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Add Pi Neopixel node

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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.

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/**
* Copyright 2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var colours = {
'aqua':'#00FFFF',
'aliceblue':'#F0F8FF',
'antiquewhite':'#FAEBD7',
'black':'#000000',
'off':'#000000',
'blue':'#0000FF',
'cyan':'#00FFFF',
'darkblue':'#00008B',
'darkcyan':'#008B8B',
'darkgreen':'#006400',
'darkturquoise':'#00CED1',
'deepskyblue':'#00BFFF',
'green':'#008000',
'lime':'#00FF00',
'mediumblue':'#0000CD',
'mediumspringgreen':'#00FA9A',
'navy':'#000080',
'springgreen':'#00FF7F',
'teal':'#008080',
'midnightblue':'#191970',
'dodgerblue':'#1E90FF',
'lightseagreen':'#20B2AA',
'forestgreen':'#228B22',
'seagreen':'#2E8B57',
'darkslategray':'#2F4F4F',
'darkslategrey':'#2F4F4F',
'limegreen':'#32CD32',
'mediumseagreen':'#3CB371',
'turquoise':'#40E0D0',
'royalblue':'#4169E1',
'steelblue':'#4682B4',
'darkslateblue':'#483D8B',
'mediumturquoise':'#48D1CC',
'indigo':'#4B0082',
'darkolivegreen':'#556B2F',
'cadetblue':'#5F9EA0',
'cornflowerblue':'#6495ED',
'mediumaquamarine':'#66CDAA',
'dimgray':'#696969',
'dimgrey':'#696969',
'slateblue':'#6A5ACD',
'olivedrab':'#6B8E23',
'slategray':'#708090',
'slategrey':'#708090',
'lightslategray':'#778899',
'lightslategrey':'#778899',
'mediumslateblue':'#7B68EE',
'lawngreen':'#7CFC00',
'aquamarine':'#7FFFD4',
'chartreuse':'#7FFF00',
'gray':'#808080',
'grey':'#808080',
'maroon':'#800000',
'olive':'#808000',
'purple':'#800080',
'lightskyblue':'#87CEFA',
'skyblue':'#87CEEB',
'blueviolet':'#8A2BE2',
'darkmagenta':'#8B008B',
'darkred':'#8B0000',
'saddlebrown':'#8B4513',
'darkseagreen':'#8FBC8F',
'lightgreen':'#90EE90',
'mediumpurple':'#9370DB',
'darkviolet':'#9400D3',
'palegreen':'#98FB98',
'darkorchid':'#9932CC',
'yellowgreen':'#9ACD32',
'sienna':'#A0522D',
'brown':'#A52A2A',
'darkgray':'#A9A9A9',
'darkgrey':'#A9A9A9',
'greenyellow':'#ADFF2F',
'lightblue':'#ADD8E6',
'paleturquoise':'#AFEEEE',
'lightsteelblue':'#B0C4DE',
'powderblue':'#B0E0E6',
'firebrick':'#B22222',
'darkgoldenrod':'#B8860B',
'mediumorchid':'#BA55D3',
'rosybrown':'#BC8F8F',
'darkkhaki':'#BDB76B',
'silver':'#C0C0C0',
'mediumvioletred':'#C71585',
'indianred':'#CD5C5C',
'peru':'#CD853F',
'chocolate':'#D2691E',
'tan':'#D2B48C',
'lightgray':'#D3D3D3',
'lightgrey':'#D3D3D3',
'thistle':'#D8BFD8',
'goldenrod':'#DAA520',
'orchid':'#DA70D6',
'palevioletred':'#DB7093',
'crimson':'#DC143C',
'gainsboro':'#DCDCDC',
'plum':'#DDA0DD',
'burlywood':'#DEB887',
'lightcyan':'#E0FFFF',
'lavender':'#E6E6FA',
'darksalmon':'#E9967A',
'palegoldenrod':'#EEE8AA',
'violet':'#EE82EE',
'azure':'#F0FFFF',
'honeydew':'#F0FFF0',
'khaki':'#F0E68C',
'lightcoral':'#F08080',
'sandybrown':'#F4A460',
'beige':'#F5F5DC',
'mintcream':'#F5FFFA',
