javier_cardona

I lost access to the slides half way through reading them... Too bad! I was enjoying the presentation! (“Rust makes me feel guilty” :)

EDIT: Never mind. Access came back. Good slides!

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.

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-...

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.

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!

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...

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....

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)

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

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....

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.

The sounds are synthed sounds (I used fluidsynth) and the haxophone just uses the sound pressure to infer velocity of the notes.

The mouthpiece is optional: you can blow on the neck of the device and will get the exact same sound. But as a sax player, I really prefer to use it with a mouthpiece blowing through it but without making the reed vibrate (so no sound). I find that it helps me maintain proper embouchure and feels more comfortable. And after a solid practice session, I still get that gratifying tingling lower lip feeling.

Thanks for the feedback!

https://github.com/jcard0na/haxo-hw/blob/main/docs/assembly....

A preprint of the paper mentioned in the post is available here: https://www.researchgate.net/publication/347609399_Mechanica...

SEEKING FREELANCER - San Francisco, CA. Remote OK

We are looking for help to layout our prototype printed circuit boards (PCBs). Requirements:

- Experience laying out multi-layer PCBs, with RF (cellular), audio and other digital signals (SPI, USB, I2C, …).

- Worked on boards from concept to production.

- Experience creating and managing footprints for Kicad.

- Experience working with multiple PCB fabrication houses and diverse design rules.

- Experience troubleshooting prototypes, implementing reworks.

- Capturing and documenting layout decisions to the team.

- Familiarity with git for version control.

- Familiarity with Kicad Stepup would be a bonus!

We could use little or a lot of help, depending on your availability and interest.

Please contact us at founders@okio.io, Subject: Kicad Layout Engineer Freelancer, and include some examples of your work (Gerbers, PDF and/or photos of boards you laid out).

SEEKING FREELANCER - San Francisco, CA. Remote OK

We are looking for help to layout our prototype printed circuit boards (PCBs). Requirements:

- Experience laying out multi-layer PCBs, with RF (cellular), audio and other digital signals (SPI, USB, I2C, …).

- Worked on boards from concept to production.

- Experience creating and managing footprints for Kicad.

- Experience working with multiple PCB fabrication houses and diverse design rules.

- Experience troubleshooting prototypes, implementing reworks.

- Capturing and documenting layout decisions to the team.

- Familiarity with git for version control.

- Familiarity with Kicad Stepup would be a bonus!

We could use little or a lot of help, depending on your availability and interest.

Please contact us at founders@okio.io, Subject: Kicad Layout Engineer Freelancer, and include some examples of your work (Gerbers, PDF and/or photos of boards you laid out).