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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("")
    .replace(/([AP])M/, " $1");

Illustrations / Photos

Arduino Diagram


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


<iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>

Learn More



Copyright (c) 2012-2014 Rick Waldron Licensed under the MIT license. Copyright (c) 2015-2019 The Johnny-Five Contributors Licensed under the MIT license.

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