javier_cardona's comments

On: Trading cards with e-ink displays (2023)

[javier_cardona]

For those interested in novel and quirky uses of e-ink displays, you might also want to see these: https://lightnote.cardonabits.com

Disclaimer: I design and build these. And I'm also a big fan of jonahss work.

[jonahss → javier_cardona]

The lightnote is so cool, and the design is perfection

On: Static Chess

[javier_cardona]

Pawn promotion is set to queen. You might want to add support for other promotions... https://www.chess.com/forum/view/game-showcase/checkmate-by-...

[daniel_levine → javier_cardona]

Fork it!

On: Dada, an experimental new programming language

[javier_cardona]

Just for context, the quoted manifesto was originally written in French (https://monoskop.org/images/3/3b/Dada_3_Dec_1918.pdf). In that version, that particular sentence is gender neutral: "tout le monde fait son art a sa façon".

I would say that that their updated quote is a more accurate translation of the original than the English translation they initially used.

[sorenjan → javier_cardona]

That does make it a lot better, but at the same time makes the footnote even more of a deliberate statement that could have been left out.

[gr4vityWall → sorenjan]

> That does make it a lot better

Why?

On: Haxophone crowdfunding campaign has launched

[javier_cardona]

After warm encouragement from this community (the Show HN post made it to #1 for a day!) I've decided to launch a crowdfunding campaign for fully-assembled haxophones. Wish me luck!

On: Battery-free Game Boy (2020)

[javier_cardona]

Getting the electronics to work on such a tight energy budget is a big challenge, very impressive! I've worked on a similar concept using a bistable display and a supercap for energy storage to recharge very quickly when sun is available. This is for more zen-like use cases, like chess puzzles: https://lightnote.cardonabits.com/products/lightnote-chess-e...

On: Show HN: Haxophone

[javier_cardona]

No the reed does not vibrate. It's there to restrict the airflow and to provide a similar embouchure to a real sax. Some more details here: https://github.com/jcard0na/haxo-hw/blob/main/docs/assembly....

On: Show HN: Haxophone

[javier_cardona]

It's running vanilla Raspberry Pi OS, alsa drivers and fluidsynth, all configured from the main Rust application (https://github.com/jcard0na/haxo-rs/blob/main/src/synth.rs)

On: Show HN: Haxophone

[javier_cardona]

FWIW, I just tried it on iPhone and works for me...

On: Show HN: Haxophone

[javier_cardona]

Actually the pressure sensor is on the PCB. Pressure is transferred from the mouthpiece through a flexible silicon pipe. You can see the details in the assembly instructions here: https://github.com/jcard0na/haxo-hw/blob/main/docs/assembly....

On: Show HN: Haxophone

[javier_cardona]

Yes, there is no analog touch sensitivity on the sax: keys are either open or closed. The pressure sensor is for volume and note attack.

[junon → javier_cardona]

There exist analog keyswitches, have you considered playing with those?

[jcard0na → junon]

While it would be interesting to play with analog keyswitches, it would depart from the experience of a real sax, where the "half pressed" key is of not much use. And it would dramatically increase the complexity of the design.

But the full design is published, just in case anyone wants to try :)

[mkl → junon]

I'm really interested in this idea for other DIY instrument purposes.

Razer has keyboards with optical ones, and some people have made them by putting inductive sensors underneath mechanical switches, but I couldn't find any analog keyswitches for sale. Do you have some examples?

How can you deal with a large number of analog inputs to a Raspberry Pi or similar?

[junon → mkl]

I don't remember how many analog input pins exist but a separate circuit that digitizes many analog inputs to a serial stream would be how I'd do it, personally.