FS: 16x16 RGB LED Panels - Page 1
Forum section: electronics / general

author: Sar
author_rank: Contributor
timestamp: October 08, 2013, 02:45:30 pm
content: I'm selling a bunch of LED panels out of digital signage removed from service, sorry this is a long post but I wanted to share as much technical detail as I have at the moment.They're appx 210mm x 210mm (8.25" x 8.24") 16x16 pixel RGB panels with discreet LEDs in good to very good condition with a 12mm pixel spacing driven via shifted-in serial data and use Agilent oval shaped LEDs. The manufacturer stated the brightness at 11,000 cd/m2 and they ARE super bright.Now for thepart.I've gathered as much technical info as I can on these, mostly by tracing out the schematic with a multi-meter and then running them on an Arduino Mega 2560 and researching the data sheets for the components used.Each board has an individual SDI input for Red/Green/Blue and an Output Enable for Red/Green/Blue, a single input for the Clock line and a single input for the Latch. Each board is divided into an upper and lower half, with 4 74HC245 octal bus transceivers used as input and output buffers and 48 MBI5026GF consant current 16-bit LED drivers. 256 pixels, 768 individually addressable LEDs total.Each board has 2 12-pin input headers, and 2 12-pin output headers. The outputs can be connected to the inputs to daisy chain the data through one board, or to multiple boards.Input Header 1 Wiring:1 SDI Red 12 SDI Green 13 SDI Blue 14 Ground5 Clock (up to 25Mhz)6 Ground7 Latch Enable8 LED Output Enable Red 19 LED Output Enable Green 110 LED Output Enable Blue 111 5v+12 5v+Input Header 1 Wiring:1 SDI Red 22 SDI Green 23 SDI Blue 24 Ground5 Clock (up to 25Mhz)6 Ground7 Latch Enable8 LED Output Enable Red 29 LED Output Enable Green 210 LED Output Enable Blue 211 5v+12 5v+Each header controls half of the board. You can tie the OE lines together (Red 1 + Red 2) / (Green 1 + Green 2) / (Blue 1 + Blue 2) and then just run the R2, B2, G2 lines to your micro-controller from the second port.Output header pinouts are the same, except it's all outputs.They will run on an Arduino, you can use PWM on the Output Enable lines to adjust overall brightness.With the 25Mhz clock you can update the boards fast enough to vary the brightness per sub-pixel (r,g,b) to get full 32,000 color displays but you'll need a pretty fast processor and some good programming skill to do this.Required power supply is 5 volts for the leds and 5 volts for the logic chips, they are broken out into separate spade terminals on the circuit board, but can share a power supply at about 7 amps per panel, total.That's really everything I can tell you about these things, anything else you'll need to find out yourself.The manufacturer's logo has been removed from the boards, you'll see the conformal coating removed in that area, they are a small manufacturer selling complete products and have no interesting in supporting these boards in any way.I have them listed on eBay for $34.99US/ea + shipping in the US and $34.99US + any additional shipping anywhere else in the world via eBay's Global Shipping program.http://www.ebay.com/itm/271292699588

author: Sar
author_rank: Contributor
timestamp: October 11, 2013, 01:43:15 am
content: I tried to provide as much usage and tech info as possible, would anything else make these more interesting?

author: iceisfun
author_rank: Regular Contributor
timestamp: October 11, 2013, 06:53:16 am
content: I would buy one @ $25 + shipLet me know