What I did on my summer vacation,

(Daniel Garcia) #1

What I did on my summer vacation, aka - How I drove 2640 leds off of a single digix (12 lines of 120 LEDs each and 12 lines of 100 leds). (This was the controller for Locus).

The breadboard has 4 74HCT245’s, used for level shifting the digix’s 3.3v signals to 5 - each cat 5 cable carried data for four strips.

Power was run completely separately.

(Daniel Garcia) #2

This was also the project that finally sold me on the necessity for the level shifters for ws2812b’s

(Mark Kriegsman) #3

Ooh ooh post the link to the video…

(Daniel Garcia) #4

This one? https://www.flickr.com/photos/technorainbows/14612360024/

(Mark Kriegsman) #5

That’s the very one. :slight_smile:

(Justin Eastman) #6

So what necessitated the need for the level shifters? The distance between the chip and the first LED perhaps?

(Daniel Garcia) #7

No - 3.3v signals and chips wanting 5v signals. Even with short wires I found it to be a crap shoot. There’s a number of articles out there on the need for level shifters with 2812 and friends.