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Note This is a web-version of a tutorial chapter embedded right into the XOD IDE. To get a better learning experience we recommend to install the desktop IDE or start the browser-based IDE, and you’ll see the same tutorial there.


Screenshot of 104-button

Here is a button node from xod/common-hardware.

Take a look at button outputs. It has a PRS pin, which is true whenever it is pressed. And DONE pin, which pulses when reading is done, wherever the button is pressed or not.

This is a standard idiom for side-effect nodes representing hardware or, for example, the Internet.

Circuit #

Assembling button to Uno

↓ Download as a Fritzing project

Exercise #

Let’s make the LED glow while the button is pressed.

  1. Assemble the circuit with a button and LED.
  2. Set the PORT value of the button node to D13 because it’s connected to the board’s digital port 13.
  3. Link PRS to LUM.
  4. Upload your patch.

Hold the button to turn the LED on.

Additional exercise #

Place the already familiar node flip-flop between button and led to switch the LED on or off on each press.

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