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42 lines
1.3 KiB
Markdown
42 lines
1.3 KiB
Markdown
---
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title: If-else branching
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---
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# #19. If-else branching
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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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All the comparison nodes return true or false.
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Let's imagine that you need to turn the servo to a certain angle, for instance
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to 45° when you receive true, and to 135° when you receive false. How can we
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make that work?
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There is an `if-else` node in `xod/core`. The `COND` pin of this node checks
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the boolean input value. If `COND` receives true, the node sets the value
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from the `T` pin to the `R` pin. When it receives false, it sets the value
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from the `F` pin to the `R` pin.
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Now simply set the `T` value to 0.25 and the `F` value to 0.75 to make things
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work.
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## Test circuit
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[↓ Download as a Fritzing project](./circuit.fzz)
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Now, if the comparison condition is true, the servo will turn to the angle from
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the `T` pin of the `if-else` node or, otherwise, to the angle set in the `F`
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pin of the same node.
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[Next lesson →](../20-fade/)
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