Super Low Electrical Energy Meter || DIY or Buy || Is measuring µA/nA possible the DIY way?

24. 01. 2021
115 341 zhlédnutí

You can buy the Otii Arc here: www.qoitech.com/buy/
Thanks to QOITECH for sponsoring this video.
Previous video: csworld.info/mem/video/a5aCnKKamXqpi4s.html
HACKED!: Speaker System gets an IR Remote video: csworld.info/mem/video/i7iOaGGb0XaoZoc.html
Make your own Power Meter/Logger video: csworld.info/mem/video/n9Wqn6acsGZ7aak.html
Electronic Basics #27: ADC (Analog to Digital Converter) video: csworld.info/mem/video/eNGboo2ux2ZxZak.html
Facebook: facebook.com/greatscottlab
Twitter: twitter.com/GreatScottLab
Support me for more videos: www.patreon.com/GreatScott?ty=h
In this episode of DIY or Buy we will be having a closer look at the Otii Arc product. It is a tool that can basically measure µA/nA and therefore calculate the used energy of a low power device. Since such a tool is super handy to have around, I will also try to create my own crude low energy meter in this video. Let's find out whether a Teensy microcontroller and an Op-Amp circuit is capable of measuring µA/nA! Let's get started!
Websites which were shown/used in the video:
hackaday.com/2017/12/22/coin-cells-the-mythical-milliamp-hour/
www.pjrc.com/store/teensy32.html
forum.pjrc.com/threads/25532-ADC-library-update-now-with-support-for-Teensy-3-1
github.com/GadgetReboot/Processing/tree/master/Simple_Scope
www.analog.com/media/en/technical-documentation/data-sheets/OP177.pdf
www.analog.com/media/en/technical-documentation/data-sheets/AD7192.pdf
ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11057-32-bit-Cortex-M3-Microcontroller-SAM3X-SAM3A_Datasheet.pdf
Music:
2011 Lookalike by Bartlebeats
0:00 Introduction (Why I need to measure µA/nA)
1:45 Presenting the Buy option (Otii Arc)
2:53 Intro
3:12 Testing the Otii Arc
7:01 Coming up with a DIY solution
8:44 Building the DIY circuit
11:12 Conclusion

Komentáře
  • Just a quick information because viewers seems to feel like Buy won because the product was sponsored. That was not the case. When I do such sponsored videos I always make sure that I am allowed to say and show whatever I want. I tried lots of different designs for my DIY attempt but all of them were fails. For the video I picked out the most interesting DIY circuit. For me DIY was simply not the winner of this episode. So please stop saying that the outcome was influenced by the sponsor or that I did not try hard enough for the DIY circuit. Lots of stuff goes on behind the scenes of such a video production that does not make it in the final video. Thanks for reading this :-) Stay creative!

    GreatScott!GreatScott!Před 2 měsíci
    • Try Marco Reps diy super low noise circuit

      Andrei CioraAndrei CioraPřed měsícem
    • the honest thing to do is not to put yourself into a position of a conflict of interest to begin with. you can say it won't sway your opinion all you want, the incentives still line up otherwise. If you want to review a sponsored product, just review a sponsored product, but this to me seems dishonest, no matter what you promise. It'll influence your opinion no matter what you intend

      Dumb GuyDumb GuyPřed 2 měsíci
    • I need some body to teach me hardware, please

      samba yessa suwarehsamba yessa suwarehPřed 2 měsíci
    • Well let's see some video;s in which you don't go for the sponsored product and prove to us. Quite lately it feels like everything on youtube is sponsored by. Starting to loose interest in it now, I watch these video's because i can't afford the fancy gizmo's that keep been given away, I get more please doing a diy make do project.

      Lee JonesLee JonesPřed 2 měsíci
    • @GreatScott! Make "Air Charger" same as launched by Xiaomi

      Manish ChauhanManish ChauhanPřed 2 měsíci
  • Hello! Nice video as always, but this time it is not that real what you said. You can read nA, Ua and MA valuse with ultra cheap circuit such as the "microcurrent" presented by EEVblog;) I think you should check it out!

