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bruno_rzn

15 karma · joined December 27, 2017

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bruno_rzn··on Ask HN: What are you working on? (May 2025)
Thanks a lot!

Yes, the first idea that came to mind (after music/light controllers) was indeed car user interfaces.

Maybe some cool interfaces for home automation too, and I can also imagine controllers for factories or workshops—pretty much anywhere with lots of parameters to control.

But really, if you have other scenarios in mind, please share, I’m very interested, as you can imagine ;)

bruno_rzn··on Ask HN: What are you working on? (May 2025)
I’m working on Karl [https://www.veloursdevices.com], a MIDI controller. It’s quite unique because it features 32 encoders over a display, which allows you to have a fully customizable interface—like a touchscreen, but with actual knobs you can touch.

I have a software engineering background, and I’ve been working on this for nearly 3 years now! I used to play with the Electra One controller before, but having the encoders over the display is really something I’ve always wanted.

I presented Karl last month at Superbooth (a fair in Berlin) and got really good feedback. After 6 months of beta and 2 years of touring with it myself, the first batch will be dispatched in August, and this is quite exciting!

bruno_rzn··on Ask HN: Most interesting tech you built for just yourself?
I'm building a MIDI controller that has knobs (rotary encoders) displayed on top of a full hd display. I looked everywhere for something similar and I'm pretty sure that it does not exist. Did my first gig with the first prototype. It's basically a mix between the Electra One, the MP Midi Controller and the Stream Deck.

I'm working on this for months now, and I had to learn how to use tools like Fusion 360 and Kicad for this, which is incredibly fun!

I'm looking for a name for this product, current propositions are "a screen with holes" and "écran total" but ideas are welcome :)

bruno_rzn··on Ask HN: Can a tautology be serious?
Thank you again for this answer.

What I really don't understand here is the transition between :

1 - You can read Kaya's identity as per capita CO2 emissions from human sources is equal to per capita GDP times energy use per GDP unit times CO2 emissions per energy unit production.

and

2 - So, you have three ways of reducing per capita CO2 emissions...

What is the logic behind this ? I mean, if you pose [ CO2 = CO2/pop * pop ] (simplified, but indeed always true by definition), how can you say that one way of reducing the CO2 emissions is reducing the [pop] term ?

I don't know if I'm clear enough...

bruno_rzn··on Ask HN: Can a tautology be serious?
Could you generalize to other identities ?

Or, on the contrary, give an example of such equation with some actual empirical value ?

bruno_rzn··on Ask HN: How will the GDPR law handle tracking cookies?
Thanks a lot. Very interesting link.

Same question: this iFrame would be used to store information related to the user across websites, it kind of works like a cross-domain-cookie-replacement : could GDPR make these kind of tooling illegal ? Should we display a very specific popup to tell the user what those scripts really do ? And have an opt-out option ?

bruno_rzn··on Ask HN: How will the GDPR law handle tracking cookies?
I mean, since most of Tag Managers solutions let 3rd Parties set cookies, ads companies such as Criteo (for instance) must use them to trace users across several websites, no ?

What kind of other solution do you think about ?