Scrolling Text + Arduino Tutorial

The LED Matrix:
http://www.futurlec.com/LED/LEDMS88R.shtml

Transistors are standard 2N3904 NPNs

Duration : 0:10:47


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25 thoughts on “Scrolling Text + Arduino Tutorial

  1. That trick with …
    That trick with the? 2×4 matrix of transistors is pretty cool and something I haven’t seen before. It’s pretty amazing to see a single arduino controlling so many leds with no shift registers. Nice job.

  2. @formulaformula1133 …
    @formulaformula1133 shift registers if you want to keep it simple, my way if? you want to look like a badass! haha

  3. I HAZ A CONFUZE!!!! …
    I HAZ A CONFUZE!!!! Seriously though, I’m? glad I don’t have the LED matrix bug.

  4. i made a 6×6 led …
    i made a 6×6 led matrix a while ago and just used 12 transisters to control it. now after watching your video it made me want to try to use less pins. im using 8 pins now and it sorta works. when i try to light up row 3 and column 2 i get 4 leds lit but when i do row 2 column 2 one led lights up i am hoping maybe you can help me? figure out why its doing that. i have made a schematic and the code im using on my arduino mega. just message me your email and ill send both of those to you.

  5. man I had to watch …
    man I had to watch this twice but now I get it! how every came up with this was a? genius!

  6. @ …
    @CompleteAndTotalJunk haha, yea, its mostly ninja! Its just a million loops within a giant loop. nothing else. I’ll? post it sometime to my site

  7. @kdarrah1234 aaaah …
    @kdarrah1234 aaaah missed that part. now i understand. but that means…. whoa how the are programing this? thats a lot of loops! horizontal scanning technique, like a black and white tv? sprite-based scanning for each character? or? is there some library for this? …or is it that you are just a ninja?

  8. @ …
    @CompleteAndTotalJunk well, you couldn’t light both of them at the same time. You would light the first? then the second, in a loop, switching very fast. Thats how the whole thing works. only one at a time

  9. matrix within a …
    matrix within a matrix. confusing and amazing! now i feel ashamed for using a AS1107 to control my single 8×8! despite your generous explanation, i’m still a bit perplexed. looking at your final diagram (07:34), lets say NPNs for anodes are pins 1-6 and cathodes 7-12 and you wanted to light? 1,1 and 8,24. which pins would go high for each? i almost* understand.

  10. @kdarrah1234 3 …
    @kdarrah1234 3 weeks? omg lol i need to get my parts soon for class lol. and also i tried to order some stuff from futurlec, but there seems to be a problem with the site and i can’t order. i think something is wrong with their “order” script, they need better programmers lol. there goes my hopes of cheap leds :(.

    and thanks for the book, i’ll definitely? make sure to check it out, can’t wait to make some real stuff with the arduino, but baby steps first 😀

  11. @lucirz eh, …
    @lucirz eh, futurlec is ok, it takes a while for the stuff to ship… sometimes like 3 weeks! ? the quality isn’t too bad. the best book is probably practical electronics for inventors. read it cover to cover and you’ll be better than me!

  12. @kdarrah1234 thanks …
    @kdarrah1234 thanks alot for the site, futurlec has a really cheap stuff, but are they? reliable? i just wanna get some leds and photocells, i just hope that the cheap price don’t also mean cheap quality.

    also do you have any book or tutorial that you used when you started out that you could recommend for me? i read the “getting started with arduino” but it sucks. i need to learn more about electronics than what’s available on that book, i wanna learn more but not read an advanced book though.

  13. @lucirz check out …
    @lucirz check out my videos on the standalone. it basically just means we breadboard out the vital components needed, oscillator, programmer, etc..?

  14. @kdarrah1234 what …
    @kdarrah1234 what do u mean when u say the arduino is standalone? you’ve built it yourself? or do u mean it comes without usb and etc.? cause i? bought my arduino for 30$ 🙁

  15. @lucirz I got most …
    @lucirz I got most of it from futurlec, the? arduino is standalone, so that’s only like 5 bucks. The breadboard is actually pretty expensive. I put that whole thing on 1 dollar proto board, so yea, around 20 bucks, maybe less

  16. @kdarrah1234 so all …
    @kdarrah1234 so all those? wires, the breabeard, and the leds cost less than 20$? where u buy it from?

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