    AT LabAT LabPřed 23 dny
  • Do a servo motor diy or buy, that is an interesting question can we make it more precise with a PID algorithm?

    Nikola StoimenovNikola StoimenovPřed měsícem
  • Wouldn't that be cool to have a diy or buy episode about a home thermostat. I would really like to know if I'd be better buying a new one or build one myself!

    SimoneSimonePřed měsícem
  • For real man with your great presentation and knowledge… If you started making more test equipment and metrology videos… Your viewership would explode! Something like Marco reps does with his channel.

    HULL GUITARS USAHULL GUITARS USAPřed měsícem
    • @GreatScott! it might not bring in the massive amount of viewers you are used to but it will definitely appeal to a different type of viewer. Metrology nerds are pretty abundant on CSworld

      HULL GUITARS USAHULL GUITARS USAPřed měsícem
    • Doubt

      GreatScott!GreatScott!Před měsícem
  • Any chance that changing the shunt resistor on an INA21x like the one in your previous energy meter could do something useable ?

    Ping PhotoPing PhotoPřed měsícem
  • Du kannst mit nem Digitalvoltmeter geringe Ströme messen. Diese Dinger haben meist nen Innenwiderstand von 10 MOhm und mit ein bisschen Ohm'sches Gesetz kann man auf den fließenden Strom schließen. Ich habe so mal ne Röhre ausgemessen. Auf meiner Arbeit wird damit sogar ein Leckstrom von ein paar µA oder gar nA gemessen (bei einer Spannung von rund 1 kV). Sie funktioniert aber nur mit einem kalibrierten Messgerät.

    CryptonNite23CryptonNite23Před měsícem
  • There are tricks you can use to make an electrometer (a current meter for values less then a microamp). For a start you need a jfet input op=amp and you need to make it using "dead-bug" wiring techniques. That way you can get down to fA if you cool it down to -40C. I'm in the process of designing one of these for a DIY mass spectrometer right now. The LMC6041 is not perfect but if you want a FSD of 1pA it's easily good enough. The other point is to "spoof" it by using it as a split supply op-amp. IE design the circuit so it uses -3.3V for the ground rail and +3.3V for the positive rail. Also drift and offset can be dealt with not at the input (that would mess with the characteristics) but on the output between this stage and the next. One further point is do not use any kind of cleaner that leaves a residue or touch any of the components as that will leave conduction pathways that will drive you nuts trying to find and sort out.

    Gordon LawrenceGordon LawrencePřed 2 měsíci
  • Micro usb. Wow im surprised many still used micro usb where most manufacturer switched to type c

    MUHAMAD IRFAANMUHAMAD IRFAANPřed 2 měsíci
  • You should try the INA212 for the amplification it is designed for measuring low currents

    Richard Van RijnRichard Van RijnPřed 2 měsíci
  • You are on the right way to develop it , go on.

    Mohamed HanonMohamed HanonPřed 2 měsíci
  • Hi, for microcontroller I use MSP430 series by Texas Instruments (MSP-EXP430FR6989), and for current shunt sensor INA186. A greeting

    Atose_OffLineAtose_OffLinePřed 2 měsíci
  • 3:50 man you're too modest 😁👍

    Haydar HannachiHaydar HannachiPřed 2 měsíci
  • @10:59 What is this software?

    Aarni TakalaAarni TakalaPřed 2 měsíci
  • The most important point being dynamic range and u could try to implement a range selector by sensing the voltage change and then a suitable sense resistor. Trying to measure uA with a 6 ohm resistor no matter how many op amp stages u use is not the correct way. U need a range selector. The whole design is described in joulescope. This design is probably also the commercial product in ur video is using.

    ravi tezaravi tezaPřed 2 měsíci
  • The Nordic power profiler kit 2 (PPK2) is much cheaper at around $90 USD, and is also accurate down to the uA range with auto ranging. You would need a carrier board to operate it though. The Nordic PCA10040 will do the job and is also around $40 USD, so for around $130 USD you get a very similar functionality. The only downside is that you don't get a fancy enclosure... I have absolutely no affiliation with Nordic, but have used this at work and it did the job very well and with minimal setup effort.

