9. Case 08: Speed Adjustable Fans#

9.1. 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.

../../_images/case_08_01.png

9.2. 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.

../../_images/case_08_03.png

Assembly Video#

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

Assembly Steps#

../../_images/case_step_08_01.png

../../_images/case_step_08_02.png

../../_images/case_step_08_03.png

../../_images/case_step_08_04.png

../../_images/case_step_08_05.png

../../_images/case_step_08_06.png

../../_images/case_step_08_07.png

../../_images/case_step_08_08.png

../../_images/case_step_08_09.png

../../_images/case_step_08_10.png

../../_images/case_step_08_11.png

../../_images/case_step_08_12.png

../../_images/case_step_08_13.png

9.3. MakeCode Programming#

Step 1#

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

../../_images/case_01_10.png

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.

../../_images/case_01_11.png

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.

../../_images/case_03_09.png

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:#

../../_images/case_08_10.png

Reference#

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

You may also download it directly below:

Result#

Adjust the speed of the fan via the potentiometer.

../../_images/case-gif-08.gif