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44 lines
1.2 KiB
Markdown
44 lines
1.2 KiB
Markdown
---
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title: Fractional Numbers and PWM
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---
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# #04. Fractional Numbers and PWM
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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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XOD uses fractional numbers (also known as floats) extensively. For example,
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the `LUM` pin on the `led` node can take values from 0 to 1.
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0 means absolute minimum of LED brightness. Basically, it means that LED is
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off. 1 means full brightness. You can control LED brightness by setting
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fractional values on `LUM` pin.
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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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Use Inspector to enter a value with floating point. The following notations
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are supported:
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* 0.4
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* .4 (same as 0.4)
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* 4e-6 (scientific, 4×10<sup>-6</sup> = 0.000004)
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[Next lesson →](../05-wiring)
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