27. Case 26: The Volume Indicator

27.1. Introduction

To make a color-changing device that is reflected with its ambient sound level.


27.2. Quick Start

Materials Required

Nezha expansion board × 1

micro:bit V2 × 1

Rainbow LED ring × 1

Bricks × n

Tips:Purchase Interactive coding accessories pack here.

Bricks Required


Connection Diagram

  • Inset the micro:bit, and connect the rainbow LED ring to IIC port on Nezha expansion board.


Bricks Build-up

  • Build a device as the pictures indicate:



Video link: https://youtu.be/4tFv6rWx8uM

27.3. MakeCode Programming

Step 1

Click “Advanced” in the MakeCode drawer to see more choices.


We need to add a package for programming. Click “Extensions” in the bottom of the drawer and search with “nezha” to download it.


Note: If you met a tip indicating the codebase might be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

Step 2

Programme as the pictures indicate



Link: https://makecode.microbit.org/_5cCW2APhK263

You may download it directly below:



  • After powering on, the rainbow LED ring lights up in different colors reflecting with the ambient sound level.