    Michael AssoulineMichael AssoulinePřed 2 měsíci
  • Make "air charger" same as launched by Xiaomi.

    Manish ChauhanManish ChauhanPřed 2 měsíci
  • i see a lot of comments about uCurrent..the problem (as i understand) is that it cannot switch from low currents to high current for example when you go from deep sleep to WiFi..thats why there is currentRanger which is uCurrent updated..more in Andreas Spiess episode 245

    Easy NowEasy NowPřed 2 měsíci
  • please can you help a noob, can somebody tell me if i can wire a 3 pole relay as a single pole, i think thats what i want/need?, i needed a relay to turn on and off from - 24vac,on the coil side-, 240v 35a on the main load , and with out spending silly money i could only find a 3 pole one cheap, thats 35 amps , all i need it to do is when activated by the 24v ac , allow the current of my 240v ac to pass to make the circuit, and that can be just the live or the live and neutral, etc etc if it can be done?, would wiring it so my live splits and goes in to all 3 poles and then out all 3 poles(when activated), to give more current, as its for my mig welder ,(24v trigger), so more amps the better, thank you

    lazy carperlazy carperPřed 2 měsíci
  • Grape!

    ahsan iahsan iPřed 2 měsíci
  • Is it just me or does he have a fixed breathing sound in between sentences? I might need to do this for my videos... Must be for a reason? :)

    Projects with RedProjects with RedPřed 2 měsíci
    • Update: After some research, there is indeed a such thing, where breathing between sentences is important, noted!

      Projects with RedProjects with RedPřed 2 měsíci
  • Good video. Replace your coin cell with a good lithium-Ion battery.

    RepairmanRepairmanPřed 2 měsíci
  • Yes sir, it is not all that easy to get down to nA ! Component placement, thermally-generated voltages, ambient noise sources, drift and offset... I did manage to measure, with relatively good accuracy, 5uA current on a Rohde & Schwarz RTO oscilloscope, but that is a LOT more than €600 ;-) however, it might be possible for a smart guy like the Great Scott to use the principles to get close. But, instrumentation amplifier is a good start, and/or chopper-stabiilised opamp... If one refers to the ancient gurus of analog electronics, like Jim Williams, Robert Please, there are some pretty good "pointers" there. Gutes neues!

    Lohi KarhuLohi KarhuPřed 2 měsíci
  • I rather buy 100 coin cells that spend 700€ fore a super low power meter lol

    Electro jessyElectro jessyPřed 2 měsíci
  • Could you make a video about the new Raspberry Pi Pico?

    zingnikozingnikoPřed 2 měsíci
  • The nose you measure is the ADC noise from your ARM 12 bit ADC! It has no external reference pin on board. The ARM Cortex-X Microcontrollers have awful ADC. Only stand-alone ADC able to get rid of processor's noise. Plus a reference voltage for ARM ADC is a 3.3voltage of its power supply. Any decent op-amp with JFET inputs is able to amplify microamps. Wrap it in copper foil, connect to ground reference, give it a precision reference voltage and it will do the job perfectly fine.

    NEVER EVERNEVER EVERPřed 2 měsíci
  • Amazing

    BKMAXI TECH ODIABKMAXI TECH ODIAPřed 2 měsíci
  • but can the QOITECH run doom that's the main question

    FBI-ChanFBI-ChanPřed 2 měsíci
  • Great scott u r not great becoz u buying all not Doing your self 👍

    ikku PKDikku PKDPřed 2 měsíci
  • DIY is good option

    ikku PKDikku PKDPřed 2 měsíci
  • Great video!

    CarlosCarlosPřed 2 měsíci
  • Hello, can you make a video about grounding schemes in an off-grid solar panel installation?

    Anôn ImoAnôn ImoPřed 2 měsíci
  • There must be a very very old solution for this. Have we considered what our grandpa’s engineered?

