Multiplex Demonstration

This video basically just demonstrates the concept of multiplexing, and shows how the appearance of multiplexing works by varying the refresh rate.
http://www.kevindarrah.com/

Category:

Science & Technology

Tags:

• how
• to
• multiplex
• refresh
• rate
• arduino
• pic
• avr
• microcontroller

[KSITREVS]

Hello there, I ordered a couple of led matrix's just to play around with them, do you think you could recommend a suitable transistor to use? Thank you very much. (to use with anode and cathode) :) Thank you for the great video!

[kdarrah1234]

@KSITREVS yea, check out my video on the scrolling display, i usually use 2n3904s

[crudvelch]

well, I didn't know that Bill Clinton was into multiplexing :))) great vid!

[kdarrah1234]

@crudvelch hahaha! thanks!

[ekrano]

Thanks. I have been studying Computing and recently covered Multiplexing, this was very helpful.

[kdarrah1234]

@ekrano glad it helped!!

[Glisevask]

I'd never heard about multiplexing before, but i always wanted to know how those LED displays actually worked, and you made it so simple even i could understand the concept. Thank you!

[KSITREVS]

@kdarrah1234 Hahaa isn't that strange! I already ordered them a couple of weeks ago and there the same ones! Work like a treat! Ordered 45 ;) because I will use them as general transistors as well! I will now be using a controller with SPI i think I will keep you posted! Thanks again Trevor Boultwood

[sonus89]

You're a nice person! Your explanations are clear and understandable! Which was you school?

[mrP1n34PPL3]

your camera doesn't keep up with the refresh rate :D

[marcemmers]

Me again, i watched your vid another time, and i did make a thinking mistake. Without multiplexing you need 8 outputs for 8 leds plus 4 for the Commen Anode's (so not Common Cathode). While using multiplexing you would come to a total of 6 outputs for the transistors and 4 for the CA. Still, if you are controlling the leds seperatly, you said 7 outputs for 7 segment led, you can still turn on a segment instead of only one led at a time.