12. Case 08: Speed Adjustable Fans#

12.1. Introduction#

Use the potentiometer and the motor to make a knob to control the fan, and you can use the knob to control the speed of the fan.

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12.2. Quick Start#

Materials Required#

Nezha expansion board × 1

micro:bit × 1

Potentiometer × 1

Motor × 1

RJ11 wire × 1

Tips: You may need to purchase Nezha Inventor’s Kit if you want all the above compoents.

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 Video#

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

Assembly Steps#

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12.3. 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:

Result#

Adjust the speed of the fan via the potentiometer.

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