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June 9, 2015
Building a drone safe for humans

Let's build a drone safe for humans ! Here is an early concept for @gofleye, same size and weight as a soccer ball.

February 4, 2014
My laptop... post @fosdem :-)
December 24, 2013

Printing backup gears for my Printerbot Junior.

December 15, 2013
3D printing ornaments for our Christmas tree

Our Christmas tree got a small kick of modernism this year with its first 3D printed ornament :-)

September 24, 2013
Finally a first proper 3D printed object

After days of tweaking and callibration, I've finally managed to print this handy Mr Jaws to ensure my coffee stays fresh :-)


The infill is far from perfect... more tuning ahead.

High-tech cuisine
August 21, 2013
First 3D Print!!

Three days ago, all I had was a lot of wooden pieces, nuts and bolts. Today I have a 3D printer with 100micron precision and this is my first print. There is nothing fancy here, just assembled a Printrbot JR as part of a 3 days workshop organized by Re-Lab. But for me it was a first and a really fun experience mixing hardware, mechanical engineering, electronics and software. Building your own tool and then printing your own parts provides a very satisfying experience.


Now, I'm far from done, there is a lot more tuning to do before I can start printing quality parts, but it is a start and a lot of fun.

August 20, 2013
It starts looking like something

Another day of fun work and the printrbot is coming along quite well. Should start printing tomorrow, I'm looking forward to it!

August 19, 2013
Assembling the extruder

Ending the day by assembling the extruder. Another sandwich to add, some circuit board soldering, and we should be printing by end of day tomorrow. Assembling your own printrbot is a lot of fun!


Thanks @greoli for the pics

Playing with extreme technology...

Wood, nuts and bolts :-) A long way to go before a finished product!


Thanks @greoli for the picture

June 17, 2013
Proportional control of a #nodecopter

I continue my work on attempting to controll the nodecopter using a PID controller. The first results are really encouraging. On this plot, you can see the drone moving forward of 1 meter, from (0,0) to (1,0). The oscillation is due to the speed inertia and you can see the controller successfully bringing the drone to the correct position.


The red line is the position along the x axis. The green line is the drone velocity.


Next step is to fine tune the various parameters to find a balance between the oscillations and convergence speed.

June 11, 2013
Pose estimation of a #nodecopter with an Extended Kalman Filter

A few weeks ago, I posted my first attempt at estimating the pose of the ARDrone based on integrating the odometry measure. It was a good start but definitively lacked precision.


Thus, the next step has been to implement an Extended Kalman Filter that use a tag detected by the bottom camera (at the landing zone) for correcting the state prediction.


This picture shows the result running the same flight through both a simple estimator and the EKF with correction step. As you can see, in the later, the drone actually lands where it took off. You can also see some subtle corrections as the drone fly by the tag.


All this code is available here and remains quite experimental.

June 7, 2013
June 3, 2013
First attempt at estimating the state of an AR Drone

This is my first attempt at estimating the position of an ARDrone by integrating the motion data through time. You can kinda see I have been flying two square patterns.


There is a lot of noise obviously (both sensors and wind) which are the cause of this not so precise tracking. Next step is to integrate observations derived from the camera into a proper Extended Kalman Filter. That's the tricky part :-)

May 27, 2013
Added a battery widget to ARDrone WebFlight...

Spent the evening adding this little widget to ARDrone WebFlight. Rendered in a html5 canvas. Always good to know how much battery you have left when flying this little beast :-)

May 26, 2013
Raining outside, so I'm experimenting inside with face tracking in WebFlight...
May 10, 2013
Nouveau luminaire dans le hall de nuit

Et en plus c'est "made in Liège". Celà vient de chez re-store, en Neuvice. 

Nouveau luminaire dans la cuisine

Perfect for the low ceiling in the kitchen. Made in Liège at the Re-Store.

April 22, 2013
Having a federated conversation across the #indieweb

The commenters on this post have done so from their own site, in an #indieweb spirit, and notifying my site via pingbacks. This enable a true, federated, two-way conversation in the open web.


No silos, no paywall, no control by a single entity or government. Pure freedom, at least as pure as emailing or calling someone.


I love it :) When are you joining the conversation ?


Featured in this picture are, and

March 14, 2013
February 16, 2013
February 3, 2013
January 6, 2013
Geekiest gadget in the house...

For those wondering... this is indeed an energery meter. Works like a charm, we've already learned a lot on our energy consumption patterns.

December 15, 2012
normann - copenhagen

Wrapping up the year by adding yet another fixture, this time in the bathroom.

April 8, 2012
March 21, 2012
February 10, 2012
February 9, 2012
February 5, 2012
January 22, 2012
September 24, 2011

Slowly adding lights in the house, this time not a fancy designer, just a gorgeous one from IKEA. Note however it took me a couple hours to assemble it.

August 6, 2011

Our new fixture in the living room: a Zettel chandelier by Ingo Maurer

July 10, 2011
Bloom by Kartell

Just installed a new fixture in the entrance. Bloom by Kartell. Took me about 3 hours to assemble this one. Flashy !

April 17, 2011
April 6, 2011
January 6, 2011
Insanely awesome solar eclipse picture with the ISS

"the ISS was in front of the Sun for less than second, so not only did he have one chance at getting this spectacular once-in-a-lifetime shot, but he had only a fraction of a second to snap it!"


via Discover Magazine


December 19, 2010
October 25, 2010
September 29, 2009
Group photo :-)

typical country side...

July 24, 2009
July 12, 2009
Ciel bleu et ambiance vacance au bar des #ardentes. Cold War Kid comme bande son.
On commence les choses serieuses avec Alela Diane aux #ardentes. Dehors, ciel bleu et beau soleil !
July 8, 2009
No hamburgers in Dusseldorf... instead they have Schnitzel Huber which is.. yes.. a schnitzel fast-food !


mark Gravtar
on 8 Jul 09 at 13:02 CEST
we have a McDonalds :)
June 18, 2009
Stop hating on IE6! You'll hurt its feelings! (via @thenextweb)


loïc Gravtar
on 18 Jun 09 at 9:00 CEST
a little inspiration from Shaddock style
June 13, 2009
Mariage dans une sympathique ferme du brabant
May 29, 2009
Back to the airport... first class :-)
7 years later... a real sizzling chicken fajita ! Well deserved :-)
May 28, 2009
Chillout at #io2009... geek style ;-) #webmission
Having a chat with Vic Gundotra, VP of Engineering, really nice guy !