'wheat':'#F5DEB3',
'whitesmoke':'#F5F5F5',
'ghostwhite':'#F8F8FF',
'lightgoldenrodyellow':'#FAFAD2',
'linen':'#FAF0E6',
'salmon':'#FA8072',
'oldlace':'#FDF5E6',
'warmwhite':'#FDF5E6',
'bisque':'#FFE4C4',
'blanchedalmond':'#FFEBCD',
'coral':'#FF7F50',
'cornsilk':'#FFF8DC',
'darkorange':'#FF8C00',
'deeppink':'#FF1493',
'floralwhite':'#FFFAF0',
'fuchsia':'#FF00FF',
'gold':'#FFD700',
'hotpink':'#FF69B4',
'ivory':'#FFFFF0',
'lavenderblush':'#FFF0F5',
'lemonchiffon':'#FFFACD',
'lightpink':'#FFB6C1',
'lightsalmon':'#FFA07A',
'lightyellow':'#FFFFE0',
'magenta':'#FF00FF',
'mistyrose':'#FFE4E1',
'moccasin':'#FFE4B5',
'navajowhite':'#FFDEAD',
'orange':'#FFA500',
'orangered':'#FF4500',
'papayawhip':'#FFEFD5',
'peachpuff':'#FFDAB9',
'pink':'#FFC0CB',
'red':'#FF0000',
'seashell':'#FFF5EE',
'snow':'#FFFAFA',
'tomato':'#FF6347',
'white':'#FFFFFF',
'yellow':'#FFFF00',
'amber':'#FFD200'
};
var p1 = /^\#[A-Fa-f0-9]{6}$/
module.exports.getRGB = function(col) {
col = col.toString().toLowerCase();
if (col in colours) {
col = colours[col];
}
if (p1.test(col)) {
r = parseInt(col.slice(1,3),16);
g = parseInt(col.slice(3,5),16);
b = parseInt(col.slice(5),16);
return r+","+g+","+b;
}
else {
return null;
}
}
module.exports.getHex = function(col) {
col = col.toString().toLowerCase();
if (col in colours) {
return colours[col];
}
else { return null; }
}
module.exports.HexRGB = function(hex) {
try {
r = parseInt(hex.slice(1,3),16);
g = parseInt(hex.slice(3,5),16);
b = parseInt(hex.slice(5),16);
return r+","+g+","+b;
}
catch(e) { return null; }
}

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#!/bin/bash
#
# Copyright 2016 IBM Corp.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
BASEDIR=$(dirname $0)
sudo python -u $BASEDIR/neopix.py $@

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#!/usr/bin/python
#
# Copyright 2016 IBM Corp.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Import library functions we need
import sys
import time
from neopixel import *
# LED strip configuration:
LED_COUNT = 8 # Number of LED pixels.
LED_PIN = 18 # GPIO pin connected to the pixels (must support PWM!).
LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
LED_DMA = 5 # DMA channel to use for generating signal (try 5)
LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
if sys.version_info >= (3,0):
print("Sorry - currently only configured to work with python 2.x")
sys.exit(1)
LED_COUNT = int(sys.argv[1])
WAIT_MS = int(sys.argv[2])
# Define functions which animate LEDs in various ways.
def setPixel(strip, i, color):
"""Set a single pixel"""
strip.setPixelColor(i, color)
strip.show()
def setPixels(strip, s, e, color, wait_ms=30):
"""Set pixels from s(tart) to e(nd)"""
for i in range(s, e+1):
strip.setPixelColor(i, color)
strip.show()
time.sleep(wait_ms/1000.0)
def colorWipe(strip, color, wait_ms=30):
"""Wipe color across display a pixel at a time."""
