Script all the things!

SwissJeese 2014

by @gnz

Gonzalo Casas
mobile team @ local.ch

Enchanted objects

Ordinary items

Extraordinary abilities

Interconnected

Reactive

"Any sufficiently advanced technology is indistinguishable from magic."

- Arthur C. Clarke

Microcontrollers

Proprietary/crippled toolchains

Very tricky to debug

High barrier to entry

Soldering iron?

Arduino

Makes things better

But debugging is still tricky

Multitasking is hard

Edit-Compile-Run Cycle

Javascript ♥ Microcontrollers

Zero-friction hardware

The JS Hardware Explosion

Net for Things

WiFi

Mesh networks

BLE

Why Javascript?

Dev community == massive user base

Instant gratification

Events

Javascript events in 1997

<a href="http://home.netscape.com/comprod/mirror/index.html">
   <img onmouseover="this.src='on.gif'" onmouseout="this.src='off.gif'">
   Best viewed with Netscape Navigator 3.0
</a>

Events in Espruino

setWatch(function() { 
    console.log('Yay!');
}, BTN1, { repeat:true, edge:"rising" });

Atwood's Law

"Any application that can be written in JavaScript will eventually be written in JavaScript."

- Jeff Atwood

Espruino Specs

32-bit 72MHz ARM Cortex M3 CPU

256KB of Flash memory, 48KB of RAM

44 GPIO Pins

Espruino features

Pure Javascript

Ridiculously easy to use

Fast, cheap and efficient prototyping

No dev left behind

Modules

http = require('http');

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Turn on on-board LED

LED1.write(1);

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Connect to WiFi

wlan = require("CC3000").connect();
wlan.connect("SSID", "omg_his_password_is_cleartext!",
  function() { // yay! });

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Http Server

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.write('Hello, out there! Is the movie over?!');
  res.end();
}).listen(80);

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Demo Time

Let's see the Espruino Web IDE

Now, let's try something different:

http://goo.gl/GoJONt

Where do I Start?

Get yourself a JS board

...and header packs & breadboard

Check AdaFruit & SparkFun Learn

Build, document & share (Fritzing)

SCRIPT ALL THE THINGS!

Thank you!

Questions?

Credits

Concert by art*throb
Vessyl by MyVessyl
HAL 9000 by OpenClips
KIM-1 by Wikimedia Commons
Arduino by Wikimedia Commons
BMO Dance by Cartoon Networks
Mesh network by Pinocc.io
OctoCat by GitHub
Espruino by Adafruit
Cable salad by Wikimedia Commons
Espruino on Keyboard by Remy Sharp
20 questions, 1954 by DuMont Television/Rosen Studios

Move Robot

var GO = { BACK: 0b0101, FORWARD: 0b1010, LEFT: 0b0110, RIGHT: 0b1001 }; 
function move(motorState, time) {
    if (!running) return;

    digitalWrite(outputs, motorState);
    setTimeout(stop, time);
}

function stop() {
    digitalWrite(outputs, 0);
}

Distance

hcsr04 = require("HC-SR04");
sensor = hcsr04.connect(A0, A1, function(distance) {
    console.log('Distance is: ' + distance);
});

setInterval(sensor.trigger, 350);

BACKUP ON OBSTACLE

function backup() {
    inManouver = true;
    digitalWrite(outputs, GO.BACK);
    setTimeout(function() {
        digitalWrite(outputs, GO.RIGHT);
        setTimeout(function() {
            inManouver = false;
            stop();
        }, 500);
    }, 1000);
}sensor = hcsr04.connect(A0, A1, function(distance) {
    if (running && !inManouver && distance < 20) {
        backup();
    }
});
setInterval(sensor.trigger, 350);