pxt-calliope/docs/blocks/on-start.md
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2017-03-14 12:07:17 -07:00

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# @extends
## #exstart
In this example, ``on start`` sets a dimmer brightness on the screen and the button handler shows a string.
```blocks
input.onButtonPressed(Button.A, () => {
basic.showString("Hello!")
})
led.setBrightness(50)
```