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Expand Up @@ -23,7 +23,7 @@ So how does digital signals work? Well, it is quite simple! In the case of the b
For the LED, we can do sort of the reverse: we can write a HIGH / LOW state to it. If we connect the LED to a **digital pin** on the Arduino, we can therefore turn it on or off, by writing a **"1"** or **"0"** to it.

<video width="100%" loop autoplay>
<source src="assets/button+led.mp4" type="video/mp4" />
<source src="assets/button-led.mp4" type="video/mp4" />
</video>

## Exercise 1: Read a Button
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