66 lines
1.3 KiB
Markdown
66 lines
1.3 KiB
Markdown
# night light activity
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Change the brightness of the micro:bit.
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### ~avatar avatar
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Welcome! This tutorial will teach you how to change the brightness of the micro:bit. Let's get started!
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### ~
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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).
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Let's build a little app that dims the screen when pressing button ``A``.
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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.
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```blocks
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basic.showLeds(`
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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`)
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```
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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`.
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```blocks
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led.setBrightness(255)
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basic.showLeds(`
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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`)
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```
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Add a new event handler for `on button pressed(A)` and add the code to set the brightness to `64`.
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```blocks
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led.setBrightness(255)
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basic.showLeds(`
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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`)
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input.onButtonPressed(Button.A, () => {
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led.setBrightness(64)
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})
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```
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### ~avatar boothing
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Excellent, you're ready to continue with the [challenges](/lessons/night-light/challenges)!
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### ~
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