This document discusses using JavaScript and the Johnny-Five framework to control hardware devices like Arduinos in real-time using Firebase. It provides advantages of JavaScript, an overview of Johnny-Five which is a robotics programming framework, and how to use Firmata to communicate between microcontrollers and software. It then shows basic usage of connecting Johnny-Five and Firebase to control relays connected to an Arduino board in real-time.

1. IoT em tempo real com Firebase e
JavaScript

2. Henri Cavalcante
CTO at wiquadro.com.br
@henricavalcante

4. JavaScript Advantages:
● Fast, very fast
● Asynchronous
● Event-based
● Top 1 language in the world
● Large community

6. Johnny-Five
Johnny-Five is the original JavaScript
Robotics programming framework. Released
by Bocoup in 2012, Johnny-Five is
maintained by a community of passionate
software developers and hardware
engineers. Over 75 developers have made
contributions towards building a
robust, extensible and composable
ecosystem.
+

9. Firmata
Firmata is a protocol for communicating with microcontrollers from software
on a computer (or smartphone/tablet, etc). The protocol can be implemented
in firmware on any microcontroller architecture as well as software on any
computer software package (see list of client libraries below).
Flash your Arduino with Standard Firmata:
● Connect the Arduino to your PC using the USB Cable
● Open the Arduino IDE, select: File > Examples > Firmata > StandardFirmata
● Click the "Upload" button.
● The text "Done Uploading" will appear once the upload is complete.

11. Basic Usage
MCU
Serial
Socket
Sensors
Leds
. . .

12. const five = require('johnny-five');
const board = new five.Board();
const Firebase = require('firebase');
const relays = new Firebase('https://io16natal.firebaseio.com').child('relay');
board.on('ready', () => {
const lamps = {
'01': new five.Relay(8),
'02': new five.Relay(9),
'03': new five.Relay(10),
'04': new five.Relay(11)
}
relays.on('value', (snap) => {
snap.forEach((lamp) => { lamps[lamp.key()][lamp.val()]() });
});
});
Example

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