9. Case 08: Speed Adjustable Fans

9.1. Introduction

To make a speed adjustable fan with the micro:bit.

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9.2. Quick Start


Materials Required


Nezha expansion board × 1

micro:bit × 1

Potentiometer × 1

Motor × 1

RJ11 wire × 1

Bricks details

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Connection Diagram


  • Connect the potentiometer to J1 and motor to M1 on the Nezha expansion board as the picture shows.

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Assembly

  • Build a device as the picture shows:

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Video reference: https://youtu.be/1-FaQU7Yj0k

9.3. MakeCode Programming


Step 1

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

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For programming, we need to add a package: click “Extensions” at the bottom of the MakeCode drawer and search with “PlanetX” in the dialogue box to download it.

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For programming, we need to add a package: click “Extensions” at the bottom of the MakeCode drawer and search with “nezha” in the dialogue box to download it.

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Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

Step 2

Code as below:

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Reference

Link:https://makecode.microbit.org/_RK1WTKEMyfit

You may also download it directly below:

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Result

  • Adjust the speed of the fan via the potentiometer.