fest

22 ms·

1. 241.▲
   by fest 8y ago

   From my experience: even when you have full Android sources for the device (vendor blobs for camera/modem notwithstanding) it is PITA to do something out of the ordinary. Want to enable hotspot on boot? Few dozen lines in Java or a she
2. 242.▲
   by fest 8y ago

   Have you tried cytisine (Tabex brand in Europe)? On the contrary to some other nicotine replacements, it seems to take the enjoyment of nicotine away, so you only get the bad taste from a smoke, which made a lot easier to quit for me.
3. 243.▲
   by fest 8y ago

   Doing so well, that one of the companies faced by a lawsuit from Segway just bought them (Xiaomi now owns Segway).
4. 244.▲
   by fest 8y ago

   > The only thing that's hard to come by cheaply is the battery. Dead laptop and power tool battery packs usually have at least some useable 18650 cells in them. A friend has built more than one battery pack for electric scooter out
5. 245.▲
   by fest 8y ago

   That doesn't mean it's not patentable though.
6. 246.▲
   by fest 8y ago

   I've seen embedded device which runs on yocto/poky flavour of Linux, and the main app chroots into Ubuntu 14.04 for no apparent reason.
7. 247.▲
   by fest 8y ago

   I found the approach taken by yocto quite powerful: it can be used not only to compile all kernel and all packages for the target system but also build a matching SDK (cross-compiler with matching libraries). The learning curve is quite ste
8. 248.▲
   by fest 9y ago

   Hashimoto's relatively easy to live with (at least, compared to other autoimmune conditions). If properly medicated with replacement hormones, no observable change in life expectancy. If goiter forms (which is a complication of undiagn
9. 249.▲
   by fest 9y ago

   It may very well be that either: these people think they have a legitimate need for the antibiotic or it is helping for a narrow portion of population. The problem is, people without medical background cannot really evaluate if a treatmen
10. 250.▲
    by fest 9y ago

    I am suspicious about this statement for the following reasons: * Some ST patents [0] say they are doing time of flight but have actually came up with slight variation on reflected signal phase shift measurement (see reply by Animats). * Se
11. 251.▲
    by fest 9y ago

    Did her endocrinologist prescribe her antibiotic? I'm asking this because I have Hashimoto's myself and none of the endocrinologists I've seen recommended anything else besides levothyroxine.
12. 252.▲
    by fest 9y ago

    I've bought Swissbit cards from Mouser/Farnell.
13. 253.▲
    by fest 9y ago

    That one detects phase difference of the reflected signal.
14. 254.▲
    by fest 9y ago

    I've never personally encountered a bug like this but I have hit my fair share of weird/hard to track down bugs over my embedded software career. Almost always, they leave me a) longing for the blissful ignorance of low level deta
15. 255.▲
    by fest 9y ago

    People doing electronics cover their tables with medium-high resistivity material mats (high enough so it doesn't interfere with bare electronics, but not completely dielectric). The mats are grounded to Earth ground via 1 megaohm resi
16. 256.▲
    by fest 9y ago

    Can't edit my comment anymore, but as multiple commentators pointed out, what I'm calling a non-linear system is probably just a higher order linear system.
17. 257.▲
    by fest 9y ago

    I don't have a lot of first-hand experience using LQR but I definitely have seen it being applied to systems that traditionally are thought of as non-linear with the respect of variable you can control. Maybe it's explained by the
18. 258.▲
    by fest 9y ago

    This is also the approach PX4/Ardupilot folks use. It's actually even more elaborate in their case: position loop -> velocity loop -> acceleration/angle loop -> angular rate loop -> motor outputs.
19. 259.▲
    by fest 9y ago

    > how have you come to this conclusion / explanation? Through personal suffering while working on firmware for UAVs (PX4/Ardupilot), CNC controllers (grbl, Marlin), inverted pendulum balancing exercises, RC car control etc. Sad
20. 260.▲
    by fest 9y ago

    Sure, but for such systems even a simple on-off controller works fine, if the sensor is close enough to heating element (and if it's too much decoupled, PID won't help either). The biggest issue for me was spending a lot of time t
21. 261.▲
    by fest 9y ago

    There was an "aha" moment for me when I realized that PID loop only works well for linear systems (and sometimes it's not obvious if a system is linear or not). Real world example: imagine you have a single-axis motion stage
22. 262.▲
    by fest 9y ago

    I'd argue having an easy way to snooze the alarm would lead to more health damage than dealing with acute pain promptly (i.e. burst appendix is something you really need to take care of now, not when it's most convenient). However
23. 263.▲
    by fest 9y ago

    Slightly OT, but I find it interesting how the definition of real-time depends on the industry: * Embedded systems: nanoseconds to milliseconds (depends on the system, but at the very least needs to be predictable within some bounds); * App
24. 264.▲
    by fest 9y ago

    This really hits if you try to merge audio which has been recorded separately from video (e.g. Raspberry Pi where at least a few years ago software did not support recording audio synchronously with video). And the worst thing is- it could
25. 265.▲
    by fest 9y ago

    Started an initiative which will allow to tick "{machine, deep} learning, computer vision" checkbox in company's product feature-list. Technically that means designing an FPGA-based vision system which interfaces with existin
26. 266.▲
    by fest 9y ago

    I disagree- maths has always been an essential tool of all engineering disciplines. Software engineering is not an exception (algorithms, control systems, graphics, simulations). Of course, a lot of people can and do write useful software k
27. 267.▲
    by fest 9y ago

    I stand corrected. By combining that with low-leakage wakeup timer ICs and low-leakage supercap, one could indeed design a device that runs for months on a single coin cell (transmitting every few hours).
28. 268.▲
    by fest 9y ago

    It is now: https://github.com/festlv/esp32-temperature-humidity-sensor
29. 269.▲
    by fest 9y ago

    Coin cells are not an option- it consumes around 200-300mA while actively transmitting, and around 10uA in (one of) sleep modes. I'm powering my custom temperature/humidity sensors with 18650 lithium batteries. I'm getting ar
30. 270.▲
    by fest 9y ago

    If you are ok with using older AOSP, Olimex Allwinner A20 based boards are a good bet. If you want a recent version of Android, I would look at Snapdragon 410c.