31. Case 30: Adjustable lights#

31.1. Introduction#


This is an adjustable LED light. We can adjust the brightness of the light through the potentiometer, so that the light is at our most comfortable brightness.

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31.2. Quick Start#


Materials Required#

Nezha expansion board × 1

micro:bit V2 × 1

Analog Rotation Potentiometer × 1

Rainbow LED ring × 1

Bricks × n

Tips: Purchase Interactive coding accessories pack here.

Connection Diagram#

Inset the micro:bit, connect the rainbow led ring to J1 port and the trimpot to J2 port on Nezha expansion board.

../../_images/case_30_03.png

Assembly Video#

Video link: https://youtu.be/IDo75YvbOB8

Assembly Steps#

../../_images/case_step_30_01.png

../../_images/case_step_30_02.png

../../_images/case_step_30_03.png

../../_images/case_step_30_04.png

../../_images/case_step_30_05.png

31.3. 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_30_10.png

Reference#

Link: https://makecode.microbit.org/_9zD1etLWh36q

You may download it directly below:

Result#

After powering on, the luminance level is able to be adjusted by the trimpot.

../../_images/case-gif-30.gif