mirror of
https://github.com/node-red/node-red-nodes.git
synced 2025-03-01 10:37:43 +00:00
43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
node-red-node-pi-neopixel
|
|
=========================
|
|
|
|
A <a href="http://nodered.org" target="_new">Node-RED</a> 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</a> 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
|
|
|
|
Usage
|
|
-----
|
|
|
|
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.
|
|
<a href="http://html-color-codes.info/color-names/" target="_top">Here
|
|
is a list</a> 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.
|