RGB Pixels are digitally-controllable lights you can set to any color, or animate. Each pixel contains an RGB LED and a controller chip molded into a ‘dot’ of silicone, with flanges so they can be pushed into holes in thin sheet material. The dots are waterproof and rugged — they’re typically used to make outdoor signs.
12mm RGB pixels come in two different shapes: “bullet” (thin) and “square” (flat). Both use the same type of LED, driver chip and data protocols…the main difference is how they can be mounted: bullets fit better into narrow spaces, while squares are better suited to shallow spaces.
Both types use an 8mm diffused RGB LED (“12mm” refers to the size of the mounting hole for installation) — diffused pixels mix colors nicer. At 5 volts, they draw a maximum of 60 milliamps per pixel: 20 mA each for red, green and blue.
The LED pixels are spaced along a strand of ribbon cable, with about 3 inches (75mm) between pixels. If additional distance is needed you can cut the ribbon cable and solder 4 wires to extend the gap to the desired length.
Each pixel contains a small microchip within the silicone dot. The WS2801 LED driver chip is custom designed for this purpose. We provide an Arduino library for communicating with the pixels (explained in subsequent pages), but if you want to write your own code for other microcontrollers, they’re very easy to communicate with using an SPI-like protocol. For each pixel, one “shifts out” 24 bits of color information — the first data out corresponds to the pixel closest to the microcontroller. To write colors to 10 LEDs, you would issue 240 bytes (10 * 24). Following the data, a 500 microsecond pause will then “latch” the data and display the new LED colors.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Lessons Learned Scaling Airbnb 100X
Wearables — Start with a sketch
Electronics — When do I use X10?
Biohacking — What I Learned from Weighing Myself 15 Times in a Day
No comments yet.
Sorry, the comment form is closed at this time.