pxt-calliope/docs/lessons/night-light/challenges.md

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# night light challenges
Coding challenges for night light.
## Before we get started
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Complete the following [guided tutorial](/lessons/night-light/activity), your code should look like this:
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```blocks
led.setBrightness(255)
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
input.onButtonPressed(Button.A, () => {
led.setBrightness(64)
})
```
### Challenge 1
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What if we want to turn off all the LEDs? Let's do this by setting the brightness to `0` when button `B` is pressed. Add an event handler with `on button pressed(B)` add `set brightness(0)` to turn off the LEDs.
```blocks
led.setBrightness(255)
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
input.onButtonPressed(Button.A, () => {
led.setBrightness(64)
})
input.onButtonPressed(Button.B, () => {
led.setBrightness(0)
})
```
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### Challenge 3
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Add an event handler with `on shake` to change the LED brightness back to a `255`.
* `Run main` your script to see the LEDs change brightness.