Ductapemaster

11 часов назадdiscuss

This is cool! I have recently been building a "life admin" system that is focused around keeping track of bills and insurance reimbursements, and I am currently extending it to support a recipe database. My data model is markdown + CSV, but it has reached a point where a real database would be helpful. I'll check this out as it may be a good migration. Thanks for sharing.

Ductapemaster

2 месяца назадdiscuss

In simple terms, this works by doing an XOR on the outputs and if they disagree, performing a fault recovery.

There's also space systems that use 3 processors and a majority vote for the correct output, but that's different.

Ductapemaster

10 месяцев назадdiscuss

It's not about the whole microcontroller having less than 64kB of memory - it's that each WASM module has a minimum memory size of 64kB, regardless of how much it actually requires. Also, if you need 65kB of memory, you now have to reserve 2 pages, meaning your app now needs 128kB of memory!

We're working on WASM for embedded over at atym.io if you're interested.

Ductapemaster

12 месяцев назадdiscuss

I use this app on all my Macbooks — it's great!

Ductapemaster

12 месяцев назадdiscuss

I've always wanted a Shaper Origin, but the cost and subscription fee required for accessing some features always turned me off. I don't need it for anything other than fun hobby projects and couldn't justify it. Now I get double the fun: building a tool, and getting to use it! Nice work.

Ductapemaster

12 месяцев назадdiscuss

Sadly, Useful Sensors seems to have pivoted to other edge AI tech and no longer sells this or their person detector.

Ductapemaster

12 месяцев назадdiscuss

I spent a LOT of time on this website as a 90's kid. One of many that inspired me to get an EE degree. Projects like this always felt like some incredible magic, and came with an artistic aesthetic that I find inescapably captivating. We've instead got little bits of black epoxy everywhere these days and it's just not the same!

Ductapemaster

в прошлом годуdiscuss

Thank you (and the GP) for the correction! I'll admit this lesson came to me a decade ago and I am speaking to a rule of thumb I developed as a result. Time to update my knowledge banks.

Ductapemaster

в прошлом годуdiscuss

On your note about capacitor sizes — at my first EE job, my boss taught me about capacitance-voltage derating[0] for ceramic capacitors and it was quite the revelation. There is a significant inverse relationship between the two, which no one tells you about in college!

I'm now very careful to pick ceramic capacitors with enough headroom on their rated voltage as you lose a lot if you're close to the rated value. This curve is dependent on the different ceramic types as well (C0G, X7R, etc). Cheaper ceramics have a steeper rolloff.

For personal projects I am very careful to pick higher quality ceramics (X7R if I can) and use caps rated to 2-3x my operating voltage. Likely overkill, but I'm not optimizing for cost at volume.

[0] https://resources.altium.com/p/voltage-derating-ceramic-capa...

Ductapemaster

2 года назадdiscuss

I live in Alameda and this place is such a local gem. The owners are really genuine people too. Great place to spend some time!

They also own a whole warehouse out at Alameda Point filled with machines. I know they have provided some form of access to the public in the past, but I'm not sure what that looks like today.

Ductapemaster

2 года назадdiscuss

As a former Fit owner, I wish I had thought of this! The AC was really bad. We did a lot of road trips and it really struggled out on the long desert highway stretches.

Ductapemaster

2 года назадdiscuss

Just op-amps and FETs for the active components. The design from my memory was:

- To get position, 2 integrators were applied to an adjustable voltage representing gravity.

- The FETs were used to set initial states of the integrators.

- A comparator used to detect the table (y=0), flip the velocity and apply a scaling factor for restitution

The math was actually quite simple given its just the standard velocity equations — the challenge was in handling state changes in the electronics.

I looked around a little more and this video is a very close replica of what we built: https://www.youtube.com/watch?v=qt6RVrmvh-o

Ductapemaster

2 года назадdiscuss

In my upper-division analog electronics class (the hard one), our lab project throughout the quarter was to build an analog computer that simulated the physics of a bouncing ball. Physical variables of the system were adjustable (gravity constant, coefficient of restitution, etc), and the ball was "released" by pressing a button. The output was viewed on an oscilloscope.

One of the hardest 10 weeks of my life, but also one of the most rewarding. Our team was one of the few that actually got it working in the end. I had to custom-make a gigantic breadboard to hold the entire circuit.

Today I still work in hardware, but mostly with digital circuits. While my analog knowledge has decayed over the last decade, that project and it's success gives me great confidence any time I have to deal with the domain.

If you want to take a look, here's a pretty similar project: https://www.analogmuseum.org/english/examples/bouncing_ball_...

Ductapemaster

2 года назадdiscuss

That's really interesting. For me, I very much do NOT enjoy the taste of truffles in restaurant dishes because it's often so overbearing. I just don't find the flavor interesting, and it's very singular.

Perhaps I would enjoy the "real" experience more...

Ductapemaster

2 года назадdiscuss

This is a great resource for why Starship is groundbreaking. So much so, it’s not even really comprehensive to the existing space-industrial complex.

https://caseyhandmer.wordpress.com/2021/10/28/starship-is-st...

Ductapemaster

2 года назадdiscuss

Check out this talk: https://www.youtube.com/watch?v=dF_9YcehCZo

The source code isn't hiding in a repo somewhere for security reasons — it's spread around on various pieces of paper and computers over the last 50 years. There isn't a single source of truth. Adds a whole other level of wizardry to keeping the thing running.

Ductapemaster

2 года назадdiscuss

It's not quite that simple: https://carnegiemuseums.org/magazine-archive/1997/mayjun/dep...

However, one misnomer remains true — a Strawberry isn't actually a 'berry'.

Ductapemaster

2 года назадdiscuss

Awesome!

That is a vastly more complex machine and action than I was expecting. Seems like there is more to the process than just flipping it over.

Ductapemaster

2 года назадdiscuss

Unfortunately since it’s an active feature it requires power, meaning any wired headset will require a battery or other power source.

A wired headset plus my mixer gives me an opportunity to tinker and upgrade my setup as I wish, and is all USB powered to boot.

I have some rough plans to make a simple audio interface with built in sidetone for use as a portable setup, but haven’t had the time to turn it into a real product. Someday!

Ductapemaster

2 года назадdiscuss

It really does surprise me too.

Myself and my team are all technical sales folks with engineering backgrounds, and we naturally optimize for this sort of thing — all of us have some form of “advanced” setup that’s been informed by each other’s investment.

On the other side, NONE of our account reps have anything remotely close. I can think of one or two times in the past few years when someone asked me about what tech I use. My company even has a home office budget benefit meant for exactly this sort of thing!

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