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docs/lessons/night-light/activity.md

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+# night light activity
+
+Change the brightness of the micro:bit.
+
+### ~avatar avatar
+
+### @video td/videos/night-light-0
+
+Welcome! This tutorial will teach you how to change the brightness of the micro:bit. Let's get started!
+
+### ~
+
+The brightness of the LED screen can be changed by using the `set brightness` function. This function takes a number between ``0`` (off) and ``255`` (full brightness).
+
+Let's build a little app that dims the screen when pressing button ``A``.
+
+Add the code `show LEDs` and select all LEDs to turn on all the LEDs. Don't hesitate to run your code to see what happens.
+
+```blocks
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    `)
+```
+
+The screen starts with a 50% brightness value by default (128). Add a new line of code to set the full brightness (255) using `set brightness`.
+
+```blocks
+led.setBrightness(255)
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    `)
+```
+
+Add a new event handler for `on button pressed(A)` and add the code to set the brightness to `64`.
+
+
+```blocks
+led.setBrightness(255)
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    `)
+input.onButtonPressed(Button.A, () => {
+    led.setBrightness(64)
+})
+
+```
+
+
+
+### ~avatar boothing
+
+Excellent, you're ready to continue with the [challenges](/microbit/lessons/night-light/challenges)!
+
+### ~
+

docs/lessons/night-light/challenges.md

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+# night light challenges
+
+Coding challenges for night light.
+
+## Before we get started
+
+Complete the following [guided tutorial](/microbit/lessons/night-light/activity), your code should look like this:
+
+
+```blocks
+led.setBrightness(255)
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    `)
+input.onButtonPressed(Button.A, () => {
+    led.setBrightness(64)
+})
+
+```
+### Challenge 1
+
+### @video td/videos/night-light-2
+
+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)
+})
+```
+
+
+**Challenge 3**
+
+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.