35 lines
950 B
Markdown
35 lines
950 B
Markdown
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# Fade in
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Gradually increase the [LED screen](/microbit/device/screen) brightness until the LED lights are at full brightness.
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```sig
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led.fadeIn(700);
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```
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### Parameters
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* ms - [Number](/microbit/reference/types/number); the speed by which the screen brightness is increased, expressed in milliseconds (1,000 milliseconds = 1 second). The smaller the number the faster the screen brightness increased.
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### Example: fading dot
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The following code turns on centre LED and then gradually increases and decreases the screen brightness (the centre LED pulses 5 times):
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```blocks
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led.plot(2, 2)
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for (let i = 0; i < 5; i++) {
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led.setBrightness(0)
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led.fadeIn(100)
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basic.pause(100)
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led.fadeOut(100)
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}
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```
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### Lessons
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[glowing sword](/microbit/lessons/glowing-sword)
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### See also
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[brightness](/microbit/reference/led/brightness), [fade out](/microbit/reference/led/fade-out), [set brightness](/microbit/reference/led/set-brightness)
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