HerrZatacke/express.js

## express.js
const express = require('express');

const server = express();

server.get('/', express.static(process.cwd()));

server.post('/', (req, res) => {
  res.send('a file...');
});

server.use((error, req, res, next) => {
  console.log(error.message);
  res.status(500);
  res.send(error.stack);
});

server.listen(3000, () => {
  console.log('Example server listening on port 3000!');
});

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Wattiswong?</title>
  </head>
  <body>
    <form action="/" method="POST" enctype='multipart/form-data'>
      <input type="file" name="file" required/><br />
      <button type="submit">!</button>
    </form>
  </body>
</html>

## package.json
{
  "name": "ws281x_express",
  "version": "0.0.1",
  "description": "",
  "main": "index.js",
  "scripts": {
    "ws281x": "node ws281x.js",
    "express": "node express.js"
  },
  "author": "Herr_Zatacke",
  "license": "MIT",
  "dependencies": {
    "express": "^4.16.3",
    "rpi-ws281x-native": "^0.8.2"
  }
}

## ws281x.js
var ws281x = require('rpi-ws281x-native');

var NUM_LEDS = 8;
var pixelData = new Uint32Array(NUM_LEDS);

ws281x.init(NUM_LEDS);

// ---- trap the SIGINT and reset before exit
process.on('SIGINT', function () {
  ws281x.reset();
  process.nextTick(function () { process.exit(0); });
});


// ---- animation-loop
var offset = 0;
setInterval(function () {
  for (var i = 0; i < NUM_LEDS; i++) {
    pixelData[i] = blink(offset + i);
  }

  offset = (offset + 1) % 256;
  ws281x.render(pixelData);
}, 100);

console.log('Press <ctrl>+C to exit.');

function blink(pos) {
  return (pos % 3) ? 0 : 16777215;
}
	const express = require('express');

	const server = express();

	server.get('/', express.static(process.cwd()));

	server.post('/', (req, res) => {
	res.send('a file...');
	});

	server.use((error, req, res, next) => {
	console.log(error.message);
	res.status(500);
	res.send(error.stack);
	});

	server.listen(3000, () => {
	console.log('Example server listening on port 3000!');
	});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Wattiswong?</title>
	</head>
	<body>
	<form action="/" method="POST" enctype='multipart/form-data'>
	<input type="file" name="file" required/><br />
	<button type="submit">!</button>
	</form>
	</body>
	</html>
	{
	"name": "ws281x_express",
	"version": "0.0.1",
	"description": "",
	"main": "index.js",
	"scripts": {
	"ws281x": "node ws281x.js",
	"express": "node express.js"
	},
	"author": "Herr_Zatacke",
	"license": "MIT",
	"dependencies": {
	"express": "^4.16.3",
	"rpi-ws281x-native": "^0.8.2"
	}
	}
	var ws281x = require('rpi-ws281x-native');

	var NUM_LEDS = 8;
	var pixelData = new Uint32Array(NUM_LEDS);

	ws281x.init(NUM_LEDS);

	// ---- trap the SIGINT and reset before exit
	process.on('SIGINT', function () {
	ws281x.reset();
	process.nextTick(function () { process.exit(0); });
	});


	// ---- animation-loop
	var offset = 0;
	setInterval(function () {
	for (var i = 0; i < NUM_LEDS; i++) {
	pixelData[i] = blink(offset + i);
	}

	offset = (offset + 1) % 256;
	ws281x.render(pixelData);
	}, 100);

	console.log('Press <ctrl>+C to exit.');

	function blink(pos) {
	return (pos % 3) ? 0 : 16777215;
	}