Controlling a BIG LED Matrix?! How Shift Registers work! || EB#39

[@Tuetuopay]

Cool video! Though, as some people pointed out, some LEDs around the letters still look like they're on. This is called ghosting. In a nutshell, when switching to the next multiplexing line, there is still a bit of energy left in the LEDs, that do not turn off immediately, thus creating the effect of a ghost line below or above the intended line. What you need is a tiny delay between the turn on times of each of the four rows: turn on line 0, wait, turn off line 0, wait, turn on line 1, wait, turn off line 1, wait, ... The waiting times are depended on what are your LEDs, as well as what are the drivers you are using, so to remove this effect, best is trial and error to find the proper value. Hope this is useful (and that you or anybody learnt something from this comment!)

[@rickseiden1]

It looked like there were some LEDs that were on, and didn't turn off as part of the sliding lettering. What caused that?

[@elninorosario]

Exactly what i wanted to comment

[@greatscottlab]

I think some shift registers got damaged during the video.

[@kyoudaiken]

@@greatscottlab Probably happened when you were testing it carelessly with voltage. :/

[@4DRC_]

@@greatscottlab easy enough fix! Worth it for the education gained I'd get skinnier probes, these banana plug hybrid looking things are kinds fat and it looks like you grazed/shorted some chips while probing

[@NourMuhammad]

It depends on the propagation delays of the signals coming from the controllers. The row and the column scan signals must be precisely synchronized with each other otherwise, you might see ghosting effects. or might be he destroyed some inputs when he was examing the circuit! which by the way was a very primitive way to test such a circuit!

[@jimmaziashvili8533]

FULL BRIDGE RECTIF..... Sorry, wrong channel.

[@SAHILGAMING-uy5ij]

Electroboom

[@nein_3371]

:D

[@kabelloseskabel7029]

Same😂

[@Jeakerek]

Only Sechspuls-Brückenschaltung here

[@LiezerZero]

And I'll see you Next Time.

[@blackturbine]

BREH that mosfet soldering job gave me anxiety

[@kwekker]

yes me too, I wanted to go there and slap scott in the face

[@mgfails9274]

It's working? It's working. It doesn't matter

[@UnknownIdentityDE]

Anyone here who didn't kill a mosfet yet? 😉

[@jacesullivan4563]

😂😂😂

[@SuchetanSaravanan]

😂😂 lol

[@cxmmax4265]

this viewers was very helpful and generous. isnt it ? thanks to him (and you by the way)

[@ayushbansal3140]

And that's what an electronics enthusiast call a lottery

[@Xilog]

I now want to break into GreatScott's house

[@nickstanley5064]

@@Xilog ,nar. I would rather break into The Signal Path's lab. I mean have you seen that guy's lab?

[@ManofCulture]

@@nickstanley5064 Hell yeah, his lab is a gold mine.

[@akarshagarwal4516]

@@ManofCulture Why has everyone forgotten EEVBLOGs lab

[@ManofCulture]

@@akarshagarwal4516 Oh yes, and Mr Carlson's Lab too

[@metamud8686]

"Led's get started"

[@MrKoval-nm9ky]

bought a PCB in JLCPCB and they gave me a discount for transport, and even the boards, so it become very cheap, instead of 20€ I paid 3€ for transport and more 2€ for 10pcbs! Thanks

[@MFT9170]

Well, the digital technology is abstract for me. I 've had troubles to understand registers, but when I see you can rewire these bugs and control them by buttons... Just note that the video is highly appreciated.

[@greatscottlab]

Thanks for the feedback. Glad you liked it.

[@AmusementLabs]

For an electronics nerd like myself that is by far the BESt gift anyone could get me (that and filament). It's just good ole' resources for the imagination to run wild. Especially the 2 big motors, what to do with those! :D

[@ivangavran412]

This is so great i am going too school right now and just learning about registers and its awesome to see there use in every day life

[@TheAdventureLog]

Gamning To Have Fun haha but this isn’t everyday life.

[@drmosfet]

This episode was just to shifty for me, but yet very illuminating.

[@donovanelliott9060]

lmao

[@michaelstark8756]

I almost died when I saw that video 😂😂😂 I work for the company who produced that PCB 😂😂😂 That some LEDs are constantly on is because of one defect LED. After they brake these LEDs are not open, they produce a short circuit so the other lines are also powered when they shouldn't be... It would be interesting how you got those PCBs 😁😋

[@martinrocket1436]

Michael Stark, where can I get one of these PCBs?

[@michaelstark8756]

@@martinrocket1436 Hey Martin, sorry but they aren't made for the free market. We developed them for a businesspartner...

