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    Running the Teensy4.1 TRNG exclusively with 0.1...

    Running the Teensy4.1 TRNG exclusively with 0.1 million samples took ~90 minutes - too slow.

    Using the TRNG as a random seed for the ISAAC PRNG is a decent cryptographic generator and very fast. ...
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    512 random bits in 52780 us is too slow for my...

    512 random bits in 52780 us is too slow for my project.

    For now I will use the T4 true random number generator (TRNG) as the random seed.

    Then use a fast pseudo random generator (PRNG) in the...
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    Odd. Unable to edit my original post. Can this...

    Odd. Unable to edit my original post. Can this be changed?
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    Teensy 4.1 Random Number Generator

    Finally jumped on the Teensy 4 bandwagon. Just received a couple of 4.1 boards, and two 4.0 boards. Tried compiling a T3.6 robotic project on the 4.1, but got this error related to my Random Number...
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    This PH7 is a very intriguing board. Has GPU...

    This PH7 is a very intriguing board. Has GPU acceleration and computer vision abilities - very relevant for the AI revolution underway! Also really like the two 80-pin high density connectors and...
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    A T4.x in a 3.6 form factor would be great. It's...

    A T4.x in a 3.6 form factor would be great. It's somewhat surprising that the 3.2 form factor is the best-seller. I suppose price outweighs all. $19.XX is a bargain. If all form factors were the...
  7. Not sure what is different since the original...

    Not sure what is different since the original post, but I am able to upload programs. However, I have to press the Teensy button every time I attempt to upload a program. To back up a bit, I first...
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    I'm a big T3.5 and 3.6 customer. I have not...

    I'm a big T3.5 and 3.6 customer. I have not purchased a T4 because of the small GPIO form factor, but will definitely obtain several T4.1 modules when ready. But I may purchase a T4 sooner than...
  9. Teensy 3.6 COM Port Conflicts with Other Device

    For some reason, my Teensy 3.6 COM Port (COM6) on Windows 10 conflicts with a 3D printer that uses the same Port ID. The printer was installed when the Teensy was not connected. As a consequence,...
  10. Teensy Serial Communication with Jetson Nano

    Had a heck of a time trying to get the Jetson Nano UART working, but finally got it to serially communicate with a Teensy 3.5. The Jetson peripherals are not packaged in convenient ready-to-go...
  11. Teensyduino 1.46 on NVIDIA Jetson Nano - It Works

    Done many projects using Teensy 3.2, 3.5 & 3.6 exclusively on a Windows 10 platform. I ordered the NVIDIA Jetson Nano to do real-time Visual Recognition. Linux is very different. I decided to...
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    Lots of posts to read through to get a top level...

    Lots of posts to read through to get a top level summary of T4 development. Does pjrc plan on updating posts #4, #5, and #6?

    Overall, is T4 more difficult to develop than the other teensy boards?
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    Once the the "i.MX RT 1060" is integrated with...

    Once the the "i.MX RT 1060" is integrated with your PCB, can the integrated device be considered a single board computer?
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    Fair enough that Teensy 4.0 is not released yet,...

    Fair enough that Teensy 4.0 is not released yet, but there is a lot of buzz out there. I saw the thread, but I could not find top level information about price and specs, aside from the selected...
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    Teensy 4.0 Price & Specs

    Looking over the "i.MX RT 1060" datasheets, I am very impressed with all the features on this single chip not currently in the teensy lineup such as 600mhz speed, double-precision floating point...
  16. I cannot stress enough the importance of using...

    I cannot stress enough the importance of using twisted-pair wire bundles for long SPI lines. I only use CAT6 or CAT7, although CAT7 cables are rather stiff.

    Before you redesign, observe the...
  17. Can you suggest a tri-state buffer with a 0.1"...

    Can you suggest a tri-state buffer with a 0.1" DIP form factor?
  18. As I pointed out, the three SPI devices work...

    As I pointed out, the three SPI devices work solidly on their own, including pairing the ILI9341 display and IMU. I did try adding 10K pull-ups at each chip-select channel as this site suggested,...
  19. Yes, I use the hardware SPI functions outlined in...

    Yes, I use the hardware SPI functions outlined in your link. I have not tried the faster "spi4teensy3" library.

    My devices work fine on their own or paired with the ILI9341 display. But for...
  20. Multiple SPI Devices - Two's Good, Three's a Crowd

    My Teensy3.6 with three SPI devices is having difficult intermittent problems.

    On one hand I have a Teensy 3.6 project with two SPI devices that work solidly in a program for-loop: an IMU...
  21. Because they implemented this adapter does not...

    Because they implemented this adapter does not automatically mean its popular and successful. For those customers, why not just go with a Teensy 3.5 or 3.6.

    But the bigger question is what is to...
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    Yes, that makes sense. I looped the K66 random...

    Yes, that makes sense.

    I looped the K66 random number generator function. A plot of just a small subset appears very random and correctly ranges from ~0 to ~2^32-1 (of course those limits are...
  23. It's odd that Teensy3.6 without headers is more...

    It's odd that Teensy3.6 without headers is more expensive at digikey ($32.50) when it can be purchased at PJRC and Sparkfun for $29.25. At Adafruit it's $29.95. Usually Adafruit has lower prices...
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    Like I said, trng() seems to return values...

    Like I said, trng() seems to return values greater than 1e9 only. I'll run it for several minutes to satisfy myself.

    In your timing loop, why did you multiply REPS by 32 million, did you mean...
  25. Not too long hopefully. Beyond the Teensy4X,...

    Not too long hopefully.


    Beyond the Teensy4X, is a Teensy single-board-computer possible on a 3.6-like form factor? An SBC would be the next logical progression after an i.MX processor.
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    Thanks for that. It compiles and runs on my...

