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  1. Replies
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    I just grabbed it from luni's octopart BoM:...

    I just grabbed it from luni's octopart BoM: https://octopart.com/bom-tool/5AbwHvxe

    Does not include the connector, since that would be on the carrier board.
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    luni, really nice work, love all the...

    luni, really nice work, love all the documentation.

    Just FYI, for anyone interested, I did some quick back of the envelope estimates and arrive at somewhere around $35 to $45 USD per board if...
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    It's 63/37 tin to lead ratio. The full...

    It's 63/37 tin to lead ratio. The full description is:
    https://www.kester.com/products/product/ep256-solder-paste

    I typically order through OSH Stencils, but looks also available on Amazon. I...
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    I have not had success without a stencil, but I...

    I have not had success without a stencil, but I haven't tried it more than once. Maybe someone more experienced at freehanding it can comment...

    Regarding the reflow, I recommend the following...
  5. Yes, kind of. You could create a recording buffer...

    Yes, kind of. You could create a recording buffer as an array of 8 bit types (i.e. uint8_t) and then use some functions to write or read (push or pop) 10 bit data from that array. So, it's not...
  6. I mean, generating gerbers from KiCAD is as...

    I mean, generating gerbers from KiCAD is as simple as clicking "file" -> "plot" in the menu and selecting a destination folder for them to be printed into.
  7. I tried both Eagle and KiCAD and found them both...

    I tried both Eagle and KiCAD and found them both equally unintuitive, so I learned KiCAD since it is open source and doesn't have restrictions on the number of layers. Having learned it, it really...
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    I have it here:...

    I have it here:
    https://gitlab.com/bolderflight/software/core/-/tree/main/tools

    EDIT: Oops, that would be compiled for the 3.x, I haven't made the modifications for the Teensy 4.x yet.
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    My guess is the encryption is needed to protect...

    My guess is the encryption is needed to protect the PJRC proprietary stuff needed on the 1062 chip to make everything work.

    On the offchance that Paul sees this, I'd be willing to purchase both...
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    BAT54C solves the VBAT problem pretty cleanly.

    BAT54C solves the VBAT problem pretty cleanly.
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    Neither, since it's not built for Teensy. Try...

    Neither, since it's not built for Teensy. Try selecting the Teensy board, you'll only get one hex file.
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    Portable Data Acquisition System

    My startup, Bolder Flight Systems, recently completed development and flight validation of a Portable Data Acquisition System (PDAS) for manned aircraft. It was developed with the International Test...
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    This is a command line uploader for Teensy:...

    This is a command line uploader for Teensy:
    https://www.pjrc.com/teensy/loader_cli.html

    The cool thing with using Linux is that you can use the "-s" option, so you don't even need to press the...
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    Yes. I don't like the 490-18285-1-ND that...

    Yes.



    I don't like the 490-18285-1-ND that you suggested, I haven't used it, but the ESR is really high and I had issues, likely with ESR, on a prior custom Teensy 3.6 that I did. I've...
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    BGA Decoupling Capacitors

    I'm in the process of laying out my first custom Teensy using the BGA version of the MK66FX1M0 (i.e. Teensy 3.6) microcontroller. Typically, when I'm using the LQFP version of that chip, I place...
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    I'm a huge proponent of CMake. For my builds that...

    I'm a huge proponent of CMake. For my builds that have options, like which microcontroller to compile for, I use definitions so that I can choose between them on the command line. ie:

    cmake .....
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    With everything on 3.3V, I've just wired from the...

    With everything on 3.3V, I've just wired from the SD to the microcontroller. Make sure you have enough current capacity for the SD - they can be a bit power hungry.
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    Wow, great news! Especially if it has an...

    Wow, great news! Especially if it has an industrial temperature range, or close to it, would be nice to use in commercial products.
  19. My team uses WSL for loading software to Teensy....

    My team uses WSL for loading software to Teensy. Did you know that you can call Windows executables from the WSL environment? The easiest path that we've found is calling the windows version of the...
  20. @Pilot, thanks for the feedback, that's...

    @Pilot, thanks for the feedback, that's excellent!



    It's MIT - agree that we should put it in every file.



    I'll be sure to check it out. We have good unit tests for libraries that aren't...
  21. I finished getting our software open-sourced:...

    I finished getting our software open-sourced:
    https://gitlab.com/bolderflight/software

    We organized the software into many focused repos of limited scope to enhance code readability, re-use, and...
  22. Not OP, but typically you try to avoid latency....