[@martinrocket1436]

Michael Stark, and the business partner isn't selling them either? 😢

[@michaelstark8756]

@@martinrocket1436 I'm sorry but they use them in their own products and sell them. But you get six of them with a power supply and a microcontroller for, I think, 1500€ 😁

[@devicemodder]

you got a model number for those that i can punch into ebay?

[@NNNILabs]

If you'll take a bit of soft constructive criticism, I enjoyed this video more than the previous three. But then again, I like the previous three because of the excellent production quality ;)

[@valentinreynes9287]

You should try to find a small software called "Matrix to led". It allow you to draw your word or drawing on a grid that you set the same size as your Matrix. Then with one mouse click it displays you the binary and hex equivalent of your drawing. It is much faster than typing all the 0 and 1 manualy . Great video though

[@wchen2340]

im working on something like that. streaming to and from my led matrix as well as interfacing it with a pygame-gui and clickable rectangular led-representations. not ready yet but maybe next month....

[@Ericpwp]

Your timing is impeccable! I was just working with shift registers.

[@grabasandwich]

I wish I was this smart AND good at putting my mind to things.

[@setrik_az363]

I feel dumb after watching this and understanding nothing

[@senceryazici]

People in the comments like commented 17 seconds after the video is published, these guys like you Scott !!

[@iProgramInCpp]

Damn you should use bytes (which have 8 bits inside of course) instead of booleans, since booleans take 1 byte even though they can only store 2 values...

[@remcovhardeveld]

That depends on the compiler you use. I have used compilers that were "smart" and would assign a bit of a byte to a boolean. So if you had 8 booleans you only used 1 byte and not 8 bytes.

[@Joe-xr2xl]

Hell, another thing you can do is use ints, and using the bitwise operations, and use it to store each line. Nintendo if i remember correctly used bytes to store each 2x4 segment of a the nintendo symbol to check gameboy compatibility. Yeah, thats what nintendo does. catskull.net/gameboy-boot-screen-logo.html

[@iProgramInCpp]

@@Basement-Science For the puny ATmega328p you'd *definitely* want memory over price! It only has a measly 2k of RAM, that's why. If you really wanted to use booleans (as that's easier to program), then you'd be much better off storing the boolean array in PROGMEM.

[@iProgramInCpp]

That's *exactly* what I was talking about.

[@iProgramInCpp]

Yes. But you really should be careful about RAM usage as 2KB isn't much at all.

[@robomaxx8719]

Scott your video motivates me to study digital electronics.

[@darrendackly4754]

You make it sound so logical and easy to follow. Unfortunately my barely adequate brain can't keep up and now my head hurts.

[@bansheedearg]

Next project please: Persistence of vision displays, say a line of LEDs on a bicycle wheel, they have to be very fast to work properly. The opportunities for polar mathematics and your budding animation skills speak for themselves.

[@romeucapelasa]

i woud love to see an oled 4k tv diy vs buy with this leds XD

[@jyotigvzsftiwari221]

its true great scott and electronoobs are really best friends..

[@yxcvbnmmnbvcxy544]

You can drive Shift Registers on SPI, so 8Mhz data rate on a nano

[@samsami9014]

Great video... i hope you can make a video about battery desulfator

[@HansAndreasR1]

@GreatScott!! i have seen a matrix made out of "normal" light bulbs showing scenes from movies... it was very beautiful and wanted to recreate that ever since with ...small bike lights or something... did you ever come across a project like that or would know how to start on it?

[@achyuthan90]

Alright! Time to use this LED matrix in your intro video clip!

[@NekitGeek]

Intro clip with desoldering leds from matrix)))

[@MarcelRobitaille]

Pro tip: Instead of writing a two dimensional array of bools you cans just write an array of numbers in this format: 0b01010101.... Then, you can easily get the bit out using a bitwise and. This will save you a lot of horizontal space in your code.

[@TheJay6621]

So.. I was going through DMD library by Freetronics, for arduino and P10 led module .. and GreatScott uploads a video on DMD as well. Thanks Bro.

[@HoYuanHou]

Good Job, I like the course Digital Design in colleage. we design digital clock with software only but your video explaind everything.

[@jobbe-wijnen]

I have learned a lot about Electronics lately but this sure is the point where i Say: No I won't go there 😂

[@kpieceemmry3387]

You are supposed to a written document of all the theory 😅explained in your video so that one can just enter your site to do self study and grab it better. Thanks for taking your time to pour much information ℹ️

[@nand2624]

I wonder why there aren't even a single active noise cancellation projects, even though you Google it like crazy

[@greatscottlab]

I can put it on my to do list

[@adkodiyan]

GreatScott! Awesome!

[@KingJellyfishII]

?

