webthing-sk6812 v0.1.0

webthing-sk6812

A WebThings Thing for controlling a strip of SK6812 RGBW LEDs from a Raspberry Pi.

Pre-Install

This script relies on the rpi-ws281x NPM module, which does not currently support the SK6812. Until this pull request is approved, you will need to manually download this forked copy of the rpi-ws281x module.

Run the following commands from one level above.

$ git clone https://github.com/AlanDThiessen/rpi-ws281x.git
$ cd rpi-ws281x
$ git checkout sk6812

Install

$ npm install webthing-sk6812

Configure

Modify the parameters of the config object in index.js to match the hardware configuration.

• numLeds: The total number of LEDs connected to the Raspberry Pi.
• gpio: The GPIO line to use to control the LEDs (default is PWM GPI 18).
• dma: The GMA channel to use.
  • Default is 10.
  • This may need to be changed if running on a Raspberry Pi 3 or later.

Run

Root/sudo privileges are required to write to PWM GPI line on a Raspberry Pi.

Start the following command on the Raspberry Pi.

$ sudo node ./index.js

Control

1. Use the WebThings Gateway to control this device.
2. Ensure the Web Thing Adapter is installed.
3. On the Things screen, click the + button to search and add devices. It should find the device SK6812.