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  1. Replies
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    I wonder if it's an issue with counterfeits?

    I wonder if it's an issue with counterfeits?
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    The old emsensor boards modified to work with SPI.

    The old emsensor boards modified to work with SPI.
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    I just updated the library with an increased...

    I just updated the library with an increased delayNanoseconds time, should hopefully be a little more robust now.
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    Should work at a CPU speed of 600 MHz. The...

    Should work at a CPU speed of 600 MHz. The sampling rate will always be 1kHz or less because we're using the MPU-9250 internal filter. To go above the 1kHz, you need to disable the internal filtering...
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    Should work, or at least it works fine for me....

    Should work, or at least it works fine for me. Please post your complete code, the error message that you get indicating it's not working, and a picture of the sensor and connections to the Teensy.
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    I can't help with a walk through - I don't have...

    I can't help with a walk through - I don't have the sensor to test a driver against and my work is very busy at the moment. Maybe someone else on the forum can help?

    I wouldn't use the library you...
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    You'll want to use the Wire library:...

    You'll want to use the Wire library:
    https://www.arduino.cc/en/Reference/Wire

    If you search by the sensor name and "github arduino" you'll find some arduino drivers for the sensor. I've never...
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    Hi, I split that library between a version...

    Hi,

    I split that library between a version built for my build system and one for the Arduino. You want the library located here:
    https://github.com/bolderflight/mpu9250-arduino

    Brian
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    MSP is a binary protocol, I'd be tempted to try...

    MSP is a binary protocol, I'd be tempted to try UART2, which should be NMEA and at least human readable.
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    On your spreadsheet, I think MMOD Pin 17 and Pin...

    On your spreadsheet, I think MMOD Pin 17 and Pin 19 are swapped.
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    Thanks! I missed that MMOD Pin 4 was a UART. For...

    Thanks! I missed that MMOD Pin 4 was a UART. For MMOD Pin 40 and Pin 42, your spreadsheet has those as I2C buses, but when I look at the Teensy 4.1 pinout for Pins 40 and 41 (the corresponding Teensy...
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    There is a lot of capability built into this...

    There is a lot of capability built into this board! I started making a KiCAD symbol, matched back to the Teensy 4.1 pin numbers, and labeled the additionally functionality. I realize this is what...
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    Thanks! That's what I initially thought and got...

    Thanks! That's what I initially thought and got tripped up (and greedy) when I saw the USB VIN.
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    Sorry if this is a silly question - is there...

    Sorry if this is a silly question - is there power regulation on the micromod board? I see USB VIN on Pin 9, 3.3V enable on Pin 4, and 3.3V on Pin 74 and on Pin 2. What is the capacity of the output...
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    They could really learn from PJRC's pinout cards....

    They could really learn from PJRC's pinout cards. Even after looking at the SparkFun Hookup Guide table, it's not easy planning how I would use all the pins.
  16. The rise time does not change with voltage, but...

    The rise time does not change with voltage, but would push towards using the smallest resistor value in order to let the data line rise logical high, especially at higher bus speeds and longer bus...
  17. 4k7 is common with 5V systems, 2k2 with 3.3V. ...

    4k7 is common with 5V systems, 2k2 with 3.3V.

    Yes, one 2k2 on SDA and one on SCL pulled up to 3.3V. Only one set of pullups is needed per bus.
  18. If you're using I2C, I would recommend 2.2k...

    If you're using I2C, I would recommend 2.2k pullups on SDA and SCL (pulling up to 3.3V). If you're using SPI, I would recommend not using pullups. If you have multiple SPI devices on the bus, you...
  19. Section 7.2 on page 22 gives a schematic for a...

    Section 7.2 on page 22 gives a schematic for a typical circuit along with capacitor values:
    https://invensense.tdk.com/wp-content/uploads/2015/02/MPU-6000-Datasheet1.pdf

    Additionally, if you're...
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    So, I just tried clang-tidy on your code snippet...

    So, I just tried clang-tidy on your code snippet and it does produce a warning that the code will result in a dangling reference.
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    Note, I haven't tried either of these, but...

    Note, I haven't tried either of these, but there's a couple options that I see on Stack Overflow:
    1. Remove the _sbrk() function:...
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    The TJA1051AT/3/0Z‎ looks like a drop-in...

    The TJA1051AT/3/0Z‎ looks like a drop-in replacement.
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    CAN-FD MCP2562 Alternatives

    I'm designing a project and used the MCP2562FD-H/SN for prototyping. Of course, it's a victim of the chip shortage and I'm looking for good alternatives that are roughly the same footprint. Any...
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    The most rigorous standards I know of typically...

    The most rigorous standards I know of typically require at least two separate coding teams, one writing the code and the other independently reviewing it against the requirements.

    You can also set...
  25. I've seen a lot of blogs on modifying ovens, but...

    I've seen a lot of blogs on modifying ovens, but I just manually turn the knob while timing with a phone - works well enough with leaded paste and my temperature profile is so simple that I haven't...
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    Well, if someone is searching for this in the...

    Well, if someone is searching for this in the future and stumbles across the thread, they’ll have some solutions to use.
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    Frank B had an interrupt chain for Teensy 3.x -...

