droidcon: Touchiot/main.js@e8ccd40d0ef6 (annotated)

Touchiot/main.js@e8ccd40d0ef6 (annotated)

Touchiot/main.js

Thu, 04 Jun 2015 14:50:33 +0200

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 04 Jun 2015 14:50:33 +0200
changeset 0: e8ccd40d0ef6
permissions: -rw-r--r--

Genesis of lecture sources for Droidcon Berlin 2015 in Postbahnhof.

 /*jslint node:true,vars:true, unparam:true */
 /*jshint unused:true */
 /*
 The Touch Notifier Node.js sample application distributed within Intel® XDK IoT Edition under the IoT with Node.js Projects project creation option showcases how to read digital data from a Grover Starter Kit Plus – IoT Intel® Edition Touch Sensor, start a web server and communicate wirelessly using WebSockets.
 MRAA - Low Level Skeleton Library for Communication on GNU/Linux platforms
 Library in C/C++ to interface with Galileo & other Intel platforms, in a structured and sane API with port nanmes/numbering that match boards & with bindings to javascript & python.
 Steps for installing MRAA & UPM Library on Intel IoT Platform with IoTDevKit Linux* image
 Using a ssh client:
 . echo "src maa-upm http://iotdk.intel.com/repos/1.1/intelgalactic" > /etc/opkg/intel-iotdk.conf
 . opkg update
 . opkg upgrade
 Article: https://software.intel.com/en-us/html5/articles/iot-touch-notifier-nodejs-and-html5-samples
 */
 //MRAA Library was installed on the board directly through ssh session
 var mraa = require("mraa");
 var mqtt = require("mqtt");
 var http = require("http");
 function setOpenhabState(txtNewState) {
     http.get("http://192.168.42.245:8080/CMD?door_bell="+txtNewState);
 }
 //GROVE Kit Shield D6 --> GPIO6
 //GROVE Kit Shield D2 --> GPIO2
 function startSensorWatch(socket) {
     'use strict';
     var touch_sensor_value = 0, last_t_sensor_value;
     var mqtcli = mqtt.connect('mqtt://raspeinz.local/');
     //Touch Sensor connected to D2 connector
     var digital_pin_D2 = new mraa.Gpio(2);
     digital_pin_D2.dir(mraa.DIR_IN);
     //Buzzer connected to D6 connector
     var digital_pin_D6 = new mraa.Gpio(6);
     digital_pin_D6.dir(mraa.DIR_OUT);
     digital_pin_D6.write(0);
     setInterval(function () {
         touch_sensor_value = digital_pin_D2.read();
         if (touch_sensor_value === 1 && last_t_sensor_value === 0) {
             console.log("Buzz ON!!!");
             socket.emit('message', "present");
             mqtcli.publish('door', 'ding');
             //mqtcli.end(); // end connection
 // FUR ULRICH!            //http.get("http://ulno.local:8080/CMD?door_bell=ON");
             digital_pin_D6.write(touch_sensor_value);
         } else if (touch_sensor_value === 0 && last_t_sensor_value === 1) {
             console.log("Buzz OFF!!!");
             //socket.emit('message', "absent");
             mqtcli.publish('door', 'dong');
 // FUR ULRICH!            //http.get("http://ulno.local:8080/CMD?door_bell=OFF");
             digital_pin_D6.write(touch_sensor_value);
         }
         last_t_sensor_value = touch_sensor_value;
     }, 500);
 }
 //Create Socket.io server
 //var http = require('http'); // See top requires
 var app = http.createServer(function (req, res) {
     'use strict';
     res.writeHead(200, {'Content-Type': 'text/plain'});
     res.end('<h1>Hello world from Intel IoT platform!</h1>');
 }).listen(1338);
 var io = require('socket.io')(app);
 console.log("Sample Reading Touch Sensor");
 //Attach a 'connection' event handler to the server
 io.on('connection', function (socket) {
     'use strict';
     console.log('a user connected');
     //Emits an event along with a message
     socket.emit('connected', 'Welcome');
     //Start watching Sensors connected to Galileo board
     startSensorWatch(socket);
     //Attach a 'disconnect' event handler to the socket
     socket.on('disconnect', function () {
         console.log('user disconnected');
     });
 });