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47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
---
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title: Constant Nodes
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---
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# #08. Constant Nodes
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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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You can specify pin values manually with the Inspector. However, the data can
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be transferred from the output pin of one node to the input pin of another
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node. This is the core idea of XOD programming.
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The simplest source of output values is a constant node. Its output value
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never changes during the program execution. Although, while programming you
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can set its value as usual, with the Inspector.
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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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## How-to
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1. Find the `constant-number` node under `xod/core` and add it to the patch.
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2. Connect its `VAL` output pin with an input of another node. To do this,
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simply click on the `VAL` pin and then on the destination pin. You will then
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see a green line connecting the two pins. This line is called a *link*.
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3. Set a desired constant value via Inspector.
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[Next lesson →](../09-pot/)
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