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46 lines
1.5 KiB
Markdown
46 lines
1.5 KiB
Markdown
---
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title: Pulse Counting
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---
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# #23. Pulse Counting
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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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Let’s make a funky watch hand. Now we have everything to do this.
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The clock will be the servo. Using the `count` node, we will change its
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rotation from 0° to 180° in one minute.
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The `count` node works as a simple counter. Each time it receives a pulse, it
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increases the number that it gives out, in increments of the `STEP` pin.
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## Test circuit
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[↓ Download as a Fritzing project](./circuit.fzz)
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## How-to
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1. In the `clock` node, set the value of `IVAL` to `1` second.
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2. In the `count` node, set `STEP` to `0.017`. This means that every time the
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pulse arrives on the `INC` pin (in our case, once per second), the node will
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increase the number on the output by 0.017. For the servo node, this is
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approximately 3°.
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3. Upload the patch to the Arduino.
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You will see that the servo is “ticking” every second. In one minute, it will
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reach 180°. The `count` node works as a simple counter. Each time it receives a
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pulse, it increases the number that it gives out, in increments of the `STEP`
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pin
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[Next lesson →](../24-flip-flop/)
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