node-red-nodes/hardware/neopixel

node-red-node-pi-neopixel

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

Pre-requisites

The Neopixel python driver need to be pre-installed... The easiest way to get the driver installed is to use the Unicorn HAT drivers install script... see the Pimoroni Getting Started with Unicorn HAT page.

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

Install

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

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

Usage

Defaults to a bar chart style mode using configured foreground and background colours. It can also display a needle (single pixel) type gauge.

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 foreground colour, you can set msg.payload to a comma separated string of html_colour,length or length,html_colour

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

You can also select shift modes where a single colour pixel is added to either the start or the end of the strip, shifting all the others along by one.

The nth pixel can be set by msg.payload with a CSV string n,r,g,b , where r, g and b are 0-255.

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