    Not OP, but typically you try to avoid latency. Aircraft dynamics are pretty fast. Consider an aircraft that has an attitude hold control law that is trying to maintain level pitch and roll. It...
  23. Interesting! I'm actually in the process of...

    Interesting! I'm actually in the process of open-sourcing all of our flight controller software. We're still using the Teensy 3.6 microcontroller and haven't hit any performance limitations yet....
  24. Why not do a custom board? Then you can design...

    Why not do a custom board? Then you can design the placement and type of USB connector. Manufacturing costs might actually be cheaper than using the Teensy as well - the assembly shop we use charges...
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    Just to add on to what Pilot is saying, when I've...

    Just to add on to what Pilot is saying, when I've had a need to do similar operations in the past, and when I was reasonably certain that structs were ordered in a way such that they would be packed...
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    Best guess without seeing the whole...

    Best guess without seeing the whole thing...Configuration is a struct and c.data is an array of chars or unsigned chars. They're casting the data pointed to by c.data to the struct - in other words,...
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    The specs you link to for that servo mention a...

    The specs you link to for that servo mention a frequency of 333 Hz. Most standard servos, and indeed the servo library, are designed to work at 50 Hz. Do you know if that servo can operate at the...
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    No, you can: 1. Use a different IDE and just use...

    No, you can:
    1. Use a different IDE and just use Arduino to compile.
    2. Paul supplies a Makefile, so you can use GCC with GNU make.
    3. The core software is available, so you can adapt it to...
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    IIRC, some people wanted access to the raw counts...

    IIRC, some people wanted access to the raw counts from the sensor data instead of the float values.
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    The library has not been updated for Teensy 4.x....

    The library has not been updated for Teensy 4.x. There has been a fork and a PR to incorporate the necessary updates, but I haven't managed to test it yet (still haven't taken my Teensy 4 out of the...
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    strlen is not including the null character when...

    strlen is not including the null character when it gives you the length. You should be using:


    char dirName[4 + strlen(listOfSynthTypes[i])];


    Instead of:


    char dirName[3 +...
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    Thanks! For some reason I thought that Teensy 3.6...

    Thanks! For some reason I thought that Teensy 3.6 supported higher bitrates, maybe through CAN-FD.
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    Teensy 3.6 Maximum CAN Bitrate

    Apologies in advance since I think this has been covered, but what is the maximum bitrate for two Teensy 3.6 assuming that I get compatible transceivers? Searching for "CAN" was giving me erroneous...
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    That's really convenient!

    That's really convenient!
  35. When I use this: static constexpr...

    When I use this:


    static constexpr HardwareSerial &GNSS_UART = Serial3;


    It creates a reference to Serial3 called GNSS_UART. So I can use GNSS_UART in my code instead of Serial3. The...
  36. I use this all the time in my code: static...

    I use this all the time in my code:


    static constexpr HardwareSerial &GNSS_UART = Serial3;
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    That looks like your documents folder - i.e....

    That looks like your documents folder - i.e. where you would make sketches and install libraries. Teensyduino is asking for the install location of the arduino program. Typically this would be in...
  38. It's been a while, but if I remember correctly,...

    It's been a while, but if I remember correctly, core_pins.h and pins_teensy.c are both needed to be modified to use the additional pins for GPIO. For other functions, like analog input, you would...
  39. You have to modify the core library to add the...

    You have to modify the core library to add the additional pins.
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    Can you increase the buffer size?

    Can you increase the buffer size?
  41. Similar discussion here:...

    Similar discussion here:
    https://forum.pjrc.com/threads/61963-Remove-compiler-warnings-from-libraries-we-ship

    Our workflow is a little different - we're using GitLab and CMake for compiling...
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    Can you post pictures of your wiring for SPI and...

    Can you post pictures of your wiring for SPI and I2C?
  43. That's really cool to see! For work, we've been...

    That's really cool to see! For work, we've been adding automated testing to all of our code using the GitLab CI pipeline and Google Test. Works great for code that can run on either Teensy or Linux,...
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    The way I set up my toolchain, make blink_hex...

    The way I set up my toolchain, make blink_hex would make the hex file and make blink_upload flashes the teensy using the command line uploader.
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    Yeah, I tend to use WSL for compiling Teensy...

    Yeah, I tend to use WSL for compiling Teensy projects with CMake on Windows. Works like a charm.
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    Hard to say what the issue is without more...

    Hard to say what the issue is without more insight into how you're adding files and what the error messages you get are.

    We have a version of the Teensy 3.x core that we use for our projects and...
  47. 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...
  48. Thread: uNav INS

    by brtaylor
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    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:...
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