This 24 RGB LEDs circular expansion board works with a micro:bit to become a creative piece. Use its onboard buzzer for a tomato timer, microphone for a music spectrometer. Reserve P0/P1 ports connect to boson/gravity sensors for more plays. Decorate with paper-cuts/acrylics (e.g., Chinese knot, cartoon face). Tutorials cover light effects (rotated, sound-controlled, tomato timer).

Docs

Tech Specs

Certifications

1. Example Code for micro:bit-Rotated Circular Light

The 9 RGB LEDs display 9 colors (gradients), and then on the lamp ring the nine RGB LEDs display the 9 colors in a continuous loop just like a waterfall light. Modify the color behind the show color to get other solid color rotation effects.

2. Example Code for micro:bit-Control the Circular Light via Key A, B

Turn on the power, then 24 RGB LEDs display some colors randomly in the beginning. When key A is pressed, executing the waterfall light mode once; When B is pressed, the circular light refreshes the color in every 20ms, and there are 7 colors at all.

3. Example Code for micro:bit-Sound Control Circular Light

Light up 24 RGB LEDs in sequence according to the size of the detected sound, forming a gradual pulsating light ring.

4. Example Code for micro:bit-Tomato Timer

Press key A to start the program and light a LED on the main board in every minute. When all LEDs are on, the buzzer beeps; When key B is pressed, stops the buzzer and stops timing. The circular light refreshes the color in every second. The Pomodoro technique is a simple time management method (25-minute work period).

5. Example Code for micro:bit-Breathing Light

24 RGB LEDs light up red at the same time, the brightness changes from weak to strong in loop, like breathing.

Reference

Parameter	Details
Supply Voltage	3.5~5V
WS2812 Single-line RGB LEDs	x 24
Onboard buzzer	x 1
Onboard microphone	x 1
Number of interfaces	IO expansion board(P0,P1)x2, PH2.0 Power Interface x1, USB power Interface x1

FAQ

Why sometimes the light is partially lighted/ the brightness is low when the sample code is uploaded?

The light ring requires a high power supply. So you need to connect the USB cable or the external battery to power port(USB/ external battery) of the expansion board.

Explore More Related Questions >

Was this article helpful?

TOP

micro: Circular RGB LED Expansion Board

Specification

Pinout