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RGB LED Wireling

This Wireling features a 3.5mm Serial RGB LED, enabling you to add 24-bit resolution color to your Tiny Project! This LED has a built-in driver IC, so it requires special libraries and serial data, not just applied voltage. This Wireling also features a second connector, allowing you to string multiple LEDs together while using just one pin!

Technical Details

SK6812 Mini Specs

  • Built-in power on reset and reset circuit
  • Refresh rate 30 frames per second with data transmission frequency of 800 Kbps
  • 24-bit resolution color

    Power Requirements

    • Voltage: 3.0V - 5.5V 
    • Current: (depends on color and brightness)
      • Red: 30mA
      • Green: 20mA
      • Blue: 30mA
      • White: 65mA

    Pins Used

    • A5/SCL - I²C Serial Clock line
    • A4/SDA - I²C Serial Data line 


    • 10mm x 11mm (.393 inches x .433 inches)
    • Max Height (from lower bottom of Wireling to upper top Wireling Connector): 4.70mm (0.19 inches)
    • Weight: 1 gram (.04 ounces)




    Hardware Assembly

    WirelingZero with Wireling cable connecting from port 0 to RGB LED Wireling

    Please note the orientation of the cable connection to the RGB Wireling to ensure correct functionality

    Depending on the development system you choose, you will need to put together a TinyDuino stack using the 32-pin tan connectors, or you will just need to plug in your Wireling to Port 0 using a Wireling Cable. (You can change this port in the included Arduino Sketch by editing the Analog pin used as noted in the program.)

    Software setup

    For this Wireling, you will need to download the FastLED library. The zip file for this library can be found under the Software section. To install an Arduino library, check out our Library Installation Help Page.

    Make the correct Tools selections for your development board. If unsure, you can double check the Help page that mentions the Tools selections needed for any TinyCircuits processor.

    Upload Program

    RGB LED Wireling Program
     * RGB LED Wireling Example:
     * This example shows how to program an RGB LED Wireling. The default 
     * program when uploaded will cycle NUM_LEDS attached through the 
     * RGB colors at half brightness.
     * Hardware by: TinyCircuits
     * Written by: Laveréna Wienclaw for TinyCircuits
     * Initialized: 7/1/2018
     * Last Updated: 12/4/2019
    #include <FastLED.h>
    #include <Wireling.h>
    #define LED_PIN A0 // Corresponds to Wireling Port 0 (A1 = Port 1, A2 = Port 2, A3 = Port 3)
    #define NUM_LEDS 1 // This is the number of RGB LEDs connected to the pin
    #define COLOR_ORDER GRB
    CRGB leds[NUM_LEDS];
    int brightness = 128; // Brightness is on a scale of 0-255, 128 is 50% brightness
    void setup() {
      // Enable & Power Wireling
      // Initialize RGB LEDs attached to LED_PIN
      FastLED.addLeds<WS2812, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
      pinMode(LED_PIN, OUTPUT);
    void loop() {
      for(int x = 0; x < NUM_LEDS; x++) // cycle through all LEDs attached to LED_PIN
        leds[x] = CRGB( 255, 0, 0); // RED;
        leds[x] = CRGB(0, 255, 0); // GREEN;
        leds[x] = CRGB(0, 0, 255); // BLUE;

    There is a lot you can do with LEDs, especially RGB ones! Some of the most common ways to personalize the lighting effects are by changing the brightness, the colors, or adding more LEDs.


    The default brightness for the attached program is set to 128 out of a scale of 255, so the LEDs are set to 50% brightness. If you want your LEDs dimmer or brighter you would edit the line:

    int brightness = 128;

    to a different value.


    You can edit the RGB arguments in the example program from this tutorial in order to make any color you need. If you want more complex effects, the FastLED ColorPalette example has many predefined color effects, including a rainbow sequence. The example should be downloaded with the FastLED library, and you can find it under FastLED/examples/ColorPalette. You will just need to change the LED_PIN to match the Wireling port you are using (A0-A3).

    Adding more LEDs!

    If you want to string along more RGB LEDs, it is made easy with the Wireling platform. You just need another Wireling Cable, and RGB Wireling to string along as many as you want. Then just change the variable #define NUM_LEDS 1 at the top of your program to match the number of LEDs you have attached.

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