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43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
node-red-node-pi-neopixel
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=========================
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A <a href="http://nodered.org" target="_new">Node-RED</a> node to drive a strip
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of Neopixel or WS2812 LEDs.
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Pre-requisites
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--------------
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The Unicorn HAT python drivers need to be pre-installed... This is the easiest way to get the neopixel driver installed... see the
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<a "href=http://learn.pimoroni.com/tutorial/unicorn-hat/getting-started-with-unicorn-hat">
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Pimorini Getting Started with Unicorn HAT</a> page.
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curl -sS get.pimoroni.com/unicornhat | bash
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Install
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-------
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Run the following command in the root directory of your Node-RED install.
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Usually this is `~/.node-red`
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npm install node-red-node-pi-neopixel
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Usage
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-----
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Defaults to a bar chart style mode using configured foreground and background colours.
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It can accept a number in **msg.payload** that can be either the number of pixels, or a percentage of the total length.
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If you want to change the foregound colour, you can set **msg.payload** to a comma separated string of `html_colour,length`.
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To set the background just set **msg.payload** `html_colour` name.
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<a href="http://html-color-codes.info/color-names/" target="_top">Here
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is a list</a> of html_colour names.
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The `nth` pixel is set by **msg.payload** with a CSV string `n,r,g,b`
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A range of pixels from `x` to `y` can be set by **msg.payload**
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with a CSV string `x,y,r,g,b`
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The pixels data line should be connected to Pi physical pin 12 - GPIO 18. *Note:* this may conflict with audio playback.
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