    Ken MasonKen MasonPřed 2 měsíci
  • How do you make a relay switch that gets triggered by voltage less than 1v?

    Stephen ChenStephen ChenPřed 2 měsíci
  • I haven't reach the conclusion, but I bet it will be that we should use the commercial solution if we need higher precision.

    Javier AlvarezJavier AlvarezPřed 2 měsíci
  • I can buy a lot of batteries for the price of that meter.

    PyroRob69PyroRob69Před 2 měsíci
  • How about magnetic force feedback actuator for flight simulator, diy or buy

    ady Nameady NamePřed 2 měsíci
  • And what about old analog DC ampermeter like this www.ebay.fr/itm/DC-Minus-Zero-Plus-50uA-50uA-Analog-85C1-Analogue-Ammeter-AMP-Panel-meter/183884691307 ?

    Trent LaneTrent LanePřed 2 měsíci
  • +GreatScott! DIY or Buy: Mark Rober's Creative Engineering course? I hear you commented on this but I don't see your Tweet anymore...

    Davinder ChandhokDavinder ChandhokPřed 2 měsíci
  • I built my own remote as well (a few years back) and I OR'd the 4 buttons into another digital pin using diodes. This allowed me to wake the microprocessor on the press of _any_ button rather than just one of them. A neat trick that might be useful to you next time :)

    Pete MundyPete MundyPřed 2 měsíci
  • Great video!

    The RintincolaThe RintincolaPřed 2 měsíci
  • lately all your "diy" vs "buy" tend to go towards the "buy" :( but I like your channel for all the "diy" projects.

    Rafal KiermaczRafal KiermaczPřed 2 měsíci
    • A lot of the buy is sponsored, of course he's going go towards the buy. It's starting to loose my appetite to watching these videos.

      Lee JonesLee JonesPřed 2 měsíci
  • I want to know if you can read milli Amps with a DIY version using Arduino, or it is too slow?

    gabriel daigabriel daiPřed 2 měsíci
  • What about I/V converter? That can give You much higher resistance, so also amplification.

    DamjesDamjesPřed 2 měsíci
  • Purchasing a 24-bit sigma delta ADC chip is very easy. But making it spit out clean 24-bit is extremely difficult. If we have 3.3V and 24-bit resolution, each bit is equivalent to 196 nano-volts. At such lower voltage, my town radio station signal will have higher effect on the ADC. So PCB layout becomes extremely difficult.

    Debraj DebDebraj DebPřed 2 měsíci
  • Have you considered using an already available ultra low noise and analog to digital converter combo such as the HX711 usually used in combination with strain gages for measuring weights? I might recall seeing you using one of those in this channel. It is basically an instrumental amplifier combined to a 24 bit ADC. I'd recommend that before jumping to conclusions. You might get interesting results ( maybe not, idk :D). I personally used it in a few projects and just remembered how stupid sensitive it was. Of course it will get a lot of noise too but for just a couple bucks, might be interesting a try. See ya

    theanalcolicotheanalcolicoPřed 2 měsíci
    • Tried it. Did not deliver decent results.

      GreatScott!GreatScott!Před 2 měsíci
  • lol "tinkerer" more like complete n00bs XD

    plageranplageranPřed 2 měsíci
  • It should test the battery and the lowest current that works for both

    thetommantomthetommantomPřed 2 měsíci
  • 3:27 Why not USB Type C, for that money you get micro??....nooo!

    SJ PretoriusSJ PretoriusPřed 2 měsíci
  • 1:06 AmpereSTUNDEN. You forgot the STUNDEN man🤣

    Daniel HermesDaniel HermesPřed 2 měsíci
  • Not really EEVBlog ucurrent device is good enough for the job.

    Ku MuKu MuPřed 2 měsíci
  • Micro USB on a $600 tool... Ouch! At least go for good 'ol reliable USB Type-B (square one) if you're not going to pony up the licencing fees for Type-C.

