16x16 WS2811 LED Panels

[EkriirkE PersonaLED LEDSuit]

So I have a stock of 8...

I've been wearing them a few times, Burning Man included.  They are bright and beautiful!

I'm powering them by single-cell LiPo packs.  Yes, 3.7ish volts.  Controlled by a 3.3V ATMega w/ LDO regulator & C code I wrote myself to transform, pan, & scan bitmaps spanning multiple panels into the zigzag addressing scheme, AVR assembly for WS2811 timings/driver included.

The edges are sharp, corners should be trimmed.  It is a pretty solid substrate, double sided copper barely etched away.  They don't breathe at all and I get sweaty underneath them - and I'm not a sweat-er.

When paneling them for a larger display the space on the edges is too great for a seamless presentation, you do need to trim them.  The provided wires and solder job are also bulky.  I suggest maybe using flat wire (copper foil strips?) to bring the connections to the underside.

When strapped to my chest they aren't prone to much flexing so I'm happy with these as such.  However after one night at the burn they started intermittently working, getting noisy then stopped.  The problem was the trace from the input signal has cracked, so I just made a small jumper from the pad to the Data In of the first LED.

When you flex them they always make a disturbing crackling sound.  I don't trust them for repeated flexing.  "Set it and forget it"

Attached is a mockup of the panel wiring.  Its from memory I could have the + plane detail slightly off...

-Erik

[Phil Spitler]

This looks cool, do you have any video of it in action?

How big is each panel?

Cheers. 

Phil 

Phil Spitler  |  Creative Technologist   |  Bonfire Labs  |  t : 415.394.8200  m : 415.571.3139

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<WS2811Panel.png>

[snikta...@gmail.com]

On Thursday, October 3, 2013 2:28:37 AM UTC+2, EkriirkE PersonaLED LEDSuit wrote:

When paneling them for a larger display the space on the edges is too great for a seamless presentation, you do need to trim them.  The provided wires and solder job are also bulky.  I suggest maybe using flat wire (copper foil strips?) to bring the connections to the underside.

Poking around the inimitable Mr Wu's Alibaba site, I came across these:

http://www.aliexpress.com/store/product/P20mm-WS2812-LED-digital-flexible-panel-light-8-16pixels-size-16cm-32cm-DC5V-input/701799_1085573230.html

8 x 16 pixels is 16cm * 32cm, so the spacing is double what you get on those panels you have, but if you look at the pictures they seem to be made to "jigsaw puzzle" into each other on all four sides to combine into bigger panels. Interestingly they're $100/256 pixels (2 panels) rather than the $65/256 pixels (one panel) of the denser ones. Maybe the copper's the most expensive part :-P.

Cheers, Robert.

[EkriirkE PersonaLED LEDSuit]

Update, I wore these to Treasure Island music fest '13 (Robert! Where were you this year???)  Add one of the panels broke, a trace on the data line cracked.  There was no excessive flexing, just strapped to someone's chest..  I repaired it by soldering a tiny jumper from the DO of one to the DI of the other.

I must emphasize "set it and forget it".

[EkriirkE PersonaLED LEDSuit]

They are 15.5mm+2 LED area, 17+2 as advertised panel, 6.25mm & 6.15mm x  alternating pitch.  The columns are not precisely aligned there is a slight hint of pairing - sets of two are slightly discernible.

Here was my very first test run: https://www.youtube.com/watch?v=gfrGbHAfMTk.  a 64x128 image of SpongeBob scrolling about.

[Robert Atkins]

On Tuesday, November 12, 2013 7:39:34 AM UTC+1, EkriirkE PersonaLED LEDSuit wrote:

Update, I wore these to Treasure Island music fest '13 (Robert! Where were you this year???)  Add one of the panels broke, a

Ha! Amsterdam I'm afraid :-)

 

trace on the data line cracked.  There was no excessive flexing, just strapped to someone's chest..  I repaired it by soldering a tiny jumper from the DO of one to the DI of the other.

I must emphasize "set it and forget it".

Interesting. I just got the 2cm pitch panels I mentioned upthread. I'll give them a bit of a flex in a YouTube vid. I don't think you'd want to sit on them, but they seem to have a bit of give.

Cheers, Robert.

[Andrew Morrow]

Where did you get the panel itself?  I like it!