led.md

LED

Basic LED example

LED on pin 13 (Arduino UNO)

LED inserted directly into pin 13

Fritzing diagram: docs/breadboard/led-13.fzz

 

Run this example from the command line with:

node eg/led.js

const { Board, Led } = require("johnny-five");
const board = new Board();

board.on("ready", () => {
  const led = new Led(13);

  // This will grant access to the led instance
  // from within the REPL that's created when
  // running this program.
  board.repl.inject({
    led
  });

  led.blink();
});

Illustrations / Photos

LED on pin 13 (Arduino UNO)

LED inserted directly into pin 13

LED on pin 13 with breadboard and resistor (Arduino UNO)

LED on a breadboard and demonstrating use of a resistor

Fritzing diagram: docs/breadboard/led-resistor.fzz

 

LED on pin 13 (Arduino Mega)

LED inserted directly into pin 13

Fritzing diagram: docs/breadboard/led-13-mega.fzz

 

Additional Notes

This script will make led available in the REPL, by default on pin 13. Now you can try, e.g.:

>> led.stop() // to stop blinking
then
>> led.off()  // to shut it off (stop doesn't mean "off")
then
>> led.on()   // to turn on, but not blink

 

License

Copyright (c) 2012-2014 Rick Waldron waldron.rick@gmail.com Licensed under the MIT license. Copyright (c) 2015-2023 The Johnny-Five Contributors Licensed under the MIT license.