, each data point in it's own cell, nice neat rows and columns. Select a column, select "Insert", and insert a graph of the data, easy-peazy. Lastly, I know this video was created four years ago, but we now have some data logger modules. I got two of the ones you just plug an Arduino Nano into, and I got one of them working yesterday. The module gives you everything pre-wired, including a real time clock module. So you can time-stamp your data in the .csv file, you just need two more commas and columns, and you can see when that spike occurred. I like this data logger. I intend to program it to accept a string from another Arduino and log it, with a time stamp, to a .csv file. The string will be a pre-formatted string sent via SoftwareSerial.h. That way I have the complexity and memory requirements of the RTC and SD card set aside from the Arduino doing the real work, leaving precious memory for other things.

I was looking for something like this...thanks

Congrats on 434,571 Subs haha Great stuff Great Scott!

this one was really nice sir!!!

Currently I'm working on a similar project, but with a different approach. I try to use an ESP8266 and a Raspberry Pi, to build some kind of distributed power measurement system, for festivals, camps, larger installations an so on. Your video really helped with suggestions regarding the use of an SD-card and a LiPo-Battery, thanks a lot! Greetings from the "Lipperland" in Germany :)

I LOVE your channel.

I know that this is very old, but one suggestion I have, for future use, is instead of having all those raw numbers flickering due to rapid, minor changes, is to create averaging routines for each number. That is, you grab a bunch of numbers as they change, for a field, and create a new variable that represents the "average" of a bunch of raw numbers. Then only output, to the LCD, that averaged number. This makes things a lot more stable. I started doing that long ago for any project that has number fields that could have minor changes. Things look much more professional without all that flickering. Hope that helps.

I just started a similar build some days ago using a Pro Mini, ACS712 current sensor and the same OLED. Since I mostly record to my PC anyway my unit is powered using a USB port (thats not the input-port but a dedicated one) which also sends current values to the connected PC for display and recording. I opted to use the internal 1.1V reference instead on VCC, so changes in the PCs supply voltage don't offset the ADC that much. You might want to check this on your build if you connected the battery directly to VCC - afair VCC is used as the default reference for the ADC so your measurements might get skewed with falling battery voltage. Using the 1.1V also allowed me to dynamically scale for

Awesome project!

Great video! BTW, I saw a few videos of people creating an 18650 battery capacity tester, much like what you did here. Looks something you should definitely make! :)

Thanks! Awesome project. :)

Amazing video !

A newer version that would support maybe 50V and 10A would be cool. That would cover not only the current USB standard but also those weird fast charging phones that use 10A.

Think your videos are great and I'd love to see your take on homemade automated blinds. Stay chill

instead of writing it to a file and graphing via excel, i would rather send all data via UDP to influxdb and have real time graph using grafana, apart of this part, awesome video, thanks a ton !!!! Helped me so much

Thanks for this excellent video

How come multimeter refresh rates are so low compared to this? This was cheap and fast, most high end multimeters measure a lot slower than this.

As always that you for you projects.

Thank you for another useful and geat video!

Thank You for this great video :)

I'm building this many thanks for sharing

Great Scott!

Nice project !!

great work man.. thanks alot.

impresses everytime👌

I always love the ideas you bring up on RU-vid and instructables! Rather than buy a power meter, I think I will build based on your design. I can assume you will be publishing another 'ible for this?

Hello, this is a great project, if I use the shunt resistor with a OpAmp, Can I measure the current in micro ampere?

Awesome project ! very coool

Excellent video

great Scott !!!

This one looks interesting , when i finally get off my arse and get some new batteries for my UPS i am so installing this into it :),

You should modify the sketch to create a single CSV file (current, voltage and time separated by comma or semicolon), so you wouldn't have to copy the 3 txt files to Excel, but you could easily open with it, and create diagrams out-of-the-box. :)

Very helpful, thanks.

really brother u r awesome!....😍😍😍

I apreciate all your work! Nice job! (And please make a walkie talkie or an intercom if you can. That is what i need around the house :). )

Thanks for this video

hi GreatScott, i like your videos

nice work bro

super and simple project

Great work

Super video !

very nice.. very informative.

Amazing thinking!! 😇

I love his hand writing

Subbed only because of his great accent!!!

Nice project

Does it enough with power of LiPo battery? Or must be boosted to 5v