addressing more LED's by switching power polarity?

Using Arduino LEDs and Multiplexing
1

Hello,

So i watched a little thing on Make.com a little while ago about making an LED matrix. I've been looking for the video but can't seem to find it. Either way, i'm looking more for a certain principle or method that they used to address double the leds in their matrix.

They stated that they would hook up a bunch of rows and columns of metal and such to make a normal matrix, although instead of just 1 led at each intersection, they would have 2 leds and then would address one or the other by switching how the power flowed threw the rows and columns.

Is that possible or how would somebody do that?

2

Are you referring to Charlieplexing?

3

YES I AM!
Are there any guides or tutorials that i can look through and maybe try out around?

4

Yeah, there are a number of tutorials on www.instructables.com - Just do a search for Charlieplexing.

Also, here's a short video on Youtube:

5

Thank you so much!
you rock