[@noudlindeman1931]

I thought electroboom made a video but I’m not sure

[@KingJellyfishII]

@@noudlindeman1931 Yes I think you're correct

[@MatteoDiGaetano]

We need part two of this video ;) Awesome work as always!

[@billgrabbe9992]

Are those Dupont connectors that you are using? That might make a good subject for a video. In fact, it would be great to get an overview of different connection methods with advantages and disadvantages.

[@_GummyBear_]

i really love your projects but the most i really like is your voice and that accent :D

[@ExploringNew1]

9:32 is it enable or unable?

[@triplexSch]

Do you have a video on how to find ICs for the job? I always end up building a lot of extra circuit when in reality I could often use a simple and cheap IC which would make my projects a lot easier....

[@drawapretzel6003]

Knowing me, id probably spend 40 hours coding a table for every letter and character, then call that table to display on the LED's any string i want, then add in graphics like moving left right, or up down, and then at the end just make it say butts.

[@chituleaflaviu495]

Only true geniuses are left-handed!! I’m also a lefty)

[@johanneskling2734]

You should try out Atom to Programm an arduino...i think its a very practical way because you have much advantages and it’s more fun

[@lsudan2670]

i allways loved playing with those tiny LEDs 😍😘

[@akshaydasm.k9388]

I'm currently working on a project like this, the only difference is that i'm making a 16*32 matrix using the ic max7219.

[@dmkays]

You had the matrix upside down. You want to scroll left to right.pretty awesome gift if you ask me.

[@purge98]

Thanks. I like your Australian accent.

[@anandhakrishnant6788]

Great video!! Scottt

[@zerog2000]

ahh memories of digital logic class ;) (Going to get Captain DeMorgan's shakes in a bit ;)

[@sefalibhakat143]

Hey,Great scott why you are not making on "how to make an stick welding machine with adjustable amps using IGBTs as switchs"? or a DIY OR BUY on stick welding machine.

[@LiezerZero]

Congrats on 1M Subs.

[@greatscottlab]

Thanks :-)

[@manojbr439]

Greatscott please make vedio on designing a automatic gain control audio amplifier. I know the working principle, but just need a practical design. I have some design ideas but I don't have an oscilloscope to test that, hope you can build one.

[@Doile911]

I can't believe my luck!! I needed knowledge about shift registers yesterday! and i got it today! dayum. ps.: Thanks btw!

[@greatscottlab]

You're welcome :-)

[@dharmeshsolanki4354]

you are really great at explaining circuits 👍👍👍

[@karenma7704]

At 5:20, your inverter is drawn at the wrong place in the D-type flip flop. The inverter should be in the top row!

[@projects4996]

Congr8z for 1M subs GreatScott 👍👍☺️☺️💐💐💐💐🎂🎂

[@jc-zh9kl]

that was awesome! we just need to figure out how to make it work with e1.31 and xlights.😁

[@jingarjay8754]

Wow, jlc PCB is even open during Chinese new year?I know the workers pain...

[@adamsucksatyt]

I got a 45x8 matrix from the scrapper, and I tested all the LEDs. They were all good, and this matrix would be useful as a KZbin subscriber counter, and weather data display. I need help with the multiplexing, and at the end, I need help with the code for the Arduino.

[@SaurabhGangamwar]

Thank you. Please make video on how you learn new things... Thanks

[@satishsaroj3335]

Lot's of work behind every..... Video... Such a great source knowledge... I also interested to do such projects. But don't know how to start...?

[@tamer27antepli]

Make a display with individual addressable led led strips

[@elluisito000]

That example is cool 😎

[@stephennetter1423]

Gotta run GREAT SCOTT across the LED Matrix... use for new intro??

[@DJkillstyler]

Yo GreatScott, i have some ideas for projects you can try/create to make a new video :D 1. a mobile car heating for the driver area and windows 2. a present card, and if you open it will play your music 3. a little spy cam with memory for videos Hope this are good concept s for you ;p

[@skaltura]

just today i saw a advertising billboard which was an screen, and i thought, one could "cheaply" do muuuuuch larger led matrix than an actual huge monitor.

[@ahmedelectricianofiraq5550]

Excellent video scott .

[@greatscottlab]

Thanks

[@carlotheatheist]

Mr great Scott. Is that for your 1 million subscribe celebration? Congrats for 1million plus subscriber again! 🙂

[@Napert]

learned about plexers, multiplexers, registers, coders, decoders, etc. at school got an E or D watched this video holy shit it's starting to make sense and i actually remember this stuff try to re-take can't because 2 weeks has passed why didn't you upload this earlier?