for i in range(strip.numPixels()):
strip.setPixelColor(i, color)
strip.show()
time.sleep(wait_ms/1000.0)
def wheel(pos):
"""Generate rainbow colors across 0-255 positions."""
if pos < 85:
return Color(pos * 3, 255 - pos * 3, 0)
elif pos < 170:
pos -= 85
return Color(255 - pos * 3, 0, pos * 3)
else:
pos -= 170
return Color(0, pos * 3, 255 - pos * 3)
def rainbow(strip, wait_ms=20, iterations=2):
"""Draw rainbow that fades across all pixels at once."""
for j in range(256*iterations):
for i in range(strip.numPixels()):
strip.setPixelColor(i, wheel((i+j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
def rainbowCycle(strip, wait_ms=20, iterations=2):
"""Draw rainbow that uniformly distributes itself across all pixels."""
for j in range(256*iterations):
for i in range(strip.numPixels()):
strip.setPixelColor(i, wheel(((i * 256 / strip.numPixels()) + j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
# Main loop:
if __name__ == '__main__':
# Create NeoPixel object with appropriate configuration.
strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS)
# Intialize the library (must be called once before other functions).
strip.begin()
## Color wipe animations.
colorWipe(strip, Color(127, 0, 0), WAIT_MS) # Red wipe
colorWipe(strip, Color(0, 127, 0), WAIT_MS) # Green wipe
colorWipe(strip, Color(0, 0, 127), WAIT_MS) # Blue wipe
colorWipe(strip, Color(0, 0, 0), WAIT_MS) # Off wipe
## Rainbow animations.
#rainbow(strip)
#rainbowCycle(strip)
#colorWipe(strip, Color(0, 0, 0)) # Off wipe
while True:
try:
data = raw_input()
bits = data.split(',')
if len(bits) == 3:
colorWipe(strip, Color(int(bits[0]), int(bits[1]), int(bits[2])), WAIT_MS)
if len(bits) == 4:
setPixel(strip, int(bits[0]), Color(int(bits[1]), int(bits[2]), int(bits[3]) ))
if len(bits) == 5:
setPixels(strip, int(bits[0]), int(bits[1]), Color(int(bits[2]), int(bits[3]), int(bits[4]) ), WAIT_MS)
except (EOFError, SystemExit): # hopefully always caused by us sigint'ing the program
sys.exit(0)
except Exception as ex:
print "bad data: "+data

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<!--
Copyright 2016 IBM Corp.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<script type="text/x-red" data-template-name="rpi-neopixels">
<div class="form-row">
<label for="node-input-pixels"><i class="fa fa-sun-o"></i> LEDs</label>
<input type="text" id="node-input-pixels" placeholder="number" style="width:60px;"> in the string
</div>
<div class="form-row">
<label for="node-input-bgnd"><i class="fa fa-picture-o"></i> Background</label>
<input type="text" id="node-input-bgnd" placeholder="HTML colour name or rrr,ggg,bbb">
</div>
<div class="form-row">
<label for="node-input-fgnd"><i class="fa fa-picture-o"></i> Foreground</label>
<input type="text" id="node-input-fgnd" placeholder="HTML colour name or rrr,ggg,bbb">
</div>
<div class="form-row">
<label for="node-input-mode"><i class="fa fa-cogs"></i> Mode</label>
<select id="node-input-mode" style="width:73%">
<option value="pcent">Percent of length</option>
<option value="pixels">Number of pixels</option>
</select>
</div>
<div class="form-row">
<label for="node-input-wipe"><i class="fa fa-clock-o"></i> Wipe time</label>
<input type="text" id="node-input-wipe" placeholder="number" style="width:60px;"> mS
</div>
<br/>
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name">
</div>
</script>
<script type="text/x-red" data-help-name="rpi-neopixels">
<p>Raspberry Pi node to drive a string of neopixel or ws2812 LEDs.</p>
<p>Defaults to a bar chart style mode using configured foreground and background colours.