    Charlie MioCharlie MioPřed 2 měsíci
  • Sadly, this was promoted, so of course BUY would win. And it did.

    gabsrgabsrPřed 2 měsíci
    • @GreatScott! I really wanted you to do like the other non sponsored videos, using a lot more of components and trying it with different methods. Idk what happened here.

      gabsrgabsrPřed 2 měsíci
    • Bullshit

      GreatScott!GreatScott!Před 2 měsíci
  • Yes. Look at the eevBlog uCurrent or LowPowerLab CurrentRanger.

    Tim DriedgerTim DriedgerPřed 2 měsíci
    • I agree, The guy with the Swiss accent, Andreas Spiess, did a comparison video of these two on Dec 8, 2018

      Phil BolducPhil BolducPřed 2 měsíci
  • Hi. For very low current a good option is to go for a logarithmic amplifier. Make sure to choose a op amp with a bias current in the pA range (€€€). Cheers

    Alexandre CorreiaAlexandre CorreiaPřed 2 měsíci
  • ADC 24 bit (16777216) = 5v / 24bit = 0.288 uV. 3.3v / 24bit = 0.1967 uV. a resistor of 1 ohm.

    jacobhn2jacobhn2Před 2 měsíci
  • make a video using raspberry pi pico board

    ASTRON ROBOTICSASTRON ROBOTICSPřed 2 měsíci
  • Pretty easy to measure pico-amp currents with a transimpedance amplifier as used in most photo-diode amplifiers. Much harder to then use the same amplifier to measure mili-amps. A log amplifier chip is a good compromise here. Forgot the part number, but it easily measured from about 10pA to 5mA. That said, an LM662 and a 10Gohm feedback resistor will let you measure 60fA currents :D

    Marty lawsonMarty lawsonPřed 2 měsíci
  • Has nobody ever comented to you that the English language also has a word 'the' its not all 'thee' or like that - there is a simple rule when each is used - or is this just your individual style you promote?

    usertogousertogoPřed 2 měsíci
  • Make a super high voltage volt meter, which can measure upto 100KV

    Unknown PersonUnknown PersonPřed 2 měsíci
  • Hi Scott, I had the same problem to measure the current during deep sleep on PIC. Looking for in internet I found a very cheap solution to measure nA current (teorically pA). Take a look at : www.vk2zay.net/article/251 and www.kerrywong.com/2013/01/17/current-adapter-for-low-current-measurement-using-ts1001/. What do you think?

    Luca MoreschiLuca MoreschiPřed 2 měsíci
  • Ever thought of making a diy usb flash drive?...am pretty sure all it needs is a flash chip and usb controller chip

    Malvodore JebediahMalvodore JebediahPřed 2 měsíci
  • I suppose you can use current mirror and try to charge up a capacitor of known value, measuring time interval with high speed microcontroller. But this current mirror can eat more current than you are trying to measure) Great videos you have here, btw!

    Amon-RaAmon-RaPřed 2 měsíci
  • Please make a studio microphone using 32mm capsule and jfets♥️♥️♥️♥️♥️

    Roshan DevRoshan DevPřed 2 měsíci
  • But the real answer is... What about the three coin cell? Do you have an answer to explain this strange behavior?

    Nicoló PozzatoNicoló PozzatoPřed 2 měsíci
  • For the DIY/simplistic quality evaluation I would say the capacitor based method is the easiest way to validate at the nA/uA range (actually in the capacitor method we don't measure current, but in this problem you're not interested in the current but the energy). Prudent selection and identification of the characteristics of the test setup can product relatively useful results. Certainly it tells you about the 10k pullup that should have been 100k !

    Michael LeeMichael LeePřed 2 měsíci
  • There is a heck of a lot more to the OTII than measuring low currents (accurately and repeatably)! I bought 1 for home and two for the office where we also have the $35k N6705 from Agilent. I love the OTII, i just works and I know the results will be right unlike any homebrew solution. I've recommended it to a ton of friends and colleagues.