[@greatscottlab]

Sorry to hear that

[@bobi_lopataru]

The D flip flop has 4 NAND gates? Um, wasn't it 2 XOR and 2 AND gates? That's how I knew it worked! (D flip flop is a more advanced version of an enable controlled RS NOR latch right?)

[@bhosaleprathamesh4557]

Pls do something on CNC machine with steppers pls ...... Nice explanation by the way.... Love from india

[@Ghostpalace]

I love to see inspiring videos like these!

[@ziobit5177]

in my opinion this could work with only 3 shift registers, 2 for columns and 1 for rows, if I'm wrong correct me, furthermore I assume that the circuit absorbs a maximum of 1 column, effect of continuous scanning

[@blubb7711]

Manchmal wunderts mich wie du in einer Woche ein Video schaffst. Alleine das Basteln würde beim Durchschnittsbastler schon 2-4 Wochen dauern.

[@TheIceLeopard]

What about a RGB LED Matrix?

[@DarshanKumar-mo4ew]

Already did

[@whythosenames]

You call that thing monitor

[@noudlindeman1931]

Just the same but triple the IC’s

[@ventusprime]

what kind digital or normal =4 pinned ??

[@ventusprime]

digital like ws2812

[@spoderman15]

POWER ON ALLLL THE LEDS!!!

[@bouhannacheabdallah]

in that case can we do a small display with a big collection of LEDs ,???in the same way you did this one???

[@Theoriginal3DPlayground]

Could you please make a Video about „Anti-spark circuits“ to prevent sparking at connecting high voltages such as charging battery packs.

[@acenio654]

Yes, controlling the Matrix

[@euvo_sound]

I like those tons of leds

[@tanusreedas3608]

he is better than bookish iitans

[@pikaonyoutube2139]

I'd like some of those led matrix panels

[@novetkavin6608]

Hey Scott can you do a video about Voltage spikes in Transformers? And how to stop them. Please do that for me...

[@omaribrahim5008]

just a capistir and modified square wave or pure sine wave or spwm NOT normal pwm

[@praveenelumalai7624]

Please make a basics video about rfids and nfc

[@PlasmaHarsh]

Greatest scott.......

[@nerdlord20]

Your content always impresses! Great video!

[@nielsdaemen]

You should have used the hardware SPI output of the atmega328p instead of bitbanging!

[@VoidHalo]

Julian Ilett made a few great videos about shift registers annd linear feedback shift registers. I'd suggest anyone wanting more to check them out. Has some real easy to follow breadboard examples with 74hc595s.

[@r3bers]

JLCPCB was closed this Chinese new year. I put order before. And it stuck for week in progress.

[@wolvenar]

Jlcpcb were saying that theywere not going to be open on the Chinese New year... They must have decided against that?

[@zineddinenezzal8952]

Can you make a video explaining RFID and RFID module and how to use it with arduino please

[@sujasanthosh3252]

At the end, I felt like that there will be continuation of this video next week 😀

[@greatscottlab]

Not really. Sorry.

[@santoshgurral66]

For a sipo shift register why the clock is common to all d-flip flops ? Shouldn't the clock signal be cascaded from 1st flipflop to 2nd to 3rd and so on...then only we can say bits are shifting one after other. If clock pos edge reaches all d-flip flops at same time output of all flip flops change at a time instead of shifting one after other ? Please clarify

[@AlbySilly]

I'm actually thinking of making an led matrix for a cosplay

[@AdityaKumar-nj3bf]

Can you make a tutorial video on Bluetooth controlled rgb matrix with many effects.Please...... I am from India and ofcource your big fan by heart.....Thanks.

[@leonc.k]

Dear greatscott What do think about a collaboration with marco reps (who also does electronic videos), joergsprave or electroboom? And what are your thoughts about the enigma machine (from and electro-mechanical viewpoint, not historical)?

[@julian4035]

Did you see this dots in the matrix while running?

[@TheRainHarvester]

The weird thing is that most shift registers seem to be more expensive than an Arduino nano! So when building my own, why use a shift register? Crazy.

[@houseofelectronics5869]

Lol I get about 10 shift registers at the price of a Nano.

[@TheRainHarvester]

Cool! What brand? I looked at max32 and some microchip , ti, and they were expensive. I'd love a part# if it's not too much trouble. How much are they?

[@houseofelectronics5869]

You can google Sn74hc164 for instance. I don't know where you live , but it costs about half a dollar where I live

[@houseofelectronics5869]

Yeah , they are pretty cheap everywhere barring a few specific models

[@spicybaguette7706]

just buy them on aliexpress.com

[@mathiasbackof4993]

Our german ingineer is back with another awseome Video!

[@Venvon000]

Why are some LED's lit up constantly? Aren't they powered by the output of the IC?