Make your own LED Battery Level Indicator

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More project information (schematic, parts list, pictures,.....) on Instructables: www.instructables.com/id/Make...
Parts list (incomplete, see Instructables for more, affiliate links):
Aliexpress:
2x LM324: s.click.aliexpress.com/e/_d8E...
6x 10k Trimmer: s.click.aliexpress.com/e/_dTF...
6x 2k Resistor: s.click.aliexpress.com/e/_dTP...
6x 5mm LED: s.click.aliexpress.com/e/_dV6...
1x Boost Converter: s.click.aliexpress.com/e/_d8E...
Ebay:
2x LM324: rover.ebay.com/rover/1/711-532...
6x 10k Trimmer: rover.ebay.com/rover/1/711-532...
6x 2k Resistor: rover.ebay.com/rover/1/711-532...
6x 5mm LED: rover.ebay.com/rover/1/711-532...
1x Boost Converter: rover.ebay.com/rover/1/711-532...
In this video I will show you how we can use the classic LM3914 IC to create an LED Battery Level Indicator. Along the way I will show you how the IC works and explain why it is not the most precise circuit for a Li-Ion battery pack. And at the end I will show you how I created my own, more precise Battery Level Indicator circuit with a couple of simple components.
Websites mentioned in the video:
www.powerstream.com/p/INR1865...
www.akkuteile.de/
lygte-info.dk/review/batteries...
www.akkuteile.de/lithium-ione...
Thanks to JLCPCB for sponsoring this video
Visit jlcpcb.com to get professional PCBs for low prices
Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod
(incompetech.com)

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Опубликовано:

7 июл 2018

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Комментарии : 565

@mynewschannel3100 6 лет назад

Brilliant! A project using a couple of IC's and not an Arduino or Raspberry Pi in sight, what a breath of fresh air :)

@mynewschannel3100 2 года назад

@Petronilo You missed the point, NO PROGRAMMING is required!

@MrJason005 6 лет назад

i'm not a big fan of promotions or adverts, but i want to thank you for putting something relevant (jlcpcb) instead of something completely unrelated (like lootcrate or something)

@camilomason4560 5 лет назад

l o o t c r a t e

@skoke8944 4 года назад

@@camilomason4560 is shit

@varunsreedharan5347 3 года назад

raid shadow legends

@euvo_sound 3 года назад

@@varunsreedharan5347 is more than a piece of crap lmao

@MrAnonymous878 5 лет назад

i honestly have no idea half the things you said in your videos but it stills captivate me every single time

@blaketurner9389 Год назад

Even the GreatScott archive still has huge value today. Thank you for all your time and effort!

@drubradley8821 6 лет назад

Over the past 4 to 6 years of watching your channel, I have seen many of your neat projects, but this one, is really well explained, and thought out. Thank you

@electronicstuff6355 4 года назад

Man, I just love this channel. It's so educational and provides hours of entertainment. Keep it going GREAT Scott!!!

@CARMATE1XXX 4 года назад

This video really saved a lot of my time. I made that LM324 battery indicator for my little Li-Ions, working Great.

@Stefano91ste 6 лет назад

I have created many beautiful circuits with LM3914 and LM3915 =) I love these ICs!!!

@Drxxx 6 лет назад

Electronics Projects - Stefano91ste me to

@daanb7894 6 лет назад

I just searched how to do this about 3 hours ago and now you upload a video on it. Crazy coincidence.

@shifter65 5 лет назад

Every time I click one of your videos I find myself still watching hours later =P Thanks for the great content!

@thejadecox 3 года назад

Hf man hurt free

@RobertKramer17 2 года назад

Same!

@Lammy2k Год назад

The quality of your channel is unmatched. Awesome!

@vladhristov2316 5 лет назад

Dude, I am amazed by your skills. It is just unbelievable, at least in my world.

@petermuller5031 6 лет назад

Thanks for the video! I‘ve built a similar battery level indicator for my lead acid battery a while back. Of course, if I draw a lot of power, the voltage collapses (even though the battery is still charged) and the battery level doesn‘t show the charging state correctly anymore. You have to keep that in mind, but since LiPos are offen built for high current demands, the problem shouldn‘t be as big.

@y2ksw1 6 лет назад

It's quite a good project an I never thought about making my own IC clone. I have solved similar problems with a high quality frequency generator and a microprocessor, for detecting the actual charge, which is total overdoing. Well done, my friend!

