addaon

18 ms·

331.
by addaon 11mo ago
Laser safety glasses are off-the-shelf, but are usually tuned for a single band stop. There are at least three frequencies of near IR LiDAR in use in the wild.
332.
by addaon 11mo ago
While they’re taking one “end” much less literally than usual, they are taking the other “end” much more literally…
333.
by addaon 11mo ago
You can, and we did an extremely limited form of that — see other comment on reducing correlations. But you have an energy limit from eye safety concerns, so energy spent on spreading the signal over time and modulating it directly takes aw
334.
by addaon 11mo ago
Inductors are large, expensive, hot, and unreliable.
335.
by addaon 11mo ago
Yep. The state where the capacitor is fully floating relies on non-obvious details. Recall that a (real) transistor has a rated maximum voltage that it can block. But when the (ideal) transistors are opened, there's no defined voltage
336.
by addaon 11mo ago
A relevant part that changed my view of charge pumps is the LTC7820 [0]. This is an inductorless charge pump that can be used as a an unregulated voltage doubler or halver... at 500+ W and 98%+ efficiency. I used to think of charge pumps as
337.
by addaon 11mo ago
I've worked on or adjacent to one of the kernels you mention, and multiple RTOS's, across twenty years. The onboarding process has been the same as other non-OS software projects I've been involved in. I've never been in
338.
by addaon 11mo ago
A quick note about units -- you correctly quote the limits as an energy-per-pulse limit. The theory behind this is that pulses are short enough that rotation during a pulse is negligible, so they tend to hit a single point (on the retina, a
339.
by addaon 11mo ago
Yep, 200 m is pretty close to standard. Which is why 32 channel and 20 kHz is a pretty common design point. But customers would love 64 channel and 40 kHz, for example. Also, it's worth noting that if your design range is 200 m -- your
340.
by addaon 11mo ago
You can, but customers like compact self-contained units. All trade offs. Edit: There's basically three approaches to this problem that I'm aware of. Number one is to push the cross-talk below the noise floor -- your suggestion he
341.
by addaon 11mo ago
> There are two wavelengths of interest used Ouster uses (or at least used to use, not sure if they still do) 840 nm. Much higher quantum efficiency for standard silicon receivers, without having to play games with stressed silicon and s
342.
by addaon 11mo ago
Having built a LiDAR system for an autonomy company in the past, this is a great write-up, but it omits what I found to be one of the more interesting challenges. For our system (bistatic, discrete edge-emitting laser diodes and APDs; much
343.
by addaon 11mo ago
I wish National Theatre would re-release the Rosencrantz and Guildenstern are Dead productions with Cumberbatch and Radcliffe in memoriam, either on NTatHome or in theatres...
344.
by addaon 11mo ago
The very first thing I tried when Siri was released -- "set an alarm for ten minutes before sunset" -- still doesn't work. "What time is sunset?" and "Set an alarm for 5:03 PM" both worked on day one, and
345.
by addaon 11mo ago
Yes, "mov r, imm" also breaks dependencies -- but the immediate needs to be encoded, so the instruction is longer.
346.
by addaon 11mo ago
> That's not a plan, it's a suicide note with extra steps. Being an aging human is a suicide note. The extra steps are the entire point of retirement.
347.
by addaon 11mo ago
> One thing to remember is that unless you explicitly made a device to operate in space and even there beyond LEO, you quite probably might have seen no requirement for ECC memory for radiation reasons. This does not match my experience
348.
by addaon 11mo ago
As the OP, I agree with everything you said, but I suggest an alternate characterization: Some subset of people, including me, prefer written communication to video (regardless of whether the video is on YouTube or elsewhere). Since my favo
349.
by addaon 11mo ago
The I2C protocol is a distributed state machine. Each slave node needs to know what bit in the message sequence is being sent, to match it against its own address. As a result, a single missed bit results in a slave not recognizing its own
350.
by addaon 11mo ago
> This is one of those situations where the video is just an insane value-add above and beyond the Wikipedia article that this sort of response is baffling to me. The well thought out presentation and progression of the concepts. This is
351.
by addaon 11mo ago
Without video: https://en.wikipedia.org/wiki/Abel%E2%80%93Ruffini_theorem
352.
by addaon 11mo ago
ADB was pretty solid. A shared-single-wire bus that allows multiple slaves by including an address in the message... but includes a protocol-level reset that's used regularly, so a missed single bit doesn't jam things up unrecover
353.
by addaon 11mo ago
I can (and have in past) written a long explanation on my experience with this, but… Redundancy is a tool for reducing the probability of encountering statistical errors, which come from things like SEUs. Dissimilarity is a tool for reducin
354.
by addaon 11mo ago
I’d really, really like to know what microcontroller family this was found on. Assuming that this is a safety processor (lockstep, ECC, etc) it suggests that ECC was insufficient for the level of bit flips they’re seeing — and if the concer
355.
by addaon 11mo ago
"Shake mouse pointer to locate" is also nice.
356.
by addaon 11mo ago
> Everything Microsoft does in this space is excellent, VS Code almost feels like an app specifically designed for the blind at times. Yep. The start menu ads are also excellent as long as you're blind and can't see them.
357.
by addaon 11mo ago
> If they do continue to execute Yes, but Google will never be able to compete with their greatest challenge... Google's attention span.
358.
by addaon 11mo ago
Can you give an example? With something like Figure 1 of the paper converted to a convenient form for Lisp (s-expressions, presumedly), and assuming a function to convert it to binary, what would it look like to prove correctness of that as
359.
by addaon 11mo ago
I'd love some examples here.
360.
by addaon 11mo ago
How do you find out if the third-party seller you're choosing is correlated with the product that they choose to deliver, or if they're co-mingling inventory? You used to be able to get an answer from support in about 30 minutes o

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