    Ingmar MIngmar MPřed 2 měsíci
  • Hmm! I'd love to see you revisit this with PCBs from our favorite supplier, possibly using some of the ED tricks the commercial product did (massive holes or slots for isolation etc). There has to be a way to make the output less noisy without breaking the bank? Of course the PCB is gonna take some time to design and route but it's not that big of an investment? Our favorite PCB supplier drove the cost "down down down" :-)

    The CheatermanThe CheatermanPřed 2 měsíci
  • Have you heard about the Power Profiler Kit II? It does basically the same but for less money.

    BerntBerntPřed 2 měsíci
  • Burr Brown OPA 128/129 -> have fun measuring down to fA....

    Cara CarcassCara CarcassPřed 2 měsíci
  • @GreatScott! Can u please update on your arduino drone project??

    LMAO Good OneLMAO Good OnePřed 2 měsíci
  • How would you design a solution that would scale to measure voltage and current of hundreds of battery cells in a large battery? Would you use CAN bus to reduce the cabling?

    Systems PlanetSystems PlanetPřed 2 měsíci
  • @GreatScott! I think you can squeeze out quite a bit more energy from that cell if you use a 'vampire circuit' or Joule Thief. I think that circuit was first coined by 'bigclivedotcom'. It basically boosts the voltage of the cell to the desired voltage and keeps doing that until the cell is completely drained. (The cell voltage will drop over time and at a certain moment, the uC simply wont turn on anymore, even though the cell still has some juice left in it.) Would probably make an interesting video on its own! Cheers en keep up the good work!

    Jonathan OveresJonathan OveresPřed 2 měsíci
  • 1:06 You're missing an h behind the A.

    PseudynomPseudynomPřed 2 měsíci
    • 1.true 2.good eyes

      Lucifer's InfernoLucifer's InfernoPřed 2 měsíci
  • Great Scott I felt that I am missing your projects these days like peltier fridge, Bluetooth speaker, portable monitor and stuff you did in the past

    Sandeep SSandeep SPřed 2 měsíci
  • And why not measure u-current with higher value resistor like 1kOHm for example? Then you have one 1mV for every one uA.

    Lolu9okaLolu9okaPřed 2 měsíci
    • If you draw a mA, the voltage would drop by a Volt. And then the MCU stops working due to undervoltage

      LoTR BuildersLoTR BuildersPřed 2 měsíci
  • you have almost 1.5milion sorry i`m from germany

    the unnamed playertwopointzerothe unnamed playertwopointzeroPřed 2 měsíci
  • 2 thoughts: 1) There's a good piece of software, called SerialPlot, which in this case of 'graphing' is a bit easier to use. 2) With the mentioned shunt resistor measuring, you forgot to mention that there's a voltage drop on the resistor, which will result (assuming a fixed supply voltage) a 'voltage drop' on the measured device' supply. So this way, the supply voltage of the device can vary based on the current flow, which can lead to even operation fails (by alternating the actual supply voltage) if the current is high enough.

    Doe JohnDoe JohnPřed 2 měsíci
  • 1:09 to be precise it should be 0.21Ah * 3V, not Amps times Volts which is Watts not Watt-hours :) units, units :)

    SzymekCRXSzymekCRXPřed 2 měsíci
    • Correct👍

      GreatScott!GreatScott!Před 2 měsíci
  • But what about that remote. Why did it use 2 batteries already?

    wiki1887wiki1887Před 2 měsíci
  • I think ultra low current needs bigger shunt, not 6 Om, but 6 kOm instead.

    ТимофейТимофейPřed 2 měsíci
  • Generally speaking I am not too fond about "DIY or BUY" that are sponsored by the maker of the "BUY" solution. Even if I believe that everything that was said was true, the neutrality seems tainted. And where is the mentioning of EEVblog's MicroCurrent or how it is called?

    SchwuuuuupSchwuuuuupPřed 2 měsíci
  • can u plz work on raspberry pi pico can u make an rtc clock with alarms on a raspberry pi pico please please please please please please please please please

    Harsimran singh BawaHarsimran singh BawaPřed 2 měsíci
  • I've been using a few of these for work and I can vouch that they are extremely reliable and useful tools. Using them in conjunction with their serial function (as well as ability to use external serial devices) makes them excellent for recording events and their power draw on wireless devices. Pricey yes, but their value is incredible.

