# night light quiz change the brightness of the @boardname@. ## Name ## Directions Use this activity document to guide your work in the [night light tutorial](/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 @boardname@, write the code that sets all the LEDs to full brightness and turns on all the LEDs ![](/static/mb/lessons/night-light-0.png) <br /> ## 3. If the picture below is the @boardname@, write the code that sets the screen brightness to 50% (128) and turns on all the LEDs. ![](/static/mb/lessons/night-light-1.png) <br/> ## 4. If the picture below is the @boardname@, write the code turns off all the LEDs. ![](/static/mb/lessons/night-light-2.png)