Building an internet connected lighting system

In this tutorial we’ll use the ARM mbed IoT Device Platform to build a complete connected lighting system that you can deploy in your house or office. The system consists of one (or more) extra-bright RGB LEDs hooked up to an mbed OS development board. The lights can be turned on or off by a motion sensor, but are also connected to the internet, so you can change their color. The system uses mbed Device Connector to connect to the internet, and is secured end-to-end.

We’ll go over all the steps required to build the hardware, the cloud integration, and the application. At the end of the tutorial you’ll have a firm understanding of building complete connected IoT solutions on the mbed IoT Device Platform. You’ll also have a cool light.


We need the following hardware:

  • A development board capable of running mbed OS.
  • A way of connecting to the internet. Choose one:
  • A breadboard, to hook up the components.
  • A PIR sensor to detect motion.
  • An RGB LED - preferably an extra-bright one.
    • For a better effect you can also use a Grove Chainable LED.
    • After building the original application, you can easily swap out the LED for something fancier.
  • Some jumper wires. Both male-male and male-female.
  • Resistors: 1x 100 Ohm, 2x 220 Ohm.

Components neededComponents required to build our lighting system. Top row: RGB LED, PIR sensor, ESP8266 Wi-Fi module. Bottom row: breadboard, NXP FRDM-K64F, jumper wires.

We also need an account on to access the online compiler and mbed Device Connector.