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