RGBPixelClock (community library)


Name Value
Name RGBPixelClock
Version 1.1.3
Installs 1261
License MIT license
Author Paul Kourany @peekay123
URL https://github.com/pkourany/RGBPixelClock_IDE
Repository https://github.com/pkourany/RGBPixelClock_IDE.git
Download .tar.gz
All Versions 1.1.3, 1.1.2, 1.1.1, 1.1.0

RGBPongClock for RGB Pixel Clock Kit

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Device OS Version:

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Library Read Me

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#RGB Pixel Clock (RGBPongClock) app for use with RGB Pixel Clock Kit

Adapted for Particle Core by Paul Kourany, April 2015

  • Updated for Particle Photon/Electron and v4 RGB Matrix Panel Shield, May 2016
  • Add rainbow clock face, Aug 24/2016

Andrew Holmes @pongclock

Inspired by, and shamelessly derived from Nick's LED Projects

Videos of the clock in action:




Particle devices found here: https://www.particle.io/

Uses an Adafruit 16x32 or 32x32 RGB matrix panel

Can optionally use this microphone


This is an adaptation of Andrew Holmes (mostly complete) RGBPongClock for Arduino using the Particle Core, Photon or Electron.

The adaptation uses a Cloud Webhook to request a 7-day forecast from api.openweathermap.org and, using the webhook's JSON parsing feature, receives a temperature and a weather condition ID for each of the 7 days. Without parsing, the return payload is typically about 2KB but with parsing done by the webhook, the return payload is less than 100 bytes!

Some functions such as birthday, Halloween and Christmas display were removed in order for the code to fit in the original Core flash. The clock setting code was also removed since Particle devices can sync time to the Particle cloud. The Spectrum clock was modified to use fix_fft(*) an 8-bit "lite" fft library with less RAM and code requirements. Finally, a Particle.function() was created to allow setting of specific clock modes since the mode will rotate at 5 minute intervals (primarily for demo purposes)

(*) Google "fix_fft" to get more details on this library


In order for RGBPongClock to get weather from api.openweathermap.org without doing all the data parsing in code, a JSON parsing webhook is used:

"event": "uniqueHookName",
"url": "http://api.openweathermap.org/data/2.5/forecast/daily",
"requestType": "POST",
"headers": null,
"query": {
"q": "",
"mode": "json",
"units": "",
"cnt": 7,
"appid": ""
"responseTemplate": "",
"json": null,
"auth": null,
"noDefaults": true,
"devideid": null,
"mydevices": true

The webhook file is provided (weather.json)


The RGBPongClock.ino file contains a some #defines to configure the webhook and other details necessary for using openweathermap:

#define HOOK_RESP defines the "event" name of the webhook. It must match the "event" field in the webhook JSON file.

#define HOOK_PUB defines the webhook subscription details. The name after the hook-response/ part be the same as the one defined in #define HOOK_RESP.

#define DEFAULT_CITY define the default city to get weather for. The "Ottawa,ON" part may be changed as required (city, state)

`#define API_KEY' defines your openweathermap.org API key

#define UNITS define metric or imperial (US) units

Sample defines:

#define HOOK_RESP        "hook-response/uniqueHookName"
#define HOOK_PUB        "uniqueHookName"
#define DEFAULT_CITY    "\"mycity\":\"Ottawa,ON\""    // Change to desired default city,state
#define API_KEY        "\"apikey\":\"xxxxxxxxxxxxxxxxxxxxxxxxxxx\""  //your key instead of x's
#define UNITS            "\"units\":\"metric\""        // Change to "imperial" for farenheit units

NOTE: openWeatherMap now requires an API KEY to be specified. This key is available on their site and is free depending on usage.

The JSON parsing template is defined by responseTemplate following the Mustache stateless query format.

DON'T FORGET to create the webhook using Particle CLI or the Particle Dashboard webhook interface:

particle webhook create weather.json (or whatever you named your webhook file)


RGBPongClock makes use of the following libraries:

RGBMatrixPanel (including SparkIntervalTimer)
Adafruit_GFX library

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