It can accept a number in <b>msg.payload</b> that can be either the number of pixels, or a percentage of the total length.</p>
<p>If you want to change the foregound colour, you can send a CSV of <i>html colour,length</i>.</p>
<p>To set the background just send an <i>html colour</i> name.
<a href="http://html-color-codes.info/color-names/" target="_top">Here
is a list</a> of html colour names.<p>
<p>The <i>nth</i> pixel is set by <b>msg.payload</b> with a CSV string <i>n,r,g,b</i>
<!-- <p>The whole strip is set by <b>msg.payload</b> with a CSV string <i>r,g,b</i> -->
<p>A range of pixels from <i>x</i> to <i>y</i> can be set by <b>msg.payload</b>
with a CSV string <i>x,y,r,g,b</i>
<p>The pixels data line should be connected to Pi physical pin 12 - GPIO 18. <i>Note:</i>
this may conflict with audio playback.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('rpi-neopixels',{
category: 'Raspberry Pi',
label: 'Raspberry Pi',
color:"#c6dbef",
defaults: {
name: { value:"" },
pixels: { value:"", required:true, validate:RED.validators.number() },
bgnd: { value:"" },
fgnd: { value:"" },
wipe: { value:"40", required:true, validate:RED.validators.number() },
mode: { value:"pcent" }
},
inputs:1,
outputs:0,
icon: "rpi.png",
align: "right",
label: function() {
return this.name||this.pixels+" neopixels";
},
labelStyle: function() {
return this.name?"node_label_italic":"";
}
});
</script>

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/**
* Copyright 2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
var spawn = require('child_process').spawn;
var fs = require('fs');
var colors = require('./colours.js');
var piCommand = __dirname+'/neopix';
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
//RED.log.info(RED._("rpi-gpio.errors.ignorenode"));
throw "Info : "+RED._("rpi-gpio.errors.ignorenode");
}
if (!fs.existsSync('/usr/local/lib/python2.7/dist-packages/neopixel.py')) {
RED.log.warn("Can't find neopixel.py python library");
throw "Warning : Can't find neopixel.py python library";
}
if ( !(1 & parseInt ((fs.statSync(piCommand).mode & parseInt ("777", 8)).toString (8)[0]) )) {
RED.log.error(piCommand + " command is not executable");
throw "Error : "+RED._("rpi-gpio.errors.mustbeexecutable");
}
// the magic to make python print stuff immediately
process.env.PYTHONUNBUFFERED = 1;
function piNeopixelNode(n) {
RED.nodes.createNode(this,n);
this.pixels = n.pixels || 1;
this.bgnd = n.bgnd || "0,0,0";
this.fgnd = n.fgnd || "128,128,128";
this.mode = n.mode || "pcent";
this.wipe = Number(n.wipe || 40);
if (this.wipe < 0) { this.wipe = 0; }
var node = this;
var p1 = /^\#[A-Fa-f0-9]{6}$/
var p2 = /^[0-9]+,[0-9]+,[0-9]+$/
var p3 = /^[0-9]+,[0-9]+,[0-9]+,[0-9]+$/
var p4 = /^[0-9]+,[0-9]+,[0-9]+,[0-9]+,[0-9]+$/
function inputlistener(msg) {
if (msg.hasOwnProperty("payload")) {
var pay = msg.payload.toString().toUpperCase();
var parts = pay.split(",");
if (parts.length <= 2) {
if (parts.length === 2) { // it's a colour and length
if (isNaN(parseInt(parts[1]))) { parts = parts.reverse(); }
if (colors.getRGB(parts[0])) {
node.fgnd = colors.getRGB(parts[0]);
var l = parts[1];
if (node.mode === "pcent") { l = parseInt(l / 100 * node.pixels + 0.5); }
l = l - 1;
pay = "0,"+l+","+node.fgnd+"\n"+(l+1)+","+(node.pixels-1)+","+node.bgnd;
}
else { node.warn("Invalid payload : "+pay); return; }
}
else {
if (isNaN(pay)) { // it's a single colour word so set background
