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Type: Posts; User: EBRAddict

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  1. Replies
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    Do I need to do anything special in code to use...

    Do I need to do anything special in code to use the DP floating point operations on the T4? Or set any compilation switches somewhere? I know ARM has a special instruction set for those so I'm not...
  2. BAD USB CABLE!!! Started having the problem...

    BAD USB CABLE!!!

    Started having the problem again after moving some stuff around. Swapped out the USB cable and it worked fine.
  3. Were there massive sunspots or cosmic rays last...

    Were there massive sunspots or cosmic rays last night? /s

    I was experiencing the same issues this morning with fresh eyes and fresh coffee, so I started from scratch with a simple "Hello, World!"...
  4. The first was real hardware, Zotac Nano CI323...

    The first was real hardware, Zotac Nano CI323 (Intel Celeronish) with Ubuntu 18.04.2
    When that didn't work I tried Ubuntu 18.04 on a VM and then Ubuntu 16.04 on a VM, both of them on a different box...
  5. Ubuntu stops receiving USB Serial shortly after start (Teensy 3.2)

    I am using a Teensy 3.2 to transmit strings of formatted numbers to an intel-based PC. Ubuntu stops receiving after four lines.

    The streaming data looks like this:
    10.7 4.2 4.1 11.3 4.2 4.2 -0.07...
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    Looks to have a little better sensitivity. I only...

    Looks to have a little better sensitivity. I only found one breakout board company -- notwired.co (never heard of them) offering a board for $20US plus another $14US for shipping. More than I'm...
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    You get 16 bits of precision on the accelerometer...

    You get 16 bits of precision on the accelerometer and gyro. On the accelerometer for example, you can set the range to 2g, 4g or 8g. So if you're reading a 2g range with 16 bits the g/(2^bits-1)...
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    Should I ask how you found that issue? :) When...

    Should I ask how you found that issue? :)

    When you say multiple sensors on the same bus, was that multiple MPU-9250 or just a mix of devices, or both? Do you think it's an issue with a single...
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    Hi Brian, getting back into another project with...

    Hi Brian, getting back into another project with a MPU9250 in SPI mode. I don't know if this was in the original code but what is the purpose of the initial register read and CS cycle in the...
  10. One issue I ran into with USB was if I powered...

    One issue I ran into with USB was if I powered down the Teensy after a successful connection to the Pi, and powered the Teensy back up again, I was unable to reconnect the USB. Only by power cycling...
  11. ADC input voltage range and source impedance questions

    Between the datasheet for the K20 (Teensy 3.2) and the ADC library documentation am I right in assuming:

    The internal reference voltage is 1.2V ~ +/- 0.04V:
    If using that reference voltage for...
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    Seems to be working without hiccup now. I was...

    Seems to be working without hiccup now. I was able to restart a dozen times without issue. After I looked back at the code I found your scaling factors to SI units. Must have been bleary eyed last...
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    I finally got back into this MPU9250 SPI project....

    I finally got back into this MPU9250 SPI project. I'm using your git project for the SPI interrupt found here:...
  14. I received two kits today. The printed reference...

    I received two kits today. The printed reference cards were unexpected but will come in handy.
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    I think it's priced reasonably given the...

    I think it's priced reasonably given the software, support and community. My experience has been wholly positive.
  16. Reading bytes from BNO055 motion sensor in chunks vs. all at once via I2C

    Why not read all 44 motion bytes (or any subset that you need as long as they are contiguous) in one transaction?

    I'm using the Teensy BNO055 library from kriswiner/onehorse on Github...
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    Your code is fine, thanks for sharing it. I...

    Your code is fine, thanks for sharing it. I changed the references to SPI1 and it was sending data correctly on MOSI, SCLK and CS pins for Teensy 3.6 SPI1. My issue was with the Sparkfun board which...
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    Actually, that only changes the CS pin for the...

    Actually, that only changes the CS pin for the SPI0, I was able to verify that SPI1 would cause the output of the Teensy to be assigned to the correct pins which required changing the .cpp file from...
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    To make this work on a Teensy 3.6 with SPI1 (Pins...

    To make this work on a Teensy 3.6 with SPI1 (Pins 0-MOSI, 1-MISO, 31-CS, 32-SCK) should I just change the SPI.* references in the MPU9250.cpp to SPI1.*? I've tried it out and get the IMU init...
  20. Plenty of Teensy boards at Microcenter Atlanta

    It looked like they were well stocked with 3.2, 3.5, 3.6, ++ and a few others all @ normal price. I imagine their other stores have them as well.
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