@lillydoye7418 6 лет назад

Well this was well timed, I was reaserching this chip last night.

@machine2747 6 лет назад

The LM3914 is an interesting chip. We used to make crude oscilloscopes combining a LM3914 and a 4017 decade counter /decoder. Thanks for another great video!

@greatscottlab 6 лет назад

You're welcome :-)

@lochinvar00465 5 лет назад

The LM324/4017 O-Scope would make an ideal project. Would probably include 4011's or 4093's for trigger control and time base.

@TheIceLeopard 6 лет назад

I waited for this video a VERY long time. Thanks Scott! Been a subscriber for about 5-6 years now, if I can remember correctly.

@greatscottlab 6 лет назад

Thanks for watching :-)

@TheIceLeopard 6 лет назад

Thanks for being the RU-vidr you are. Btw got a quote I think you might like. I think you said you were self-taught to program the Arduino so I believe you did this: "Code to learn. Not learn to code."

@isoProxanol 6 лет назад

--> Learning by doing ^-^

@JanCiger 6 лет назад

StormyIceLeopard please, if you need a battery indicator like this, a much simpler solution is to either use one of the specialized "fuel gauge" ICs that are designed for this job or use any small microcontroller that has an ADC. Then make a lookup table to compensate for the nonlinear discharge curve. A much easier, more compact and a lot more robust solution than having to tweak 6 pots (and making sure they don't drift or move!). I like GreatScott's videos but some of these constructions are best kept only as educational experiments and not really deployed as a practical solution.

@keithking1985 4 года назад

@@TheIceLeopard that makes sense and is a cool saying.

@edindelic4841 6 лет назад

Deine Videos sind echt gut gemacht und super informativ! Weiter so @GreatScott!

@iamzainshahbaz 4 года назад

I just like his video no matter what... this guy is a legend

@aniketakabir1572 6 лет назад

Nice video as usual. Very informative. Keep up the good work

@AthanCondax 6 лет назад

I have been watching your videos religiously for over a year and a half. I have not learned a single thing. I will still watch your videos because they are great. I truly suck at electronics and have not gotten anything to work as I truly don’t understand how it works.

@oskarpolanski3152 6 лет назад

Finally!Thank you for this video.Loved it!👍

@MCsCreations 6 лет назад

Awesome work, dude! Really nice! 😀

@Musicpins 5 лет назад

This is some cool stuff, thanks for sharing :)

@zaprodk 6 лет назад

Just a tip, a dash "-" in a model number is just that - a dash, not a minus. I get super confused when you say minus.

@bgarv7 6 лет назад

a dash is *

@ko-Daegu 6 лет назад

Brandon Garven Wait what ?? Why Dash - Multiply *

@n3ttx580 6 лет назад

. dot , comma - dash * asterisk / forward slash + plus

@GRBtutorials 6 лет назад

Yes, the DVD Forum would get angry if you call DVD-R DVD minus R.

@crystallineblaze 5 лет назад

Technically a dash is longer. A single '-' is called a hyphen. A dash is often made up of two hyphens unless the font you're using supports a true dash like an em-dash (-). But most people call them dashes anyway, including me :D

@KerbalLauncher 6 лет назад

That's a nice 2.5bit flash ADC you got there.

@CST1992 4 года назад

I was just changing batteries today in my wall clock and I thought it'd be cool to have something that just takes in a couple of AA cells and lets me know how much juice is left in them(for testing my remaining stash of batteries). Boom! Here it is!

@nickush7512 3 года назад

Great work dude.

@KhalilEstell 6 лет назад

My favorite chip!! The bar graph ic! That was the first chip I used to make a pcb and the one that made me understand how analog circuits work.

@subirdas8009 4 года назад

Sir your voice and explanations are very nice......

@BenMitro 6 лет назад

Great Scott! Thanks for explaining what is required. Doesn't an arduino have AtoD that could be used measure volts with the discharge profile in rom? Load could then be incorporated into the result with multiple profiles per battery based on current of battery. This could then be used to detect charge/discharge modes and show the actual state of charge under all conditions. That would give you a universal battery state indicator. Could extend it to measure individual state of charge per cell through switching the cells into the AtoD. Using leds for level is a great idea, 10 leds make a lot of sense intuitively, though 4 is probably adequate. What am I saying? You've essentially given me another project to do....one day! Cheers, and thanks again for your fantastic video series - I enjoy them immensely.

