Build Your Own-IoT Platform Part 2: Connecting to Devices

摘要

Last month, in Part 1 (Circuit Cellar 371, June 2021) [1], we set up our very own IoT platform. Just to refresh your memory, these are the steps we went through in that article: 1) Digital Ocean Droplet setup 2) Installing Apache, PhpMyAdmin and MySQL. 3) Installation of Node.js, Node-RED and the Mosquitto MQTT library Here, in Part 2, we will use the MQTT and Node-RED features of our platform to build our first project! The project demonstrates both the control and monitoring capabilities of our platform, enabling us to control relay modules (in other words, the appliances connected to these modules) through a Node-RED dashboard we create. It also monitors sensor values from the same dashboard.