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- var http = require('http').createServer(handler); //require http server, and create server with function handler()
- var fs = require('fs'); //require filesystem module
- var io = require('socket.io')(http) //require socket.io module and pass the http object (server)
- var Gpio = require('onoff').Gpio; //include onoff to interact with the GPIO
- var LED = new Gpio(4, 'out'); //use GPIO pin 4 as output
- var pushButton = new Gpio(18, 'in', 'both'); //use GPIO pin 17 as input, and 'both' button presses, and releases should be handled
- http.listen(8080); //listen to port 8080
- function handler (req, res) { //create server
- fs.readFile(__dirname + '/public/index.html', function(err, data) { //read file index.html in public folder
- if (err) {
- res.writeHead(404, {'Content-Type': 'text/html'}); //display 404 on error
- return res.end("404 Not Found");
- }
- res.writeHead(200, {'Content-Type': 'text/html'}); //write HTML
- res.write(data); //write data from index.html
- return res.end();
- });
- }
- io.sockets.on('connection', function (socket) {// WebSocket Connection
- var lightvalue = 0; //static variable for current status
- pushButton.watch(function (err, value) { //Watch for hardware interrupts on pushButton
- if (err) { //if an error
- console.error('There was an error', err); //output error message to console
- return;
- }
- lightvalue = value;
- socket.emit('light', lightvalue); //send button status to client
- });
- socket.on('light', function(data) { //get light switch status from client
- lightvalue = data;
- if (lightvalue != LED.readSync()) { //only change LED if status has changed
- LED.writeSync(lightvalue); //turn LED on or off
- }
- });
- });
- process.on('SIGINT', function () { //on ctrl+c
- LED.writeSync(0); // Turn LED off
- LED.unexport(); // Unexport LED GPIO to free resources
- pushButton.unexport(); // Unexport Button GPIO to free resources
- process.exit(); //exit completely
- });
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