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

In this video I will have a closer look at a custom made LED Matrix that a viewer sent me. I will show you how I reverse engineered the circuit and give you some basic information on how to control the utilized shift registers in order to display letters on the matrix. This step will also include some µC programming! Let's get started!

Thanks to JLCPCB for sponsoring this video

Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod

[rickseiden]

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

[jimmaziashvili]

FULL BRIDGE




Sorry, wrong channel.

[blackturbine]

BREH that mosfet soldering job gave me anxiety

[ayushbansal]

And that's what an electronics enthusiast call a lottery

[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!)

[cxmmax]

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

[enrichment]

Thanks for all the effort you put into these video's man, it's incredibly appreciated by so many of us!

[michaelstark]

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 😁😋

[Ericpwp]

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

[pissmilker]

I want to hear you saying "zentimeter" again

[MatteoDiGaetano]

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

[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

[ivangavran]

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

[drmosfet]

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

[nerdlord]

Your content always impresses! Great video!

[robomaxx]

Scott your video motivates me to study digital electronics.

[Ghostpalace]

I love to see inspiring videos like these!

[HansAndreasR]

@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?

[dharmeshsolanki]

you are really great at explaining circuits 👍👍👍

[grabasandwich]

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