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Real-time communication with WebSockets and a Raspberry Pi

This repository contains the code used during the HamOnt JavaScript talk on May 30th of 2019 about real-time communication with WebSockets and a Raspberry Pi by Jenifer Champagne.

HamOnt JavaScript Meetup

https://www.meetup.com/HamOnt-JavaScript/

Folks of all JavaScript-related interests and skill levels! Please do feel welcome to go to a meetup if you're int he area!

Talk Recording

https://youtu.be/scDg3HaVwas

Talk Errata

  • It looks like the async vs Promise conflicts I mentioned were likely specific to Bluebird Promises

Code Setup

This code was designed for use with a RaspberryPi. Unfortunately several GPIO (General Purpose Input/Output) node modules were using outdate libraries which were not compatible with the Raspberry Pi 3B+ used in the demo. As such, the wiringpi command line utility (gpio) was used as it was compatible with the device used.

  • Install WebSocket node module npm install
  • Launch the WebSocket server while initialising the GPIOs npm start

Note: This will not work on a system without the GPIO / wiringpi utility. If you are on a Raspberry Pi system and find yourself without the utility, you can install it with the following command: sudo apt install wiringpi -y