Matrix

Control an LED matrix in real-time.

Leverages the MQTT protocol using Mosca, MQTT.js, and Paho Python.

View screenshots from Redditors here

Broken into 3 main applications:

1. MQTT/UI Server
   • Single Node.js application with two main functions:
     1. Run a Mosca MQTT broker.
     2. Serve web pages using Express.
        • Each UI client subscribes to the Mosca broker.
   • Start with npm start.
     • Remember to npm install.
     • Requires a MongoDB instance.
     • NGINX is an optional dependency.
   • Commands:
     • View logs with pm2 logs matrix.
     • See online users with pm2 trigger matrix online.
     • Ban a user with pm2 trigger matrix ban <ip>.
     • Unban a user with pm2 trigger matrix unban <ip>.
2. LED Client
   • Raspberry Pi client which subscribes to the Mosca broker.
   • Controls an 8x8 RGB LED matrix.
   • Start with sudo python app.py.
     • Requires Python 3.6 and dependencies in requirements.txt.
     • Run pip install -r requirements.txt to install dependencies.
3. Stream Server
   • Streams live video of the LED matrix to the UI clients.
   • Runs on the same Raspberry Pi as the LED client.
   • Start with npm start.
     • Remember to npm install.

References

• Mosca by Matteo Collina - Node.js MQTT broker
• MQTT.js by Matteo Collina - Use MQTT in the browser
• MQTT over WebSockets by Matteo Collina - Use MQTT over WebSockets
• Paho Python by Eclipse - Use MQTT in Python
• rpi_ws281x by Jeremy Garff - Control WS281X RGB LEDs through Raspberry Pi
• raspivid-stream by Tim Perry - Capture video from Raspberry Pi
• pi-cam by Tim Perry - Working example of raspivid-stream
• h264-live-player by François Leurent - Play h264 video in the browser