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webserver.js
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webserver.js
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var http = require('http').createServer(handler); //require http server, and create server with function handler()
var io = require('socket.io')(http) //require socket.io module and pass the http object (server)
var sensorLib = require("node-dht-sensor");
var fs = require('fs');
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) {
console.log("socket connected");
var app = {
sensors: [
{
name: "dht22",
type: 22,
pin: 4
}
],
read: function() {
for (var sensor in this.sensors) {
var readout = sensorLib.read(
this.sensors[sensor].type,
this.sensors[sensor].pin
);
var humid= readout.humidity.toFixed(1);
var temp_c= readout.temperature.toFixed(1);
// convert Celsius to Fahrenheit
var temp_f= (temp_c*1.8)+32
// round result to one decimal place
var temp_f= temp_f.toFixed(1);
var results = JSON.stringify({tempf: temp_f, tempc: temp_c, humidity: humid});
socket.emit('results', results);
// console.log(results);
}
setTimeout(function() {
app.read();
}, 10000);
}
};
app.read();
});
process.on('SIGINT', function () { //on ctrl+c
process.exit(); //exit completely
});