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53 lines
1.6 KiB
Markdown
53 lines
1.6 KiB
Markdown
---
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title: Adjusting Map Range
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---
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# #14. Adjusting Map Range
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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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After the previous lesson, the `map` node linearly maps the
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20–50°C range to the 0–90° servo rotation. Let’s raise the sensitivity.
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Say, we want to map 15–30°C to 0–90° rotation.
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However, what will happen if the `X` pin of the `map` receives data that
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is outside the input range (10 or 42, for example)? The output value which is
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a servo angle will fall outside the desired range too.
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For such cases there is a sibling node called `map-clip`. It works the
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same way, but any input that is out of range will be rounded to `Smin` or
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`Smax`. Thus, if `X` receives a value of 10, the `map-clip` node will
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accept it as 15, and 42 will be accepted as 30.
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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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Just use the `map-clip` instead of the `map` if you want the
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output range to be guaranteed.
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If you prefer °F, you can easily translate the data from the
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thermometer with the `c-to-f` node from `xod/units`. The range will be
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59–95°F.
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[Next lesson →](../15-buttons/)
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