27. Case 26: The Volume Indicator

27.1. Introduction

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

../../_images/case_28_01.png

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

../../_images/case_28_02.png

Connection Diagram


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

../../_images/case_28_03.png

Bricks Build-up


  • Build a device as the pictures indicate:

../../_images/case_28_04.png

../../_images/case_28_05.png

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

27.3. MakeCode Programming


Step 1


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

../../_images/case_01_10.png

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

../../_images/case_03_09.png

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

../../_images/case_28_10.png

Reference

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

You may download it directly below:

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Result

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