Viewing profile — chipweinberger

The app is not required if you access the midi files from the sd card. You don't even need to install it. The app is optional, and its for browsing your library. Think of it like t…

Counterfeit != clone. I welcome competitors. They can help grow the pie.

If you consume power over USB-C, 2 resistor are enough. But for providing power over USB-C, you generally need a dedicated IC to handle VBUS switching. It wasn't worth it. Also, on…

I appreciate the critiques! First, so far, there have been 0 failures in the field. My email address is on the website, the app, and the first page of the instruction sheet, so I'd…

500 units was my first run, and it worked out really well. None of the suppliers complained about that order size. I recommend starting with a smaller quantity until you've validat…

The device does not require the app. It still records MIDI 24/7 to sdcard. It's more the opposite. The app requires a genuine device.

Will do a write up on injection molding and anti-counterfeit!

Not technically custom, but made to order (I gave them a spec sheet). If they had reasonably priced connectors on LCSC or DigiKey, etc, I would have used them!

The marketing answer: all lower-case looks modern and opinionated The real answer: I got tired of deciding what should and shouldn't be capitalized. Sounds easy but it gets ambiguo…

I don't entirely disagree. Just one sample point. But there are certainly much more simplistic hardware products out there. I'm often envious of them. Here's a good example: https:…

Yes the anti-counterfeit is primarily app enforced (though entirely offline). I do use the firmware encryption features of the ESP32-S3, whatever that is worth, and the firmware is…

Ahah good eye. It was only 4 blocks down the road! I too was surprised by how well a single cord worked to balance the 45lb boxes.

Android too! Built with Flutter. Flutter is great highly recommend it.

This is very flattering. Thank you.

3 main components: flashing, provisioning keys, hardware testing. Nearly every component gets tested: sdcard, clock, battery, anti-counterfeit IC, led, buzzer, the tactile-switch!

Yes I've seen a few people mention that! All of the best MIDI hardware recorders are ancient, for whatever reason. Well, apart from Jamcorder ;)

It sort of is. I'm at an annoying scale where most 3PLs don't want to deal with me yet. At the same time, it doesn't take much time at all, and is a good excuse to get out of the h…

I started with having watched ~100 hours of EEVBlog :) Electronics, PCBs, CAD, injection molding was all new to me.

They should just work! You can replace the soundfont that the app uses with your own too.

IMO it's better to ship preprogrammed ICs to the factory, so you can do your secure burning in-house.

These numbers do not include ESP-IDF :)

I chose to do FCC only and CE self-certify. If you use pre-certified radios it's not as expensive as you think. $5K should be plenty if you ask around. Just make sure you design yo…

I'm using an STSAFE chip - the same IC they use in StarLink terminals. Essentially the digital equivalent of a holographic barcode. I have some other protections too. e.g. Random 1…

The app is about 85K lines: device connectivity, first-time setup, syncing, MIDI playback and visualization, library management, audio/video export, and OTA workflows. The firmware…

Spending too long on the firmware. I almost ran out of runway. I should have cut features faster. And I should have built the firmware cross platform so I could run it my local mac…