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docs/blocks/logic/if.md

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+# @extends
+
+## #examples
+
+## Example: adjusting screen brightness
+
+If the [light level](/reference/input/light-level) is `< 100`, this code sets the brightness to `255` when the button A is pressed:
+
+```blocks
+input.onButtonPressed(Button.A, () => {
+    if(input.lightLevel()<100){
+        led.setBrightness(255);
+    }
+})
+```