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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
|