@ddavity 5 лет назад

You're a master, sir

@ryccoh 6 лет назад

It's crazy how they stuff all these components in that little chip package

@vinnysworkshop 14 дней назад

Well, this is one of the less dense chips in that regard. A 6502 processor from 1975 has many times more transistors and resistors on a die area not much larger. AND IT'S FROM 1975!

@-_IT_- 6 лет назад

Could you not have made one with one RGB LED and change the color based on the power level?

@greatscottlab 6 лет назад

Possible

@bairfamilyfarm1336 6 лет назад

You'd have to choose 3 voltage points and hook up each to one of the 3 colors. I currently can't think of a way to make a combination color of rgb while still being able to choose r,g,or b by itself. Maybe through the use of diodes to prevent two or 3 pins from being permanently connected?

@ABID5 6 лет назад

there is a prob, some people are colour blind

@bacphan7582 6 лет назад

or you can use a cheap ass Attiny 13 and some coding, damn, uC is so cheap now

@bobs12andahalf2 6 лет назад

That would be cool

@hase-ge1dn 6 лет назад

Mal wieder ein sehr gutes Video du hast immer sehr guten Kontent mach weiter so👍

@Pokornz 6 лет назад

Nice project! Just want to point out that the discharge curve changes dramatically depending on the current draw, but perhaps you used the curve that will suit the draw of your specific project. :)

@IIIIII705 6 лет назад

Great video scott!👍😁

@cashel1111 6 лет назад

great video :) been waiting a while for this one

@tuanpham-bb1ly 4 года назад

Nice project

@RDarrylR 6 лет назад

Another interesting project! Thanks

@gammalikker 6 лет назад

posted 15hours ago... what?

@SUNILKUMAR-ku6wj 6 лет назад

i was waiting for this video thankyou.

@Braindead_Ace 5 лет назад

Constant current output 🙏🙏 it's so beautiful

@T-C-M 5 лет назад

Great video and explanation 👍

@alinbostan4569 6 лет назад

Awesome project !!!!

@michaelgasperik4319 5 лет назад

I always like your videos!

@gmplascencia 4 года назад

Great video brother!

@elonmuskmtmt886 5 лет назад

SO surprised that you don't have 1M subscribers yet. Your videos are awsome!

@vinnysworkshop 14 дней назад

Well, it's 2024 and GreatScott has roughly the same subscriber count as @TechnologyConnections . Also known as rougly 2 million for both, although the difference is roughly 320,000 subscribers. Or 1/10 of @williamosman . Roughly.

@Jones12ax7 6 лет назад

Very nice approach, using the old and good analog way. I made myself a flashlight using an Arduino Pro Mini to control the power led with an external Mosfet and LC filter for PWM. It worked as a charm, and for battery capacity I measure the voltage with Arduino and made the flashlight to blink from 0 to 9 in morse code.

@greatscottlab 6 лет назад

Good idea

@Markle2k 6 лет назад

It's not bad if you are using alkaline primary cells. But with Li-ion cells under high loads there isn't much voltage differential between 80 and 20 percent unless you have a large amount in series.

@bobs12andahalf2 6 лет назад

Very interested in the intricacies of charging li-ion battery packs. I see a lot of conflicting information about BMS boards - mostly about whether they're actually effective. Could you do a video on that, maybe test and review some boards for, say, 3s or 4s?

@soumyaranjanmaharana2538 6 лет назад

Good job man

@Creativecreator 6 лет назад

Great Vid !!

@_pawan 6 лет назад

whatever you said and did was just AMAZING, even though i didn't understand what's exactly is going on...😂😂

@electronic7979 6 лет назад

Excellent

@LorenzoBravi 6 лет назад

In this method, you're not consider voltage drop of internal resistance. State of charge value may have different terminal voltage according this relation: V=Voc-R*I, (V=terminal voltage; Voc=Open circuits voltage, R=internal resistance). Two simple method for SOC estimator are: 1) Coulomb counting: integration of current in time. 2) Soc(voc): inversion of R-C battery's model.