    James RuleJames RulePřed 2 měsíci
  • I once watched a movie about designing low battery consumption circuits, and the circuit itself was powered by a capacitor while sending the signal, and the capacitors were charged with low current between signal transmissions. This resulted in the battery being discharged with low current.

    VoltZero83VoltZero83Před 2 měsíci
  • There are ICs for instrumentation amplifiers that can do what you needed, but they do not use op amps for the initial stages and finding a supplier for hobby level customers is going to be difficult. Op amps, even the low noise ones, have inherent noise and distortion issues, especially when running in a range that is near their physical limits. The physical chips are not as accurate as the spec sheets or math would have you believe. This was a topic covered in my industrial instrumentation training and my classes on electronic communication as it related to industrial applications. Yes, op amps are cheap and easy to set up, but they are not the best solution for every application and are often used in applications they are simply incapable of working in, like this. I think you should revisit this project because an ultra low power meter would be very useful and the price that company is charging is a serious rip off, even though they clearly had a good electrical engineer spend a few months on the project, but the hardware on that board is not expensive silicon.

    KnightsWithoutATableKnightsWithoutATablePřed 2 měsíci
  • Awesome 🔥

    DEX TEXDEX TEXPřed 2 měsíci
  • Its possible, I don't think the OP117 was the best choice for that, Personally I would've used some low noise, ultra high impedance input JFET amplifiers (LF356 - www.ti.com/lit/ds/symlink/lf356.pdf). Maybe consider looking at EEVBlog's uCurrent or MarcoReps ultra low voltage measurement videos. Another note is that you had poor construction, low noise electronics should be put in a metal enclosure for shielding and (optimally) temperature isolated/controlled (which is what I believe the holes in the Otii Arc were for, if they wanted electrical noise separation they would've been better off using via holes).

    linuxguy 11linuxguy 11Před 2 měsíci
  • Wouldn't the DIY solution here just be to buy a purpose built differential ADC IC like the AD7193 and measure across a current shunt? You can get a few nA resolution with a basic breakout and a 1 ohm resistor for like $15 USD.

    Peter .S.Peter .S.Před 2 měsíci
  • Hey Buddy, please make a video on electroplating the copper pcb board to create conductive layer on vias and through hole.

    Abiramm BrAbiramm BrPřed 2 měsíci
  • Increasing performance to simple PCB board to high level PCB board.. excellent bro.. keep it up ... Explaining best💖👍👍

    Mohammad Irsad AliMohammad Irsad AliPřed 2 měsíci
  • You are very intellegent

    Javier's DIYJavier's DIYPřed 2 měsíci
  • What about using Dave Jones micro current?

    DelleniteDellenitePřed 2 měsíci
  • 4:28 why does the button cell say WEEE.

    FBIFBIPřed 2 měsíci
    • It is a Waste disposal regulatory authority.

      Electronic HaircutElectronic HaircutPřed 2 měsíci
  • for last few weeks i was in search of such tool, uCurrent and Current Ranger has lots of limitations, if you google on it you will find lots of people discussing different issues. but its true product like OTII priced too high, buying such option does not make sense as well.

    SairfanSairfanPřed 2 měsíci
  • I think the Nordic Power Profiler Kit II for under 100€ would be a better alternative for buy.

    Jonas MeyerJonas MeyerPřed 2 měsíci
  • Your idea to come up with a diy solution for µA / nA measurements sounds pretty cool. I think that a low pass filter in the op amp feedback path would have made a significant difference in signal quality.

    Sören EngelmannSören EngelmannPřed 2 měsíci
  • The market is getting flooded with these "zero-drift high precision" amplifiers suited for power monitoring in IoT devices, perhaps revisit with a part like the TSZ121 from STMicro?

    TheCreeperkillerTheCreeperkillerPřed 2 měsíci
  • So close to 1.5k , keep going, great Scott

    Infinite HunterInfinite HunterPřed 2 měsíci
  • Yay new awesome video

    Infinite HunterInfinite HunterPřed 2 měsíci
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