Round NeoPixel RGB LED Module
16 ultra bright smart LED NeoPixels are arranged in a circle with 1.75" (44.5mm) outer diameter. The rings are 'chainable' - connect the output pin of one to the input pin of another. Use only one microcontroller pin to control as many as you can chain together! Each LED is addressable as the driver chip is inside the LED. Each one has ~18mA constant current drive so the color will be very consistent even if the voltage varies, and no external choke resistors are required making the design slim. Power the whole thing with 5 Volt DC (4 to 7 Volts) and you're ready to rock.
There is a single data line with a very timing-specific protocol. Since the protocol is very sensitive to timing, it requires a real-time microcontroller such as an AVR, Arduino, PIC, mbed, etc. It cannot be used with a Linux-based microcomputer or interpreted microcontroller such as the netduino or Basic Stamp. Comes as a single ring with 16 individually addressable RGB LEDs assembled and tested.
Technical Details of 16 Round 5050 RGB Full Color LED Module
Dimensions: 44.5mm / 1.75" outer diameter. 31.75mm / 1.25" inner diameter. 25mm / 0.1" thick.