planteen

71 ms·

691.
by planteen 10y ago
IMU means gyro, that is, it measures rotational rates. Accelerometers measure translational rates.
692.
by planteen 10y ago
If it is constructed just that there is an amplifier after what is supposed to be the output channel, you would probably be fine even if it was the the RealTek chip. There isn't going to be much coupling between a signal input to the o
693.
by planteen 10y ago
Yes. Aerospace engineers also seem to love it and Simulink, especially in areas involving simulations and control theory.
694.
by planteen 10y ago
It's nowhere near that expensive (dollars per kilobyte). I used the GlobalStar network on a project. The bigger cost for overage is 0.35 cents per second on data. The effective rate for a scp transfer (e.g., after all overheads) is abo
695.
by planteen 10y ago
Looks like Dragon runs VxWorks, see under Flight Software. http://www.spacex.com/sites/spacex/files/pdf/DragonLabFactSh... Can anyone who works at SpaceX chime in?
696.
by planteen 10y ago
Yes, I was saying why would you use Android instead of just bare Linux (as in Yocto). I doubt you will be writing an ADCS application in Java using a GUI. Also, I think the Falcon 9 uses VxWorks for at least some of its realtime control: h
697.
by planteen 10y ago
Thanks for that. That was an excellent post. As someone who has worked in the space industry, this quote is so true: "They [big aerospace contractors] liked the idea of PhDs assembling massive satellites in clean rooms out of custom pa
698.
by planteen 10y ago
Sure, you can use commercial parts in LEO for the processor. That is very common in the small satellite world already. But I really doubt they would run Android. Why not just bare Linux, possibly with the PREEMPT_RT patchset, or another RTO
699.
by planteen 10y ago
I'm late to this thread and very disappointed in the HN crowd that nobody has mentioned any of these things. OneWeb is trying to do the same thing and already has rights to the spectrum from the ITU. They are using Arianespace to launc
700.
by planteen 10y ago
Somebody who easily looses their cool tends not to be a great boss in my experience.
701.
by planteen 10y ago
I think once you start getting potentials over 10 kV, the Schottky effect starts to give minor x-ray emissions. The more major or typical source is from tubes. Most tubes at high voltages will emit x-rays, even if that is not their intent,
702.
by planteen 10y ago
That's for a public repo. I'd bet the vast majority of companies have private repos.
703.
by planteen 10y ago
Interesting. I rarely have a reservation when driving on a multi day trip. Instead, I use the fact that it's already late as leverage to get a lower rate. I'm about 50/50 on getting that to work. I'm not the best sales p
704.
by planteen 10y ago
Very cool! I love applications of emulation like this. I remember EmuDX many moons ago having similar goals of making retro games look more modern.
705.
by planteen 10y ago
I like those choices, especially Harvest Moon.
706.
by planteen 10y ago
Yes it is and it is terrible. The lack of upstreaming also makes things like applying the PREEMPT_RT patches much more difficult than it should be. You might be stuck at a version of the kernel where PREEMPT_RT was never released, not to me
707.
by planteen 10y ago
Yeah I was thinking the same thing. I imagine finding a part on that board by reference designator is hard. I can't imagine turning in a schematic drawn like that (parts rotated) for a test in college.
708.
by planteen 10y ago
The board requires custom modifications to the kernel. These modifications never get cleaned up and submitted as patches to the kernel. So you are stuck with a kernel frozen in time.
709.
by planteen 10y ago
I used to get the mobile versions of pages on the desktop. Not because I was on a slow connection, just because the text is the meat for most things on the Internet. Now there's less of a point in doing that.
710.
by planteen 10y ago
Asus ZenBook is nice
711.
by planteen 10y ago
Sorry to hear that. :(
712.
by planteen 10y ago
You see Ada used in legacy code bases in aerospace and defense. A big problem, at least at an ex employer of mine, is that no young engineers have a desire to learn Ada. It completely pigeonholds you to the aerospace/defense industry&#
713.
by planteen 10y ago
The Linux kernel still has support. Running Debian is no longer an option, but I doubt many embedded systems were doing that anyway. Most probably were running some Yocto image from the SoC vendor. So it just means cross compiling from sour
714.
by planteen 10y ago
It's the compatibility issues that stop me from doing that anymore. I don't have time for a video card / motherboard combo that lock up intermittently once every 2 days. I'd rather just buy a decent workstation or laptop
715.
by planteen 10y ago
Yeah I agree, it seems like that between an accelerometer and gyro that it should be fairly clear when you reach the ground condition. Maybe a switches that engages when a lander legs are pressed or something similar as well.
716.
by planteen 10y ago
I assume this is a joke? Is Haskell suitable for hard real-time systems with things like lazy evaluation and a GC?
717.
by planteen 10y ago
In my experience, hardware is much more difficult to debug. But my hardware experience is limited to FPGAs, never a full ASIC team. There are nightmarish bugs in hardware associated with things like clock domain crossings, bad timing constr
718.
by planteen 10y ago
> if would have been a glitch that would cause the program to halt unexpectadly, the engines would have remained running I don't know about that. I've worked on systems where there is some hardware with thruster duration that s
719.
by planteen 10y ago
If a that stock over time covers inflation and pays a dividend, absolutely.
720.
by planteen 10y ago
As far as the RTOS, it sounds like they use Linux: > Linux is used for everything at SpaceX. The Falcon, Dragon, and Grasshopper vehicles use it for flight control, the ground stations run Linux, as do the developers' desktops. Spac

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