node-red-node-pi-neopixel

A Node-RED node to drive a strip of Neopixel or WS2812 LEDs.

Pre-requisites

The Unicorn HAT python drivers need to be pre-installed... This is the easiest way to get the neopixel driver installed... see the <a "href=http://learn.pimoroni.com/tutorial/unicorn-hat/getting-started-with-unicorn-hat"> Pimorini Getting Started with Unicorn HAT page.

curl -sS get.pimoroni.com/unicornhat | bash

Run the following command in the root directory of your Node-RED install. Usually this is ~/.node-red

npm install node-red-node-pi-neopixel

Defaults to a bar chart style mode using configured foreground and background colours.

It can accept a number in msg.payload that can be either the number of pixels, or a percentage of the total length.

If you want to change the foregound colour, you can set msg.payload to a comma separated string of html_colour,length.

To set the background just set msg.payload html_colour name. Here is a list of html_colour names.

The nth pixel is set by msg.payload with a CSV string n,r,g,b

A range of pixels from x to y can be set by msg.payload with a CSV string x,y,r,g,b

The pixels data line should be connected to Pi physical pin 12 - GPIO 18. Note: this may conflict with audio playback.