@ExplosionCrafter 6 лет назад

But he can also just use his indicator circuit while the main load is turned off. So V = Voc

@Markle2k 6 лет назад

Open circuit voltage isn't very useful, Gordon. Li-ion cells, particularly tired ones, will experience quite a bit of rebound after a surprisingly short period of time. You can have a battery that is effectively dead and sagging down below 2.7v that rebounds above 3.2v before you can get your multimeter leads on it. Lygte-info.dk (where GreatScott! got his battery curves from) has an article on this.

@ExplosionCrafter 6 лет назад

That's true. I assumed a situation were he used a quadcopter for instance and immediately measures the remaining capacity after usage

@rianmatos8354 6 лет назад

Best channel, i'm brazilian

@kjamison5951 6 лет назад

That’s beautifully precise! Nice job!

@SuperUniverse31 6 лет назад

YEEEEEES FINALLYYYYY THANK YOU CARBON UNIT

@andreaswolfesberger6140 6 лет назад

Nice Video, thank you.

@themineofglitches8567 5 лет назад

Perfect bro you are a real creator 😜😝

@jimjohnson3207 6 лет назад

I absolutely loved this video, it was perfect and beautiful. There is nothing wrong with it, i actually have no complaints. But I have one complaint, the LEDs weren't RGB. It would have been cooler if all LEDs were on and they were all green if the battery is full, and the colour slowly changes to red and less LEDs get put on as the battery is closer to death.

@binerdevr1544 6 лет назад

Very nice video I like ur video 👍

@Nebechadnezzar0311 6 лет назад

that was awesome!

@MedSou 6 лет назад

Thank you 👍👍👍👍👍

@Mr.Unacceptable 6 лет назад

You can find the LM3914 in old electronics that have indicator lights for the control buttons. Most things that have the play rewind eject or record or dials that light up.

@vinnysworkshop 14 дней назад

It's also likely used for the VU meters in old cassette decks, though I'm not completely sure on this one.

@hobbyelectronics2121 6 лет назад

very informative.

@tchiwam 5 лет назад

Did mine with LM339. Because they were in the bin next to me :D

@lexus4tw 6 лет назад

I using a microcontroller, ADC and lookup table, I also massure the current flow and calculate the total consumption, it's easier and more accurate

@hippopothomas1980 6 лет назад

LOVE IT!

@easyelectronics4364 6 лет назад

Woww you are great great scottt!!!!!

@Imchen414 5 лет назад

You are Genius

@sumanrath8497 6 лет назад

nice video thanks✌😘👍

@lucastella8591 6 лет назад

+GreatScott! What program do you use to design your circuits? Thank you.

@rich1051414 5 лет назад

This could be done with a single op amp, LED's, resistors, and nothing else, exploiting the voltage drop across the LED's. Add a bridge rectifier and a capacitor to smooth out the flickering and you can measure AC with the same circuit(Like audio). The only down side would be the LED's fade gradually instead of giving harsh steps, but I think that is a good thing. The non-inverting input of the opamp is connected to the battery, the inverting input is a voltage divided output to set the gain(the gain depends on how many volts it takes to overcome all of the LED's forward voltage at the batteries max voltage), and each LED is hooked in series, each with their own resistor to ground. The resistors to ground could be set as to produce a non-linear behavior of the LED intensity as well, to account for the non-linear discharge curve of the battery.

@MyOwntuahur 6 лет назад

Thanks a lot

@somyadwivedi5965 5 лет назад

Sir, I am a hobbyist in electronics and surprisingly I am 13 years old. From 3 years I am watching your videos and they are literally awesome but slowly the topics are getting boring. So, I am requesting you to make an interesting video. And ya! I am from India. Thank you Your Genuine Viewer

@ientuchonguoimoibatau2653 4 года назад

Great, thanks you

@Suvicharjunction07 6 лет назад

very nice video bro i like ur videos love u tc

@nodirbekchoriev1763 6 лет назад

Thank you

@VoidHalo 5 лет назад

So it's a flash ADC but without the logic to convert the output to binary. I made one of these from op amps as one of my first IC projects. I connectected the input to the capacitor through a buffer on a 555 in astable mode. Didn't think to use it as a battery tester. Maybe as a VU meter. The lm3914 definitely makes for a much smaller circuit than having 4 or 5 dual op amps connected to a ladder resistor network.

@eatdrinkwineguy 5 лет назад

Cool video! Really like this project. What about doing something like this with a VU indicator for a DIY audio system or similar??

@emilgiza8519 6 лет назад

Yeyyyy! New video!

