led-digits-clock.md

LED - Digital Clock

Demonstrates using 7 Segment Digits and Intel Galileo Gen 2 to create a clock! This example can easily be ported to use any other supported platform.

Galileo Diagram

Fritzing diagram: docs/breadboard/led-digits-clock-galileo.fzz

 

Run this example from the command line with:

node eg/led-digits-clock-galileo.js

const moment = require("moment");
const { Board, Led } = require("johnny-five");
const Galileo = require("galileo-io");

const board = new Board({
  io: new Galileo()
});

board.on("ready", () => {
  var digits = new Led.Digits({
    pins: {
      data: 2,
      cs: 3,
      clock: 4,
    }
  });

  setInterval(() => digits.print(time()), 1000);
});

function time() {
  /*
    The desired display looks something
    like these examples:

      02.25.54 P
      12.30.00 A

    moment doesn't have an option for
    a single letter meridiem (nor should it,
    that would be silly), so we need to
    manipulate the string a bit to so that
    it the string matches our desired display.
   */
  return moment().format("hh.mm.ssA")
    .replace(/([AP])M/, " $1");
}

Illustrations / Photos

Arduino Diagram

Fritzing diagram: docs/breadboard/led-digits-clock-arduino.fzz

 

<iframe width="560" height="315" src="https://www.youtube.com/embed/4A3SlE6Unco" frameborder="0" allowfullscreen></iframe>

Learn More

• JavaScript: A Digital Clock with Johnny-Five

 

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.