if (colors.getRGB(pay)) {
node.bgnd = colors.getRGB(pay);
pay = node.bgnd;
}
else { node.warn("Invalid payload : "+pay); return; }
}
else { // it's a single number so just draw bar
var l = pay;
if (node.mode === "pcent") { l = parseInt(l / 100 * node.pixels + 0.5); }
l = l - 1;
pay = "0,"+l+","+node.fgnd+"\n"+(l+1)+","+(node.pixels-1)+","+node.bgnd;
}
}
}
if ((parts.length <= 2) || p2.test(pay) || p3.test(pay) || p4.test(pay) ) {
if (parts.length === 3) { node.bgnd = pay; }
node.child.stdin.write(pay+"\n"); // handle 3 parts, 4 part and 5 parts in the python
}
else { node.warn("Invalid payload : "+pay); }
}
}
node.child = spawn(piCommand, [node.pixels, node.wipe]);
node.status({fill:"green",shape:"dot",text:"ok"});
node.on("input", inputlistener);
node.child.stdout.on('data', function (data) {
if (RED.settings.verbose) { node.log("out: "+data+" :"); }
});
node.child.stderr.on('data', function (data) {
if (RED.settings.verbose) { node.log("err: "+data+" :"); }
});
node.child.on('close', function (code) {
node.child = null;
if (RED.settings.verbose) { node.log(RED._("rpi-gpio.status.closed")); }
if (node.done) {
node.status({fill:"grey",shape:"ring",text:"closed"});
node.done();
}
else { node.status({fill:"red",shape:"ring",text:"stopped"}); }
});
node.child.on('error', function (err) {
if (err.errno === "ENOENT") { node.error(RED._("rpi-gpio.errors.commandnotfound")); }
else if (err.errno === "EACCES") { node.error(RED._("rpi-gpio.errors.commandnotexecutable")); }
else { node.error(RED._("rpi-gpio.errors.error")+': ' + err.errno); }
});
node.on("close", function(done) {
node.status({fill:"grey",shape:"ring",text:"closed"});
if (node.child != null) {
node.done = done;
node.child.kill('SIGKILL');
}
else { done(); }
});
if (node.bgnd) {
if (node.bgnd.split(',').length === 1) {
node.bgnd = colors.getRGB(node.bgnd);
}
node.child.stdin.write(node.bgnd+"\n");
}
if (node.fgnd) {
if (node.fgnd.split(',').length === 1) {
node.fgnd = colors.getRGB(node.fgnd);
}
}
}
RED.nodes.registerType("rpi-neopixels",piNeopixelNode);
}

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hardware/neopixel/package.json Normal file
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{
"name" : "node-red-node-pi-neopixel",
"version" : "0.0.1",
"description" : "A Node-RED node to output to a neopixel (ws2812) string of LEDS from a Raspberry Pi.",
"dependencies" : {
},
"repository" : {
"type":"git",
"url":"https://github.com/node-red/node-red-nodes/tree/master/hardware/neopixel"
},
"license": "Apache-2.0",
"keywords": [ "node-red", "ws2812", "neopixel" ],
"node-red" : {
"nodes" : {
"rpi-neopixels": "neopixel.js"
}
},
"scripts" : {
"postinstall" : "scripts/checklib.js"
},
"author": {
"name": "Dave Conway-Jones",
"email": "ceejay@vnet.ibm.com",
"url": "http://nodered.org"
}
}

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hardware/neopixel/scripts/checklib.js Executable file
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#!/usr/bin/env node
var fs = require('fs');
if (!fs.existsSync('/usr/local/lib/python2.7/dist-packages/neopixel.py')) {
console.warn("WARNING : Can't find neopixel.py python library");
console.warn("WARNING : Please install using the following command");
console.warn("WARNING : Note: this uses root...");
console.warn("WARNING : curl -sS get.pimoroni.com/unicornhat | bash\n");
//process.exit(1);
}
else {
console.log("Neopixel Python library found OK.\n")
}