    Frank B had an interrupt chain for Teensy 3.x - I'm assuming that this would still work on Teensy 4.x.



    class interruptChain {
    public:
    void chainInterrupt(int intNumber, void...
  28. I do prototyping down to 0603 with a toaster...

    I do prototyping down to 0603 with a toaster over, solder paste, and a stencil. I've done some stuff down to 0402, but typically require rework when I get to that size. Recommend getting a good pair...
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    MK66FX1M0 Availability

    Hi Paul,

    I saw this question answered regarding other chips in the PJRC product range, would PJRC have some limited stock of MK66FX1M0 available to sell for custom boards?

    Thanks much!
    Brian
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    I don't have a ton of experience with Vagrant,...

    I don't have a ton of experience with Vagrant, but it's a way of automating the setup of a virtual machine, in this case a Virtual Box. So in a sense, it's kind of like a Dockerfile. Once the VM is...
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    About as you would expect. The first build takes...

    About as you would expect. The first build takes several minutes with a template-heavy code base. With CMake's caching, subsequent builds are fast. I think Docker would likely be a little faster.
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    Neat! Nice to see more CMake love. I've been...

    Neat! Nice to see more CMake love.

    I've been using Vagrant / VirtualBox as a multi-platform build environment with CMake:
    https://github.com/bolderflight/build-tools

    On Linux or WSL, I just...
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    For what it's worth, Mouser is showing about 900...

    For what it's worth, Mouser is showing about 900 in stock. Digi-key is out of stock.
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    Not Paul, so I can't speak for PJRC, but the...

    Not Paul, so I can't speak for PJRC, but the IMXRT seems to be on a 26 week lead from most distributors. Frankly, I'm just happy that it's not 52 weeks given the state of the industry right now. NXP...
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    Will do, thanks!

    Will do, thanks!
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    Now that the MKL02 has compatibility with the...

    Now that the MKL02 has compatibility with the IMXRT chips, would the MIMXRT1062CVJ5B or the MIMXRT1062CVL5B have the highest likelihood of working with the MKL02 designed for the MIMXRT1062DVJ6A/B...
  37. FYI, I did a pretty major update to the MAVLink...

    FYI, I did a pretty major update to the MAVLink library:
    https://github.com/bolderflight/mavlink

    It now supports:
    1. The heartbeat protocol
    2. Sending status messages to the ground station
    3....
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    For custom boards, the MKL02 needs to be...

    For custom boards, the MKL02 needs to be purchased from PJRC. Same limitation of the USB based firmware upload. The nice thing is that if you spin your own Teensy board and use a Raspberry Pi compute...
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    The only official way to upload code is via the...

    The only official way to upload code is via the Teensy USB port. If you have the Teensy USB plugged into the Raspberry Pi, that seems like it would be the most straightforward approach, use the hex...
  40. Hi, I wrote an SBUS library for Arduino,...

    Hi, I wrote an SBUS library for Arduino, including Teensy 4.x, maybe that will help?
    https://github.com/bolderflight/sbus-arduino/
  41. Thanks, that works for me on Teensy 4.1: ...

    Thanks, that works for me on Teensy 4.1:


    Teensy Loader, Command Line, Version 2.2
    Read "spi_example.hex": 18396 bytes, 0.9% usage
    Soft reboot performed
    Waiting for Teensy device...
    (hint:...
  42. Oh nevermind, I was testing with a Teensy 3.6,...

    Oh nevermind, I was testing with a Teensy 3.6, since that was what I happened to be working on. Tried again with the Teensy 4.1 and I can repeat the issue - no soft reboot working for me either.
    ...
  43. I just checked my use case again. If I don't have...

    I just checked my use case again. If I don't have the Teensy plugged in and powered on, my readout is:


    Teensy Loader, Command Line, Version 2.1
    Read "spi_example.hex": 15572 bytes, 1.5% usage...
  44. We'll need more details - is it hanging on ...

    We'll need more details - is it hanging on


    Waiting for Teensy device...
    (hint: press the reset button)


    Or is there some other problem? Have you installed udev rules? Is the teensy...
  45. Yes, use the teensy_loader_cli with the '-s'...

    Yes, use the teensy_loader_cli with the '-s' option.

    See:
    https://www.pjrc.com/teensy/loader_cli.html
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    Hi Robert, Check out this thread:...

    Hi Robert,

    Check out this thread:
    https://forum.pjrc.com/threads/54114-Extended-Pin-Numbering

    It's about a custom 3.6 and using the additional pins. In short, you may need to update...
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    Thanks! I actually meant air pressure as a...

    Thanks! I actually meant air pressure as a replacement for the BME280.

    Regarding staging, when I was working as a researcher at NASA AFRC, we had a close-call where the Flight Termination System...
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    Also, if you have good experiences with a...

    Also, if you have good experiences with a different static pressure transducer, please let me know.
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    So far our Flight Control Systems have only used...

    So far our Flight Control Systems have only used the Teensy 3.6. I do see noise on the BME280 if there is any sort of transmitter on the vehicle. Haven't had any issues with SD or any of the buses....
  50. I could be wrong, it's been a few years since I...

    I could be wrong, it's been a few years since I messed around with the Teensy 3.6 startup code, just one of the things that is sticking out at me on a quick glance.
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