# Case 30: Adjustable lights ## 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. ![](./images/case_30_01.png) ## Quick Start ### Materials Required Nezha expansion board × 1 micro:bit V2 × 1 Analog Rotation Potentiometer × 1 Rainbow LED ring × 1 Bricks × n ***Tips: You may need to purchase [Nezha Inventor's Kit](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-nezha-48-in-1-inventors-kit-without-micro-bit-board?_pos=2&_sid=ed1b6fbd2&_ss=r) and [Purchase Interactive coding accessories pack here.](https://shop.elecfreaks.com/products/elecfreaks-interactive-coding-accessories-pack?_pos=1&_sid=c75dad35f&_ss=r) if you want all the above components.*** ### 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](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) ## 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](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)