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Type: Posts; User: brtaylor

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  1. Thread: uNav INS

    by brtaylor
    Replies
    682
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    134,664

    Hi Andrew, We flight test often with the...

    Hi Andrew,

    We flight test often with the version of the EKF implemented in our flight software without issues on both fixed wing and multi-rotor vehicles...
  2. Thread: SBUS Library

    by brtaylor
    Replies
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    12,185

    I'm not sure, hasn't been tested other than what...

    I'm not sure, hasn't been tested other than what you've been doing.

    If you're fine with the two write methods being called at the same time, an alternative approach is to use one timer and write...
  3. Thread: SBUS Library

    by brtaylor
    Replies
    56
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    12,185

    It's not flexible, which is why it's not...

    It's not flexible, which is why it's not implemented, but yes, you can work around it.

    In SBUS.cpp, you would change this (lines 26 - 33):


    #if defined(__MK20DX128__) || defined(__MK20DX256__)...
  4. Thread: SBUS Library

    by brtaylor
    Replies
    56
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    12,185

    Which Teensy are you compiling and testing on?...

    Which Teensy are you compiling and testing on? For Teensy 3.0 and 3.1/3.2, this would be expected behavior - I have to emulate two stop bits and define some timers to help with that, which would only...
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    Send us an email at info@bolderflight.com!

    Send us an email at info@bolderflight.com!
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    This is the cmake toolchain I use for Teensy...

    This is the cmake toolchain I use for Teensy based projects:



    set(CMAKE_SYSTEM_NAME Generic)
    set(CMAKE_SYSTEM_PROCESSOR arm)
    set(CMAKE_C_COMPILER arm-none-eabi-gcc)
    set(CMAKE_CXX_COMPILER...
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    Silly question. Why wireless when the distance is...

    Silly question. Why wireless when the distance is so short?
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    Thanks! That's an interesting reference.

    Thanks! That's an interesting reference.
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    Custom Teensy 3.6 Crystal

    I ran into an interesting observation and I'm looking for some insight. I typically use this crystal for my Teensy 3.6 based custom projects:...
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    I use KiCad.

    I use KiCad.
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    Here's a link to a Teensy 3.2 reference board...

    Here's a link to a Teensy 3.2 reference board clone:
    https://github.com/thewknd/teensy-boards/tree/master/Teensy%203.2%20reference%20board%20clone

    It has a shared cart on Mouser that you can...
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    Completely depends on what your requirements are....

    Completely depends on what your requirements are. We don't know the accuracy that you need to measure current or the expected current range. The click board isn't doing anything magical - it's simply...
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    The ATmega 328 and similar are great through-hole...

    The ATmega 328 and similar are great through-hole packages as well - very straightforward to design a working PCB and you can stick with hand-soldering through-hole parts. The reference manual is...
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    Yes, that's what's needed.

    Yes, that's what's needed.
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    Simply use one of the other bus objects, i.e....

    Simply use one of the other bus objects, i.e. Wire1 instead of Wire.
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    Thanks for that bit of information!

    Thanks for that bit of information!
  17. Replies
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    27,653

    Trying out MTP Responder. Shows up fine on...

    Trying out MTP Responder. Shows up fine on Windows 10 using a Teensy 3.6 with the built-in SD running MTP Blinky with the patch mentioned in the PR applied. I can create folders, but not rename them...
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    It definitely takes a bit of work to get FreeRTOS...

    It definitely takes a bit of work to get FreeRTOS working on Teensy 3.x since it has not been maintained. I also had issues getting floating point math to work on Teensy 3.5 and 3.6 and, ultimately,...
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    Are you asking because of servos? Anecdotally,...

    Are you asking because of servos? Anecdotally, all seem to be fine with 3.3V logic, even on high voltage supplies.
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    Yes, I've used the PJRC MKL02 for several...

    Yes, I've used the PJRC MKL02 for several projects where I needed to meet specific temperature ranges or access to pins not available on the Teensy board. It's allowed by PJRC and one of the great...
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    At least the processor and bootloader are rated...

    At least the processor and bootloader are rated for -40C; both the MK64FX512VMD12 and MKL02Z32 are -40C to 105C temperature rated. So you could roll your own Teensy 3.5 hardware design that is...
  22. Thread: Emmc

    by brtaylor
    Replies
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    656

    Got a little test setup - an EMMC breakout to a...

    Got a little test setup - an EMMC breakout to a micro-sd card adapter. Tested on windows via a micro-sd to USB converter I have and it shows up as a USB drive and formats correctly.

    Plugged into...
  23. Thread: uBlox Library

    by brtaylor
    Replies
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    18,646

    A couple of ways I can think of at the moment:...

    A couple of ways I can think of at the moment:
    1. You could look at the fix type and ensure that you have a time fix or better (i.e. 2D or 3D).
    2. You could look at the isValidDate() flag and the...
  24. Thread: uNav INS

    by brtaylor
    Replies
    682
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    134,664

    I'm too busy with client projects at the moment.

    I'm too busy with client projects at the moment.
  25. Thread: Emmc

    by brtaylor
    Replies
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    656

    That's pretty cool! I'll have to play around with...

    That's pretty cool! I'll have to play around with the library. I see some PCI to USB interface controllers on DigiKey, seems like I may be able to put a PCI slot on my boards and then use a M.2 2242...
  26. Thread: Emmc

    by brtaylor
    Replies
    15
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    656

    I'm using several GB; although, right now that's...

