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46 lines
1.4 KiB
Markdown
46 lines
1.4 KiB
Markdown
---
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title: Flip-flop
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---
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# #24. Flip-flop
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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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You can control the behavior of many nodes with pulses. A very useful node is
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`flip-flop`. It acts like a virtual switch, whose states can be controlled by
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pulses.
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Let’s do a classic experiment: blink the LED.
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Each time a pulse arrives at the `TGL` pin, the node toggles the boolean value
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on the `MEM` pin from `false` to `true` and vice versa.
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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. Assemble the circuit with the LED. Do not forget to specify the desired port
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in the `PORT` pin.
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2. Set the flashing frequency in seconds using `IVAL`.
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3. Upload the patch to the Arduino.
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The LED will turn on and off at the frequency you've chosen. Try to control
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the flashing speed of the LED with a potentiometer. To do this, connect the
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output of a pot node to the `IVAL` pin. Each time a pulse arrives at the `TGL`
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pin, the node toggles the boolean value on the `MEM` pin from `false` to `true`
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and vice versa.
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[Next lesson →](../25-multiple-timelines/)
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