Pixelli

ESP32 software to drive a 3D printable LED matrix based on WS2812B LED strips.

Contents

• Introduction
• Feature Overview
• Getting started
  • Clone
  • Build
    • Configuration
    • Environments
• Additional Notes
  • Software Design
  • API
  • Logging
  • Testing
• Contribute
• License

Introduction

This repository provides the implementation of ESP32 software to drive an LED matrix built using 3D printed parts and WS2812B LED strips.

Feature overview

• Easy to configure using ESP Smartconfig
• Rotating display:
  • Current time
  • Current temperature
  • Top headlines
• IP Geolocation

All 3D printed parts can be found on Thingiverse. Look for a future Instructables write-up with the full build details.

Getting Started

Clone

This project does not provide binary builds at this time. Clone this repository to get started:

git clone https://github.com/csetera/pixelli.git

Build

The software can be built and managed using PlatformIO. To learn more about using PlatformIO for development take a look at these tutorials.

Configuration

Before attempting to build for the first time, the project must be configured. Configuration of the project is handled by the config.ini file. Copy config_example.ini to config.ini and configure the various values.

################################################################
# Sample configuration for setup and development
#
# Copy to config.ini and fill in details
################################################################

##############################
# Explicit WiFi configuration
##############################
[wifi]
mdns_name=pixelli
mock_mdns_name=pixelli_mock

##############################
# OTA update related settings
##############################
[ota]
password=xxxxx

##############################
# API Keys
##############################
[api_keys]
abstractapi=xxxxxxx
newsapi=xxxxxx
openweathermap=xxxxxx

There are currently three services required for the software to function:

• Abstract API
  For IP Geolocation
• OpenWeatherMap
  for local weather information
• News API
  To retrieve top news headlines

Each service will require a registered API key in order to function.

Environments

The platformio.ini file provides multiple build environments for use, depending on the goals.

• esp32_matrix_serial
  Targets a matrix of WS2812B LEDs driven by an ESP32. Uploads and logging occur over serial port.
• esp32_matrix_ota
  Targets a matrix of WS2812B LEDs driven by an ESP32. Uploads and logging occur over the air.
• esp32_mock_matrix_serial
  Targets an OLED "mock" matrix driven by an ESP32 to use for testing purposes. Uploads and logging occur over serial port.
• esp32_mock_matrix_ota
  Targets an OLED "mock" matrix driven by an ESP32 to use for testing purposes. Uploads and logging occur over the air.

Web Application

The Vue.js web application for use in controlling Pixelli can be found in the pixelli-web folder. This web application can be accessed at, for example, http://pixelli.local. See the web application Readme for more information about developing and debugging the web application. Deploy the web application to the ESP32, execute the following Platform IO tasks:

1. Custom -> Build Webpp
2. Platform -> Build Filesystem Image
3. Platform -> Upload Filesystem Image

Additional Notes

Software Design

The software is broken up between two primary categories of functionality:

• Services
  API and other data services that are headless.
• Widgets
  Widgets consume the data provided by the Services to produce the output in the display.

The DisplayManager is responsible for managing which widgets are displayed and in what order. Data and widget updates are managed through cooperative multitasking provided by the TaskScheduler library.

API

ESPAsyncWebServer provides the support for REST API implementations. At the moment, there is only one API available:

http://pixelli.local/api/info

Logging

In addition to the standard Serial-based logging, the software also provides a WebSocket based logger endpoint. The WebSocker is available at ws://pixelli.local/ws_serial (assuming the MDNS name has been set to pixelli). An additional custom script Websocket Serial can be found in the PlatformIO Project Tasks view in the Custom section. That script will start up a Python-based WebSocket client to receive the logger output.

Testing

There are no unit tests at this time. The software does provide support for a "mock" matrix comprised of an ESP32 and a 1.5inch RGB OLED Display Module (for example one of these) that is driven by an SSD1351. This allows new functioality to be created without the need to carry around the actual matrix!

Contribute

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

License

Mozilla Public License