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48 lines
1.4 KiB
Markdown
48 lines
1.4 KiB
Markdown
---
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title: Controlling Servos
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---
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# #11. Controlling Servos
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<div class="ui segment note">
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<span class="ui ribbon label">Note</span>
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This is a web-version of a tutorial chapter embedded right into the XOD IDE.
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To get a better learning experience we recommend to install the
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<a href="/downloads/">desktop IDE</a> or start the
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<a href="/ide/">browser-based IDE</a>, and you’ll see the same tutorial there.
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</div>
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Controlling servos in XOD is just as easy as controlling LEDs. There is a
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special node called `servo`. You will find it in `xod/common-hardware`.
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Its `PORT` pin specifies the digital port on the Arduino that the servo is
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connected to. The pin `VAL` accepts values ranging from 0 to 1; it turns the
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servo shaft from 0 to 180°.
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## Test circuit
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<div class="ui segment note">
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<span class="ui ribbon label">Note</span>
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Although we don’t need the two LEDs used before in this particular lesson you
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can leave them as is on your own breadboard. We’ll use them again in later
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lessons. The same is true for any “disappearing” parts in next chapters.
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</div>
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[↓ Download as a Fritzing project](./circuit.fzz)
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## How-to
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1. Add a `servo` node to the patch
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2. Set its `PORT` pin value
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3. Link the `VAL` input to an output which provides value in range 0–1.
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Turn the potentiometer knob, and watch the servo turn, too!
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[Next lesson →](../12-help/)
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