# night light quiz

change the brightness of the BBC micro:bit #LED #image #brightness #fade #docs

## Name

## Directions

Use this activity document to guide your work in the [night light tutorial](/microbit/lessons/night-light/activity)

Answer the questions while completing the tutorial. Pay attention to the dialogues!

## 1. Describe what "led->set brightness" does ? 

## 2. If the picture below is the BBC micro:bit, write the code that sets all the LEDs to full brightness and turns on all the LEDs

![](/static/mb/lessons/night-light-0.png)

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## 3. If the picture below is the BBC micro:bit, write the code that sets the screen brightness to 50% (128) and turns on all the LEDs.

![](/static/mb/lessons/night-light-1.png)

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## 4. If the picture below is the BBC micro:bit, write the code turns off all the LEDs.

![](/static/mb/lessons/night-light-2.png)