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  1. Read the licenses of the code that you use from...

    Read the licenses of the code that you use from external sources (i.e. the Teensy cores) and follow the guidelines in those. If license obligations are too onerous, don't use that library and write...
  2. Thread: uNav INS

    by brtaylor
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    147,186

    Thanks for posting! I'm going to have to think...

    Thanks for posting! I'm going to have to think through this a bit more.
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    I'd be super keen if someone got NAND flash...

    I'd be super keen if someone got NAND flash working with Teensy. Having storage size rivaling an SD card in a soldered on solution would be awesome.
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    Not with the Teensy 4.0, since the bootloader...

    Not with the Teensy 4.0, since the bootloader chip isn't available yet, but plenty of people have with the Teensy 3.x. Be sure to read through the links on this page:...
  5. Maybe I'm misunderstanding your goal, but I would...

    Maybe I'm misunderstanding your goal, but I would think about this some more. Are you actually trying to get analog data or digital pin state (i.e. on or off)? If it's digital pin state, then you...
  6. Thread: uNav INS

    by brtaylor
    Replies
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    Great to hear! Yeah, with the platforms I've been...

    Great to hear! Yeah, with the platforms I've been testing for, they're always moving some.
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    Yes, they're no longer for sale - will need to be...

    Yes, they're no longer for sale - will need to be updated to work with the Teensy 4 / 4.1 pinout.
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    Here is the Backpack pinout. I'd be curious to...

    Here is the Backpack pinout. I'd be curious to know if/what would need to be changed to work with Teensy 4.0. Please let me know if you need additional information.
    20566

    There were two voltage...
  9. Thread: uNav INS

    by brtaylor
    Replies
    708
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    147,186

    Yeah, seems weird - it's too big of an error to...

    Yeah, seems weird - it's too big of an error to be declination. I haven't had a chance yet to do a deep dive into what's going on.
  10. Thread: uNav INS

    by brtaylor
    Replies
    708
    Views
    147,186

    Attached is a zip of the corrected code. It was...

    Attached is a zip of the corrected code. It was being used with some CMake build tools, but should be easy enough to get it working as an Arduino library. Requires Eigen.

    Yaw tracking has been...
  11. Thread: uNav INS

    by brtaylor
    Replies
    708
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    147,186

    Love the F9P's - especially adding in CORS...

    Love the F9P's - especially adding in CORS corrections, fast time to fix and low standard deviation.

    Haven't done too much with this filter, there were a couple minor errors discovered, but mostly...
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    Seems like this deserves its own thread.

    Seems like this deserves its own thread.
  13. Thread: SBUS Library

    by brtaylor
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    Hey John, In the SBUS library, you'll see that...

    Hey John,

    In the SBUS library, you'll see that I set the baud rate to 100,000 in the begin method:
    https://github.com/bolderflight/SBUS/blob/master/src/SBUS.cpp#L47

    Where _sbusBaud is defined...
  14. Thread: SBUS Library

    by brtaylor
    Replies
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    16,091

    Hi Funwey, Have you downloaded the library...

    Hi Funwey,

    Have you downloaded the library recently? I only recently edited it to enable the Teensy 4.
    https://github.com/bolderflight/SBUS

    Also:
    1. Don't use the inverter circuit. The Teensy...
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    You're right, now that I take a closer look - the...

    You're right, now that I take a closer look - the bytes are repeated.

    The prmac function seems to work fine.
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    Awesome, I can confirm that works. Thanks!

    Awesome, I can confirm that works. Thanks!
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    With Teensy 3.6 at any CPU setting above 120 MHz,...

    With Teensy 3.6 at any CPU setting above 120 MHz, running this code (https://github.com/FrankBoesing/TeensyMAC/blob/master/examples/PrintInfo/PrintInfo.ino) and library...
  18. Thread: uNav INS

    by brtaylor
    Replies
    708
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    147,186

    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...
  19. Thread: SBUS Library

    by brtaylor
    Replies
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    16,091

    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...
  20. Thread: SBUS Library

    by brtaylor
    Replies
    68
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    16,091

    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__)...
  21. Thread: SBUS Library

    by brtaylor
    Replies
    68
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    16,091

    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!
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    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...
  39. Thread: Emmc

    by brtaylor
    Replies
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    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...
  40. Thread: uBlox Library

    by brtaylor
    Replies
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    22,911

    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...
  41. Thread: uNav INS

    by brtaylor
    Replies
    708
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    147,186

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

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

    by brtaylor
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    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...
  43. Thread: Emmc

    by brtaylor
    Replies
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    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...
  44. Thread: Emmc

    by brtaylor
    Replies
    15
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    1,025

    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...
  46. Thread: uBlox Library

    by brtaylor
    Replies
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    22,911

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

    Good! Glad it's working well for you.

    Brian
  47. Thread: uBlox Library

    by brtaylor
    Replies
    119
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    22,911

    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...
  48. 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...
  49. Thread: SBUS Library

    by brtaylor
    Replies
    68
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    16,091

    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...
  50. Thread: SBUS Library

    by brtaylor
    Replies
    68
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    16,091

    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...
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