Viewing profile — javier_cardona

Conceived to put an end to petty online debates that consume too much time and energy.

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 slid…

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 a…

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 gende…

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 ener…

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…

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: …

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 nec…

I built this during Covid. When I released it, some of the parts went out of stock or skyrocketed in price, no longer making this an economic DIY project. Now that things are getti…

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 P…

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 P…