@iontesu2911 6 лет назад

Another possibility is to still use the TI part, reduce the number of LED indicators from 10 to, say 6, and use certain LED to display the voltages that you chose on your design. You can also set a min voltage set point as another degree of freedom. No need for so many pots.

@diygeorge4761 6 лет назад

You don't need a boost converter! Instead use a reference voltage ic or zener reference, that is lower than the lowest battery voltage. The best approach is to go with TL431 Precision Programmable Reference which will give you 2.5 Volts (Adjustable). Then divide the input voltage using a resistor divider so that it is lower than the 2.5 when the battery is full. You can use one of the LM324 op-amps as a buffer.

@lochinvar00465 5 лет назад

LM324 already has a voltage reference built in.

@Bylga 6 лет назад

Thanks for sharing =D

@theairaccumulator7144 6 лет назад

So very interesting.

@harsimaransingh3059 3 года назад

Hi Scott great Video, I m new to electronics what is that plastic matrix where u solder chips is it pcb? U also show it opening intro of your videos where leds are stacked and then light to great Scott

@electronicseternity9210 3 года назад

Hi Scott., thank you for the great video. This chip can only be used to indicate if battery charging is completed based on signal, Rhi and Rlo. However, without the charging power, can we use the power from battery alone to indicate its voltage level whether it is full or close to being depleted.

@diptajitdutta9369 6 лет назад

Doing a great job scott. BTW Which one is the best in features and has more functions among this Metrahit pro multi meters m242a, m242d, m242e or m253a?

@cle3995 6 лет назад

Why don't you use a simple linear regulator to get the constant voltage for the circuit and devide the battery voltage with two resistors? That way you could get rid of the boost converter.

@greatscottlab 6 лет назад

Good idea

@TheWP 6 лет назад

Yes.

@loisminato2767 6 лет назад

Make a video about this ! Thankss

@revimfadli4666 6 лет назад

Cle mens efficiency?

@TheWP 6 лет назад

Boost converter would be less efficient than a voltage regulator

@dagoston737 6 лет назад

Nice one :) How about a video about USB Oscilloscopes? Would be happy to see a proper video about them, if they worth even considering them, and if so, which one to go :) Thanks :)

@PhG1961 6 лет назад

Wonderfull entertainment and indeed I learned something.

@electronicstuff6355 4 года назад

I learned so much from this one video. You should do some math videos.

@rudolfvanloggerenberg1816 2 года назад

great video thanks, what size fuse did you use and what is the spec on the black capacitor and the red component pls?

@bkj242 5 лет назад

Great video most informative. Are you offering any DIY kits for 3s, 4s and 5s 18650 Cells. The ones I am finding today are either plagued with issues or simply do not work consistently as offered. Thanks!!

@shaileshshukla3610 6 лет назад

Definitely again a good project... But I just wanted to know whether it would take care of voltage regulation due to different loads..? And how does a battery indicator works in mobiles as it always shows battery in percentage very precisely that too acurate.... And voltage regulation due to load also doesn't affect it....

@instorm6661 6 лет назад

I use a 14s battery in my ebike, the problem I have with charge indicators is that when my battery is full it is at ~58v and I like the lowest point to be ~51V (at this point there is very litle charge left and starts to get dangerous to over discharge since you draw high current out of it so it is needed to be on the safe side), but when the battery is at about 53 or 54v and you would accelerate hard, the voltage would drop to 51 or less. So even at full chage if you accelerate hard, the meter would say "low charge" an you can't get an accurate battery level. I tried making a level with a arduino and a display, but even if I "smooth" the reading when you accelerate hard you get a high to nothing read all the time. Ideias are gladly accepted :)

@RCP-1136 6 лет назад

Great stuff but this will not work with high current applications since the voltage of Lithium batteries sag quiet a bit under load (depending on current draw). Love your channel btw;)

@simstud 6 лет назад

Seems like a lot of work, space, complexity, and money for something a tiny mcu (like the attiny85) could do. It's the digital age, man!

@Zhaymoor 6 лет назад

thank you great episode , but how do you know about existence of such ICs ?

@brzydka_i_bestia 6 лет назад

Nice, but using arduino seems a little bit simpler, even if more expensive. Also it is worth having a switch/button in the circuit to avoid constant current draw by the display, and having it lit briefly just to check.