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44 lines
1.4 KiB
Markdown
44 lines
1.4 KiB
Markdown
---
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title: Input from a Potentiometer
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---
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# #09. Input from a Potentiometer
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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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Another ubiquitous source of values is a potentiometer (or simply “pot” for
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short). It is very handy to adjust some parameters smoothly.
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There is a special node `pot` to read values from a potentiometer. You will
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find it in the `xod/common-hardware` library.
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## Test circuit
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[↓ Download as a Fritzing project](./circuit.fzz)
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## How-to
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1. Add the `pot` node to your patch.
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2. Set the `PORT` pin value on the `pot` node to 0 if you have connected
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the potentiometer to Arduino port A0 as shown above.
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3. Link the `pot` node `VAL` pin to input pins of nodes to control.
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In our example, if you turn the potentiometer knob, it will affect the
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brightness of the LEDs. Depending on the angle of the knob, the `pot` node
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returns a value from 0.0 to 1.0 to the `VAL` pin, and that value is transferred
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to the `LUM` pins of both LED nodes.
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[Next lesson →](../10-math/)
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