digital-twins-webthings-iotjs-20190512rzr

Samsung Open Source Group
1
https://social.samsunginter.net/@rzr
WebThings in VR
…towards ”DigitalTwins”
#GrafikLabor, Rennes, France <2019-05-12>
https://afgral.org/grafiklabor-2019
Philippe Coval
Samsung Open Source Group / SRUK
pcoval@samsung.com

2
$ who is Philippe Coval
●
Software engineer for Samsung OSG
– Belongs to SRUK team, based in Rennes, France
– Interest: Web of Things with “Privacy by Design”
●
Some past 3D experiences (OpenGL, VRML, ArtoolKit+, etc)
●
After FOSDEM 2019, I was inspired to blend IoT and XR
●
Join the fediverse: https://social.samsunginter.net/@rzr

3
Immersive Web

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Immersive Web
●
A successful evolution: 3D, VR, AR, XR
– HTML5, WebGL, Three.js, WebVR, OpenVR, OpenXR and WebXR !
●
Several FLOSS frameworks:
– Three.js: High-level library on top on WebGL with WebVR support (for devices)
– A-Frame: Originally from Mozilla, HTML for VR (built on Three.js)
– Babylon.js: from MS and more ...
●
Support: most desktop Web Browsers and VR browsers (for headsets)
– I use GearVR2017 (with controller)
●
Runs SamungInternet for VR (chromium based)

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A-Frame’s static scene in DOM
<script src="https://aframe.io/releases/0.9.0/aframe.min.js">
</script>
<a-scene>
<a-box
color='blue' rotation="0 42 0">
</a-box>
<a-camera position="1 1 3">
</a-camera>
</a-scene>

6
A-Frame’s static scene in DOM
<script src="https://aframe.io/releases/0.9.0/aframe.min.js">
</script>
<a-scene>
<a-box id='foo’
color='blue' rotation="0 42 0">
</a-box>
<a-camera position="1 1 3">
</a-camera>
</a-scene>
<script>
var el = document.getElementById("foo");
el.setAttribute("color", "red"); // via DOM API
el.object3D.rotateY(43); // via Three.js API
</script>

7
A-Frame components
<script>
AFRAME.registerComponent('motor', {
schema: {
angle: { type: 'number', default: 0},
}, init: function() {
this.child = document.createElement('a-box');
this.child.setAttribute('color', ‘green’);
this.el.appendChild(this.child);
}, update: function(old) {
var angle = Number(this.data.angle);
this.child.object3D.rotation.set(0, Number(this.data.angle), 0);
}
});
</script>
<a-scene>
<a-entity motor="angle: 45"></a-entity>
<a-camera position="1 1 3"></a-camera>
</a-scene>

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WebThings

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Mozilla WebThing Project
●
An open platform for monitoring and controlling devices over the web.
– With “Privacy by Design” (data stay home)
●
Inspired by Web of Things works (Web Tech for IoT)
– RESTful API, Schema, Data model (JSON)
– Proposed to W3C
●
Implemented in Mozilla’s WebThings gateway
– To connect and connect webthings with “Privacy by Design” (data stay home)
– To be controlled from Web UI

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Webthings are standalone HTTP servers
●
Exposing Mozilla Things API (REST, JSON)
– Self described using Things schema
●
by properties which contains values:
– Example: a MotorThing has an AngleProperty of value 42
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Can be implemented for many runtimes (C, Python, Java, JS…):
– Physical objects
●
Internet access is not required (uses home network/LAN)
– Or services? can be deployed anywhere
●
on gateway as adapters: privacy matters!
●
on cloud as micro services?
– Eg: for development purpose try glitch.com

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Angle/Motor example simulator
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curl https://rzr-webthing-example.glitch.me/
{"name":"Angle" …
"properties":{"angle":{"title":"Angle","type":"number"…
"links":[{"rel":"property","href":"/properties/angle"…
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curl https://rzr-webthing-example.glitch.me/properties
{"angle":0}
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curl -X PUT -d '{"angle": 42}' https://rzr-webthing-example.glitch.me/properties/angle
{"angle": 42}

12
●
var webthing = require('webthing-iotjs');
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function AngleProperty(thing){
webthing.Property.call(this, thing, 'angle',
new webthing.Value(0), { type: 'number' });
}
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var thing = new webthing.Thing('Motor');
thing.addProperty(new AngleProperty(thing));
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var server = new webthing.WebThingServer(new webthing.SingleThing(thing),
8888);
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server.start();
Implementing a WebThing Actuator

