36mm Square 12V Digital RGB LED Pixels
(Strand of 20) - WS2801
PRODUCT ID: 683
RGB Pixels are digitally-controllable lights you can set to any color, or animate.
Each metal 'pixel square' contains 4 RGB LEDs and a controller chip soldered to
a PCB. The pixel is then 'flooded' with epoxy to make it water resistant, however
we cannot say 100% waterproof you may need to apply additional epoxy for
some applications/needs/use. These are fairly large pixels but they have a lot of
nice mounting options, such as two metal flanges on the side and a 0.15"/4mm
diameter hole in the middle so you can screw them directly onto a surface.
They're typically used to make outdoor signs. Compared to our other LED dots,
these are much bigger and much brighter, good for larger scale installations.
The pixels are connected by a 4-conductor cable. +12VDC, ground, data and
clock. Data is shifted down from one pixel to the next so that you can easily cut
the strand or attach more onto the end.
Each dot is digitally controlled, with an internal 8-bit PWM LED driver (24-bit
color for 16 million different shades). The pixels must be clocked by a
microcontroller, we have an example code linked below that works on an
Arduino, it should be simple to adapt it to any other microcontroller.
The pixels use 4 x 5050 RGB LEDs, with a 120 degree beam width. All of the
LEDs are controlled at once so you cannot have one pixel with the four LEDs
different colors. (Color control is per single square 4-LED pixel only) The total
max brightness of all LEDs is about 6000mcd. (Please note: mcd ratings of LEDs
are notoriously inflated by most LED sellers, so be extra-skeptical when
reviewing LED ratings!)
Sold by the strand, each strand has 20 pixels in series! Each strand has two JST
SM 3-pin connectors so you can connect multiple strands in a row, as many as
you wish, just watch for how much current they want. The two power wires are
brought out separately to make wiring easier, a 2.1mm terminal block adapter is
handy here to attach a DC power supply. We have a 12V/5A supply that should
be able to drive 2 or more strands (depending on current use). The LEDs are
constant-current driven so you'll have even colors through-out the strand as
long as you have a stable 12V supply
You can drive these with an Arduino using any two microcontroller digital
pins, check this library which also has example code to demonstrate the strands
and be sure to read our very detailed tutorial on usage!
TECHNICAL DETAILS
36mmx36mm squares (1.4") 5mm deep (0.2")
75mm / 3" apart on the strand
20 pieces per strand
These pixels use a WS2801 chip for full 24 bit color, constant-current
drive
12VDC power, 120mA maximum per pixel (LED on full white)
2-pin SPI-like protocol
WS2801 Datasheet for the chip inside each pixel
Brightness per pixel: 6000 mcd combined (we'll try to get a datasheet for
the LEDs)
https://www.adafruit.com/product/683 12‐3‐18
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