pxt-calliope/docs/reference/logic/if.md

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# If
### @parent blocks/language
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Conditionally run code depending on whether a [Boolean](/reference/types/boolean) condition is true or false.
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```blocks
if(true) {
}
```
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In the Block Editor, click on the dark blue gear icon (see above) to add an *else* or *if* to the current block.
### Example: adjusting screen brightness
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```blocks
if(input.lightLevel()<100){
led.setBrightness(255);
}
```
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If the [light level](/input/light-level) is `< 100`, this code sets the brightness to `255`:
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### See also
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[while loop](/reference/loops/while), [for](/reference/loops/for), [boolean](/reference/types/boolean)
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