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63 lines
2.1 KiB
Markdown
63 lines
2.1 KiB
Markdown
---
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title: Smoother Changes
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---
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# #20. Smoother Changes
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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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In the previous examples our servo turns to the set angle at its maximum speed.
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High speed is not always necessary and can damage the servo itself if the shaft
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hits an obstacle.
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Let’s improve our patch by making the servo move more smoothly. To achieve
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that, we’ll need to set the `VAL` pin value along with a series of transitional
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values. There’s a node for that, and it's called `fade`.
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The `fade` node is in `xod/core`. This node returns a smooth series of
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transitional values, so it will smoothen our servo motion.
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* The `TARG` pin waits for a target value.
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* The `RATE` pin is a number that defines amount of change for the transitional
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values per each second.
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The output pin returns 0 at the start of the program. Then, it starts to move
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toward the `TARG` value by the `RATE` steps. The value of the output pin is
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saved, so if the `TARG` value changes, the output will start to move to this
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value from the last one returned.
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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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Now, the servo will turn at a speed of 18° per second (0.1 = 18°).
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<div class="ui segment note">
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<span class="ui ribbon label">The<br/>End</span>
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<p>
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Congratulations! You’ve completed the crash-course tutorial. Now you are
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officially a Xoder. Welcome on board!
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</p>
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<p>
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Actually, the tutorial is not ready 100% yet and will grow. Meantime, read <a
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href="/docs/guide/">guide</a> articles to learn XOD better and feel free to ask
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any questions and give feedback on our <a
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href="https://forum.xod.io">forum</a>.
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</p>
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</div>
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