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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.
Buttons
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 #
↓ Download as a Fritzing project
Exercise #
Let’s make the LED glow while the button is pressed.
- Assemble the circuit with a button and LED.
- Set the
PORTvalue of thebuttonnode toD13because it’s connected to the board’s digital port 13. - Link
PRStoLUM. - 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.