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==========
 Espruino
==========

--------------------------------
 Javascript su microcontrollore
--------------------------------

Chi sono
--------

Elena “of Valhalla” Grandi

* Nella comunità del Software Libero dal ~2000
* Debian Contributor
* Usa arduino dal ~2010
* Appassionata di Hardware Libero

Gruppo Linux Como
-----------------

.. image:: img/logo.pdf
   :align: center

http://www.gl-como.it

Incontri aperti al pubblico in Como tutti i giovedì sera 

Cos'è Espruino
--------------

* Famiglia di schede a microcontrollore
* Interprete javascript per microcontrollori
* IDE integrata nel browser
* Comunità: http://forum.espruino.com/
* Open Hardware e Free Software

Free Software
-------------

.. image:: img/floss.pdf
   :align: center

Open Hardware
-------------

.. image:: img/oshw-logo-400-px.png
   :align: center

Famiglia di schede: espruino ed espruino pico
---------------------------------------------

.. image:: img/all2.jpg
   :align: center

http://www.espruino.com/press/

Famiglia di schede: puck.js
---------------------------

.. image:: img/parts_side.jpg
   :align: center

http://www.espruino.com/press/

Interprete javascript
---------------------

* ~ 95% compatibile con javascript “normale”
* su schede a partire da 128kB Flash 8kB RAM
* microcontrollori 32 bit:

  - ARM Cortex-M3
  - ARM Cortex-M4
  - ESP8266

Su altre schede
---------------

.. image:: img/other_boards.png
   :align: center

Rispetto ad Arduino?
--------------------

   * Consumi minimi (di default)
   * Esplorazione interattiva
   * Facilità di scrittura di task paralleli
   * Linguaggio versatile

Applicazione per Chrom(e|ium)
-----------------------------

http://www.espruino.com/Web+IDE
https://chrome.google.com/webstore/detail/espruino-web-ide/bleoifhkdalbjfbobjackfdifdneehpo

IDE
---

.. image:: img/web_ide.png
   :align: center

Uso interattivo
---------------

.. image:: img/interactive_led.png
   :align: center

IDE a blocchi
-------------

.. image:: img/blink_block.png
   :align: center

Blink, seconda versione
-----------------------

.. image:: img/blink_text.png
   :align: center

------

.. code:: javascript

   var on = false;
   setInterval(function() {
     on = !on;
     LED1.write(on);
   }, 500);

Bottoni
-------

.. image:: img/button.png
   :align: center

------

.. code:: javascript

   var on = false;
   var change = function() {
     on = !on;
     LED1.write(on);
     };

   setWatch(change, BTN1, {repeat:true, edge:"rising"});

DHT22
-----

.. image:: img/dht22.png
   :align: center

------

.. code:: javascript

   var dht = require("DHT22").connect(C11);

   dht.read(function (data) {
     console.log(
       "Temp is " +
       data.temp.toString() +
       " and RH is " +
       data.rh.toString());
   });

OLED
----

.. image:: img/display.png
   :align: center

------

.. code:: javascript

   function start() {
     g.drawString("Hello World!",2,2);
     g.flip();
   }

   I2C1.setup({scl:B6,sda:B7});
   var g = require("SH1106").connect(I2C1, start);

Saving and loading
------------------

.. image:: img/display_interrupt.png
   :align: center

------

.. code:: javascript

   function draw_screen(data) {
     console.log("Drawing the screen with data");
     console.log(data);
     g.drawString("Espruino demo", 2, 2);
     if (data) {
       g.drawString("Temp: "+data.temp.toString(),2,10);
       g.drawString("  RH: "+data.rh.toString(),2,18);
     }
     g.flip();
   }

------

.. code:: javascript

   function start() {
     dht = require("DHT22").connect(C11);
     I2C1.setup({scl:B6,sda:B7});
     g = require("SH1106").connect(I2C1, draw_screen);
   }

   E.on('init', start);

   start();

Reading with a button
---------------------

.. image:: img/temp_with_button.png
   :align: center

------

.. code:: javascript

   setWatch(function(e) {
     dht.read(draw_screen);
   }, BTN, { repeat: true, edge: 'rising' });

Lowering contrast
-----------------

.. image:: img/contast_with_button.png
   :align: center

------

.. code:: javascript

   setWatch(function(e) {
     g.setContrast(255);
     dht.read(draw_screen);
     setTimeout(function () {
       g.setContrast(1);
     }, 4000);
   }, BTN, { repeat: true, edge: 'rising' });

Setting the date
----------------

.. image:: img/set_date.png
   :align: center

Logging data
------------

.. image:: img/logging_data.png
   :align: center

------

.. code:: javascript


   function start() {
     [...]
     fs = require("fs");
   }

   setInterval(function() {
     dht.read(function(data) {
       entry = "- {time: " +
       Date.now() +
       ", temp: " +
       data.temp.toString() +
       ", rh: " +
       data.rh.toString();
       console.log("saving: " + entry);
       fs.appendFileSync("temp_rh.yaml", entry);
     });
   }, 60000);

Per proseguire
--------------

.. image:: img/tutorials_page.png
   :align: center

Ulteriore documentazione
------------------------

* http://www.espruino.com/Reference
* http://www.espruino.com/Modules
* Queste slide: http://git.trueelena.org/cgit.cgi/docs/presentazione_espruino/

Domande?
--------

Ci trovate allo stand del Gruppo Linux Como nel padiglione C

.. image:: img/800px-Drinking_Cat.jpg
   :align: center

https://commons.wikimedia.org/wiki/File:Drinking_Cat.jpg