Espruino Espruino JavaScript for Things JavaScript for Things Niko Köbler ( ) @dasniko {JavaScript}Training

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JavaScript JavaScript as the as the Language Language of the of the Web! Web!

Write once, Write once, run everywhere! run everywhere! It is already used everywhere!

Clients Clients Desktops, Laptops, Smartphones, Tablets, TVs, etc.

Servers Servers etc.

Microcontollers & USB-Sticks And now: And now:

Espruino Project Espruino Project Founder: Gordon Williams ( ), UK @espruino www.espruino.com Open Source Hardware (CC-BY-SA) Open Source Software (MPLv2)

Crowdfunded on Kickstarter! Crowdfunded on Kickstarter! Espruino Espruino Goal: 20k GBP, Pledged: 100k GBP by 1.692 backers in September 2013 Pico Pico Goal: 15k GBP, Pledged: 75k GBP by 1.448 backers in November 2014

The Board The Board 54 x 41 mm (half of business card!) STM32F1 chip family

The STM32 Chip The STM32 Chip STM32F103RCT6 32-bit, 72MHz 256kB Flash Memory 48kB RAM Only 1 Chip, therefore less power consumption! (this is kind of "green IT")

GPIOs GPIOs

Board-Features Board-Features Battery Connector Micro-USB Connector SD-Card Slot Bluetooth Pads Prototyping-Area 2 Buttons, 3 LEDs

The Pico The Pico STM32F401C chip, 384kB Flash, 96kB RAM less (22) GPIOs than Espruino Board USB powered

The Interpreter The Interpreter Because JavaScript is interpreted, the code can be changed while it is running! You don't have to compile/install anything anymore. No deployment-cycles, faster delivery! Instant feedback on every code/function execution: good (ok) / bad (error)

Event-based Model Event-based Model Evented I/O like Node.js, Vert.x, Play, Akka and other popular approaches. (even NPM modules can be used!) More interactive and understandable, because it's the way people naturally describe tasks: "When it's dark, turn on the light." Code is only processed on events and if necessary, this saves energy!

Power Saving Power Saving The interpreter knows when it can go to sleep, and how deeply. Even the WiFi module doesn't need power while sleeping! Example: Example: LED-flashing with a 700mAh Li-Ion battery: Raspberry PI: 1 - 2 hours Arduino: 1 - 2 days Espruino: ~6 months

Documentation Documentation www.espruino.com 1. 2. 3. Reference Modules Tutorials

Getting Startet Getting Startet http://www.espruino.com/Quick+Start

Web IDE (Chrome App) Web IDE (Chrome App)

Example 1: Toggle LED Example 1: Toggle LED digitalWrite(LED1,1); digitalWrite(LED1,0); function toggle() { on = !on; digitalWrite(LED1, on); }; toggle(); var interval = setInterval(toggle, 500); clearInterval(interval);

Example 2: Example 2: Switch LEDs with Button Switch LEDs with Button LED1.set(); LED1.reset(); setWatch(function () { LED1.set(); setTimeout("LED1.reset(); LED2.set();", 500); setTimeout("LED2.reset(); LED3.set();", 1000); setTimeout("LED3.reset()", 1500); }, BTN, { repeat : true, edge : "rising" }); Video: http://youtu.be/Ts8K07VhzIM

Create HTTP server via Wifi module and test on startup if wireless connection can be established. Example 3: HTTP-Server Example 3: HTTP-Server var wlan = require("CC3000").connect(); var http = require("http"); wlan.connect("mySSID", "mySecret", function (s) { if (s == "dhcp") { console.log("My IP is " + wlan.getIP().ip); http.get("http://www.pur3.co.uk/hello.txt", function(res) { res.on('data', function(data) { console.log(">" + data); }); }); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.write('Hello World'); res.end(); }).listen(80); } }); (CC3000)

Where to next? Where to next?

Sensor Networks Sensor Networks small form-factor low energy consumption (needs energy only when doing something, not while sleeping) MQTT + socket support HTTP support already built-in!

USB HID support USB HID support Allowing Espruino (Pico) to act like a USB keyboard, mouse or joystick. Make your own input devices for you PC, or make Espruino "play back" a series of keypresses. http://forum.espruino.com/conversations/127079/

"Programming" with Audio "Programming" with Audio http://forum.espruino.com/conversations/257732/

TV-Output TV-Output http://forum.espruino.com/conversations/259768/

Thank you! Thank you! Questions? Questions? Contact: Contact: @dasniko @dasniko Slides: http://slides.com/dasniko/espruino