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Deploy to micro controllers using IoT.js
●
IoT.js an alternative runtime inspired by Node.js:
– Powered by JerryScript engine optimized for micro-controllers
– Supporting JS modules: mastodon-lite, generic-sensors-lite
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WebThings can be built using webthing-iotjs module:
– Supporting IoT.js runtime:
●
OS: RT, NuttX, GNU/Linux …
●
MCU: ARTIK05X, STM32*
– Or use Node.js runtime:
●
for development/simulation (glitch)
– Note: webthing-iotjs is based on webthing-node

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●
SG90: 9g Micro Servo
– Angle: [-90°, +90°]
– I/O:
●
Power: 4.8V, GND
●
PWM Signal
Servo motors and PWM
●
Pulse Width Modulation (PWM):
– Constant frequency: 1/.02
– Variable duty cycle:
●
[1 ms = -90°, 2 ms = +90°]
●
(angle + 90 / 180) + 1
SG90

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●
Nucleo-F767ZI
– Nucleo-144 I/O
●
32.768 Khz
●
Ethernet
●
4 PWMs *
– STM32F7
●
ARM Cortex M7
●
RAM: 320KB
●
Supporting
– NuttX
●
* nuttx-7.29-115-gf06a2cabb5+
●
Origin of TizenRT
– TizenRT possible
– Arduino API
Micro Controller
PWM1.CH1_1 @PA8
(CN12: 12th
from top on right)
PWM2.CH1_1 @PA0
(CN10: 3th
from bottom on left)
PWM3.CH1_1 @PA6
(CN7: 6th
from top on right)
GND
PWM4.CH1_1 @PB6
(CN12: 9th
from top on left)

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Generating a PWM using IoT.js
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Example:
●
Note: dutyCycle [0, 1] adapt Row 1 Row 2 Row 3 Row 4
0
2
4
6
8
10
12
Column 1
Column 2
Column 3
var pwm = require('pwm');
var config =
{ pin: 0,
period: 20,
dutyCycle: 0.5}
var port = pwm.open(config,
function(err) {
port.setDutyCycle(0.42);
});

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From webthings…
to “Digital Twins”

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Updating XR view from webthing
●
function update(id, type, url) {
fetch(url)
.then( response => { return response.json(); } )
.then( json => {
for (var property of Object.keys(json)) {
document.getElementById(id).setAttribute(type, property, json[property]);
}})
.catch(function() { console.log('error: ') })
}
●
var url = 'https://rzr-webthing-example.glitch.me/'; // For simulator
// url = ‘http://webthinghost:8888’; // For device
update('foo’, 'motor', url + ‘/properties’);
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curl -X PUT -d '{ "angle": 5}' $url/properties/angle
<a-scene>
<a-entity id="foo" motor="angle: 45"></a-entity>
<a-camera position="1 1 3"></a-camera>
</a-scene>

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Digital Twins with WebThing-IoTjs (on MCU)
https://purl.org/rzr/digitaltwins-webthings-iotjs-20190512rzr

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Live control in 3D using A-Frame on GearVR:
https://youtu.be/s3r8pQtzhAU#wotxr-20190320rzr

21
https://social.samsunginter.net/@rzrSamsung Open Source Group
Q&A ?
(or Extras?)
Ask now or online:

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Controlling real devices / consuming OpenData
https://purl.org/rzr/webthing-iotjs-opendata-20190202rzr

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Social Web of Things demo (#MozFest)
https://purl.org/rzr/webthing-iotjs-20181027rzr

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References & Resources
●
Open Source:
– https://github.com/rzr/webthing-iotjs
– https://github.com/SamsungInternet/color-sensor-js
– https://github.com/samsunginternet/webthings-webapp
– https://github.com/pando-project/iotjs
– http://opensource.samsung.com/
– https://github.com/aframevr/aframe
– https://github.com/mozilla-iot/webthing-node
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Docs:
– https://github.com/rzr/webthing-iotjs/wiki
– https://github.com/rzr/webthing-iotjs/wiki/XR
– https://github.com/rzr/webthing-iotjs/wiki/Actuator
– https://github.com/rzr/webthing-iotjs/wiki/IotJs
– https://github.com/rzr/webthing-iotjs/wiki/MCU
– https://hacks.mozilla.org/2019/03/connecting-real-things-to-virtual-worlds-using-web/
●
Community:
– https://afgral.org/grafiklabor-2019
– https://social.samsunginter.net/@rzr
– https://hacks.mozilla.org/author/rzrusers-sf-net/

25
Thanks !
Resources:
Flaticons CC,
PixBay.com
https://Social.SamsungInter.net/@rzr

digital-twins-webthings-iotjs-20190512rzr

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