    I'm using several GB; although, right now that's being compressed and I'm being selective about data because I'm limited to a 1 MBaud connection between the SBC and Teensy. Certainly with a higher...
  27. Thread: Emmc

    by brtaylor
    Replies
    15
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    656

    Emmc

    Apologize in advance for a more rambling post than usual. Just finished one project and thinking about options for the next. I need to do some more research and hoping to jump start my lack of...
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    The backpacks are meant to work with each other....

    The backpacks are meant to work with each other. So, on the dual backpack you could have an SBUS Backpack next to a GNSS Backpack, for example, and have the total stack height less than using the...
  29. Thread: uBlox Library

    by brtaylor
    Replies
    111
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    18,646

    Good! Glad it's working well for you. Brian

    Good! Glad it's working well for you.

    Brian
  30. Thread: uBlox Library

    by brtaylor
    Replies
    111
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    18,646

    My latest and greatest is typically on GitHub, so...

    My latest and greatest is typically on GitHub, so this one should work fine:
    https://github.com/bolderflight/UBLOX

    It shows printing several values, but a full list of available methods to get...
  31. Read up on byte padding and structure member...

    Read up on byte padding and structure member alignment. If you really care about how data is aligned and need it to stay aligned across different devices, you should really define an unsigned char...
  32. Thread: SBUS Library

    by brtaylor
    Replies
    56
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    12,185

    You should just do readCal once and then print...

    You should just do readCal once and then print all the channels in succession.

    This line:


    x8r.readCal(&channels[0], &failSafe, &lostFrame)


    is just passing the addresses of the channels...
  33. Thread: SBUS Library

    by brtaylor
    Replies
    56
    Views
    12,185

    Hi John, Typically, people will estimate...

    Hi John,

    Typically, people will estimate non-dimensional coefficients to model the aircraft dynamics. One part of that process essentially normalizes the data by the airspeed. The mass properties...
  34. Thread: SBUS Library

    by brtaylor
    Replies
    56
    Views
    12,185

    Yep, the Teensys can do inverted logic and the...

    Yep, the Teensys can do inverted logic and the library is handling all of that for you.
  35. Thread: SBUS Library

    by brtaylor
    Replies
    56
    Views
    12,185

    What are you accomplishing with the N3904 and...

    What are you accomplishing with the N3904 and resistors? Should work fine with the SBUS receiver directly connected to the Teensy.
  36. Thread: SBUS Library

    by brtaylor
    Replies
    56
    Views
    12,185

    Looks like Oct 31, 2018.

    Looks like Oct 31, 2018.
  37. Thread: SBUS Library

    by brtaylor
    Replies
    56
    Views
    12,185

    Cool photos, thanks for sharing! I really like...

    Cool photos, thanks for sharing! I really like Osh Park for 2 and 4 layer boards, if you end up needing the extra complexity. Osh Stencils are nice for cheap stencils - my preference is their...
  38. Thread: SBUS Library

    by brtaylor
    Replies
    56
    Views
    12,185

    Easy peasy. My SBUS library can directly give you...

    Easy peasy. My SBUS library can directly give you pilot inputs. If you use the readCal function, you can get these so that full stick deflection is +/-1 on each channel.

    It sounds like you're...
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    Yes, I did a prototype run and those work fine...

    Yes, I did a prototype run and those work fine with the updated core software. Between grant writing season and contract work I haven't gotten around to putting together a production run; thanks for...
  40. Thread: uBlox Library

    by brtaylor
    Replies
    111
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    18,646

    Can you post the header and source of your...

    Can you post the header and source of your modified library enabling the additional packets?
  41. Replies
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    https://www.pjrc.com/teensy/schematic.html

    https://www.pjrc.com/teensy/schematic.html
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    Honestly, the best approach might be to get a...

    Honestly, the best approach might be to get a Raspberry Pi and have the Raspberry Pi program the Teensy.
  43. Thread: uBlox Library

    by brtaylor
    Replies
    111
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    18,646

    The beauty of the MIT license is that you can do...

    The beauty of the MIT license is that you can do what you want with the code. I can take a look if I have time, no guarantees.
  44. Replies
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    Pin 24 is PTE20 and Pin 25 is PTE21 (A10 and A11...

    Pin 24 is PTE20 and Pin 25 is PTE21 (A10 and A11 in the schematic). The problem is that TMK is for Atmel AVR boards and Teensy 3.x and LC are ARM - they're completely different and I would expect TMK...
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    https://www.pjrc.com/teensy/schematic.html

    https://www.pjrc.com/teensy/schematic.html
  46. Replies
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    I'm not sure about the cap, but the greyed out...

    I'm not sure about the cap, but the greyed out crystal is the optional 32.768 kHz crystal you can add to the bottom of the board. See the pinout here:
    https://www.pjrc.com/teensy/pinout.html
  47. Thread: uBlox Library

    by brtaylor
    Replies
    111
    Views
    18,646

    Doesn't matter as much with the Teensy - the main...

    Doesn't matter as much with the Teensy - the main issue is not overrunning the serial buffers before the library has a chance to parse.
  48. Thread: uBlox Library

    by brtaylor
    Replies
    111
    Views
    18,646

    The if (gps.readSensor()) returns true only on...

    The
    if (gps.readSensor()) returns true only on a valid packet. It is safe to use that data afterwards.

    The issue with delays in your code seem to be your arduino board (a nano) seems to have a...
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    SBUS works: https://github.com/bolderflight/SBUS

    SBUS works: https://github.com/bolderflight/SBUS
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    Also, just my curiosity, but where did you...

    Also, just my curiosity, but where did you download that MPU9250 library from?
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