    Thanks for that. It compiles and runs on my Teensy 3.6.

    I was expecting the random number "r" to range from 0 to 2^32-1, but the values are consistently large, in the order of 1e9. Is "r" the...
  27. So the i.MX processor is the next Teensy chip...

    So the i.MX processor is the next Teensy chip possibly on a 3.2-like and 3.6-like form factor.

    Beyond that, is a Teensy single-board-computer possible on a 3.6-like form factor?
  28. Open-ness and mining feedback is excellent...

    Open-ness and mining feedback is excellent business practice. Involving the community in the design is a potential nightmare, so I'm glad you are not completely heading in that direction. You make...
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    Teensy 3.6 Random Number Generator

    Is there a Teensy 3.6 library or function that accesses the hardware random number generator in the K66 chip?
  30. What is PJRC's thought on microcontroller for the...

    What is PJRC's thought on microcontroller for the future Teensy? The Kinetis K66 is already at the top of the K-series performance class. Are you considering a new direction, like the i.MX...
  31. I mainly buy 3.6 modules - for the processing...

    I mainly buy 3.6 modules - for the processing power, speed, RAM, memory, pins, 14bit ADC and price. I do find the 3.3V limitation annoying because many of my sensors are 5V, but it's nice that I can...
  32. This is a difficult design problem. On how to...

    This is a difficult design problem. On how to get out the most pins from the CPU while keeping the module footprint small and cost low and make everyone happy. With all this back and forth on extra...
  33. For instance, I still pickup the Teensy 3.6 inner...

    For instance, I still pickup the Teensy 3.6 inner pins (AREF, A10, A11 etc.) with upper male headers while the side rows are anchored to a breadboard.

    Similarly, on the concepts above, the...
  34. I think of the Teensy as a compact and...

    I think of the Teensy as a compact and rectangular, self contained "system on a module" with 0.1 inch pins that will integrate on a custom PCB, or expansion shield, or just a breadboard. Just like...
  35. I like the additional row, but I would prefer a...

    I like the additional row, but I would prefer a whole 0.1 inches to solder in a male or female header. The 0.05 inches would still obscure a breadboard row, so might as well go with 0.1 inches.

    I...
  36. I am now convinced that anything longer than...

    I am now convinced that anything longer than Teensy 3.6 is too much, but as short as Teensy 3.2 is too little. I'm very happy with the Teensy 3.6 on a standard breadboard. My motor drivers, IMUs,...
  37. When I saw those awhile back, my first impression...

    When I saw those awhile back, my first impression is that they were copying the success of the Teensy.

    For me, the Feather is too small, just not enough pins on the sides. To my earlier...
  38. I appreciate that fully, and please take my...

    I appreciate that fully, and please take my suggestion as a suggestion only. Not having the bottom pads more readily available is not a deal breaker.

    On the size of the T3.5 and T3.6, my feedback...
  39. Okay, I see I need to be more specific and...

    Okay, I see I need to be more specific and practical with my suggestions.

    Did some more digging and found a good example of a micro connector that would fit on top. This suggestion applies to...
  40. No of course not. That's just an example, and a...

    No of course not. That's just an example, and a horrible one at that. Here's a better example:

    https://www.adafruit.com/product/2098

    The main point of the suggestion is this: bring out the...
  41. This defeats the purpose of quick prototyping on...

    This defeats the purpose of quick prototyping on a breadboard.


    I can appreciate that. But in the future, it would be nice to have either: (1) a longer Teensy board with all pins on top, or (2)...
  42. Any Plans for a Teensy Board with Bottom Pads on Top?

    So many useful bottom pads on my Teensy3.6. Any plans for a longer version so that all pads are on top? For the users it would be very accessible and still breadboard friendly. I suppose that's a...
  43. My Windows 10 PC has CAD software, business...

    My Windows 10 PC has CAD software, business software, MS Office, Matlab, Oculus Rift, etc., most of which would not run on Linux and I'd need new licenses for others. For me, switching anti-virus...
  44. That's virtually impossible to determine because...

    That's virtually impossible to determine because so many *.exe and *.dll files and scratch files and directories are involved.




    I did all the arduino*.exe files, teensy*.exe, and some...
  45. McAfee LiveSafe only allows files to be excluded...

    McAfee LiveSafe only allows files to be excluded from the RTS (real-time-scan). Not directories, sadly.

    Last night I did a chat session with a McAfee representative, and I even granted him access...
  46. This overall issue is getting worse. A few weeks...

    This overall issue is getting worse. A few weeks ago, restarting the Arduino IDE did the trick. This week, that no longer worked.

    As I said in my first thread, I had to add several *.exe files...
  47. Error Compiling for Board Teensy 3.6 - McAfee Problem

    The simplest Teensy 3.6 program that previously compiled using Arduino-1.8.5 and Teensyduino 1.40 (downloaded 2 weeks ago) on a Windows 10 64-bit system, no longer compiles. It takes nearly 30...
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    Thanks for that. I've been in communication with...

    Thanks for that. I've been in communication with Pixy people and they verified that the SPI pins are 3.3V. So need for level shifting with the Teensy 3.6.
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    The aforementioned Pixy functions for SPI...

    The aforementioned Pixy functions for SPI communication with the Teensy 3.5 are working well. Now I want to try the setup on my Teensy 3.6 for processing speed, however it's not 5V tolerant. ...
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    I went ahead a developed functions to read Pixy...

    I went ahead a developed functions to read Pixy data with an SPI connection for Teensy 3.5 & 3.6. It's simple and robust code designed to use with other SPI devices with a single SPI connection. ...
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