Home AutomationDone completely with Javascript

The BasicsComponents1.A controller/driver (Power Electronic Switch)2.Logic circuit for controller/driver3.Software interface for logic circuit4.Server-Client, or Socket based model (the API)5.User Interface

What we will useController : BeagleBone Black

A microcomputer board (like Raspberry Pi), with multiple pinouts, running on an ARM processor. Regular Debian/Ubuntu Linux OS. Language (HW control): BoneScript

A Node.js plugin developed especially for boards like BBB which provides a JS interface to turn current to the pins of a BBB on or off (or read the current for input PINS). BoneScript is similar to the Arduino language.

What we will useLanguage (API) : Socket.io or Node.js REST

If we directly access a webpage hosted on the BBB, we can use socket.io, or we can create a RESTful API on the BBB. Language (UI): AngularJS

We can use any MVC or pure JS too. This is the frontend for the given REST API on the BBB to control the states of the switches.

How switching works Power Electronics – Controlling Electrical

appliances with Electronics Common switches - BJT, MOSFET, TRIAC,

DIAC A 5V-1A cirtuit can control a 220V-15A circuit.

How switching works

BoneScriptSetting a PIN output to high current

var b = require('bonescript');b.pinMode('USR0', b.OUTPUT);b.digitalWrite('USR0', b.HIGH);

BoneScriptRead input current from a PIN

var b = require('bonescript');b.pinMode('P8_19', b.INPUT);b.digitalRead('P8_19', printStatus);function printStatus(x) {

console.log('x.value = ' + x.value);console.log('x.err = ' + x.err);

}

BoneScriptBlink a LED

var b = require('bonescript');var led = "USR3";var state = 0;

b.pinMode(led, 'out');toggleLED = function() {

state = state ? 0 : 1;b.digitalWrite(led, state);

};

timer = setInterval(toggleLED, 100);

stopTimer = function() {clearInterval(timer);

};

setTimeout(stopTimer, 3000);

Basic home automation with Bonescript

Connect LEDs on some of the PINS of the BBBCreate a webpage on the BBBMake buttons on the page. Each button calls a digitalWrite function corresponding to connected LEDs.On page load read PIN states and updates button accordingly. Red color for off, Green for on (or something similar).Connect the BBB to WLAN/Internet. Access IP of BBB from Laptop/Mobile, click the buttons and watch the LEDs go ON and OFF. *** Make a video, or show live demo of this if WiFi available ***

Why this isn’t practically applicable ?

HAVE TO open the particular webpage on the particular IP. Who remembers URLs and IPs ?No App for mobile, have to do via browser. Clients cannot be built for devices that do not have JS support.

Solution : REST ApiWe will create a simple REST API using Node.js and Express 4. var express = require('express');var app = express();

app.get('/switch/fan/:state', function(req, res) {if (req.params.state === 1)

// digitalWrite high to the required PINelse

// digitalWrite low to the required PIN});app.listen(8080);

Solution : REST ApiWe make REST calls from the client to turn the fan off or on http://bbb.ip/switch/fan/0 -- **to turn off the fan**

http://bbb.ip/switch/fan/1 -- ** to turn on the fan**

Now we can make whatever client we want (MVC client app, or Android/iOS app, or even a command line based noGUI app).

AngularJS frontend Create buttons with asynchronous calls to rest

API Responsive UI + Material/Bootstrap themes.

Such design, much awesome. Can also turn into Android/iOS clients using

Ionic etc.

GPIO/I2C run through General Purpose I/O – Kernel interface to

control currents over sysfs. Some info on why using C/C++ or shell to

actually control the currents is more efficient than Python/Node.