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41 lines
1.2 KiB
Markdown
41 lines
1.2 KiB
Markdown
---
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title: Clock Node
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---
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# #22. Clock Node
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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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Many tasks require you to set a specific frequency for the pulse generation.
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For this, we need a new node `clock`. It can produce pulse signals at time
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intervals specified by the `IVAL` pin. This way, we can control the frequency
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of data collection from our sensors.
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Try to set the `IVAL` pin in the `clock` node to `2`. This means that it will
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send a pulse every two seconds.
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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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The circuit is the same as for the previous lesson.
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</div>
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[↓ Download as a Fritzing project](./circuit.fzz)
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Slowly turn the potentiometer knob. You will see that the readings are being
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taken and the servo reacts to them every two seconds.
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[Next lesson →](../23-count/)
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