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  1. Using Teensy to program an AtTiny1616?

    AtTiny1616 units have onboard comparators and configurable custom logic. I need to integrate several of them into a project built around a Teensy. I'd like to use the Teensy to program the AtTinys. ...
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    Teensy 4.1 current sink capacity

    I have 4 LEDs I need to drive. I had previously ran them directly from Teensy4.1 digital pins with the pins sourcing current. I changed to new LEDs with a larger voltage drop and I need to run the...
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    Thanks...already tried the search and it didn't...

    Thanks...already tried the search and it didn't look promising. I'll retry..
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    I have a project where I need dedicated analog...

    I have a project where I need dedicated analog comparators with digital output that compare an input with a DAC-generated reference from the MCU. I've been using an MCU with three onboard...
  5. How to make Teensy detect Windows or Mac?

    I have a custom keyboard project, and I need to support both Mac and Windows. I need to switch the CTRL\ALT\GUI modifier buttons depending the OS. How can I detect the OS?
  6. This turned out to be a really messed up Teensy...

    This turned out to be a really messed up Teensy 4.1 unit. I switch to a spare 3.2 and everything worked fine.
  7. Need help with strange keyboard matrix behavior

    I had strange behavior on my first attempt at a keyboard matrix. I'm picking it back up, and things are behaving strangely still.

    I'm using the wiring features here:...
  8. @DD4WH Good info on the transmit power limits. ...

    @DD4WH
    Good info on the transmit power limits.
    I have some threads going in other forums and informing yourself is remarkably difficult in this case it turns out.
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    Second lap through google was also unsuccessful....

    Second lap through google was also unsuccessful.
    I did turn up references to what you mentioned about vendors simply lying about FCC certification.
    Good info.
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    Interesting. I was aware of no rules forbidding...

    Interesting. I was aware of no rules forbidding data transmission.
    Where can I read?
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    I'm still confused on the legality you're...

    I'm still confused on the legality you're referring to. All that is required is sending stereo audio.
    Although I2C is bi-directional, its not required in this case, so stereo FM works
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    I don't follow. You can get low power FM...

    I don't follow. You can get low power FM transmitters that are legal. They go about a block on an empty station and to the next room on a populated station. Am I missing something?
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    Slow I2C\UART over stereo FM?

    I have an application where it will be cheap and convenient to use a low power FM receiver to manipulate a remote unit. The remote unit is to be cheap and low power. I'm looking into using a stereo...
  14. It appears that the multikey press code is...

    It appears that the multikey press code is causing the funny behavior. I used the customkeypad example and it didn't mess up the way multikey did.

    I didn't put the rows or column pins in any...
  15. The plan is for super low power using no...

    The plan is for super low power using no amplification.
    For FCC compliance, my reasoning is that Teensy's PWM only goes into hundreds of MHZ. At those frequencies, the transmit limit will be well...
  16. Ok, so it just got weirder. I swapped the pins IN...

    Ok, so it just got weirder. I swapped the pins IN CODE for rows 1 and 2. The physical row that failed before now works, and the physical row for the previously working row 2, now fails the same way...
  17. I removed the pin config lines and it doesn't...

    I removed the pin config lines and it doesn't change behavior. I'm running out of diagnostics looking for the short...
  18. Yes, the AMR DWT cycle counter is exactly what...

    Yes, the AMR DWT cycle counter is exactly what I'm looking to capture.
  19. Teensy digital pins as primative interrupt-based antennas?

    I recently had a disaster attempting to use buttons. I found I can wave my hands at the buttons and the RF noise could trigger a swarm of interrupts as if the button was mashed. This is useful...
  20. Logging the CPU time on an interrupt automatically?

    I have an application where an swarm of interrupts will hit a set of pins. The application is to communicate timing data over the air as finely in time as possible. I need to log the CPU time for the...
  21. Here's code and more data: The problem is with...

    Here's code and more data:

    The problem is with row 1:

    Using pin 4,27,26,24:*
    '4' comes through ok.
    3 does 3 and four
    2 does 1 and two.
    1 does 2 and 3.
  22. Keyboard matrix behaves differently based on choice of row pins

    I have a keyboard matrix that is 4 columns and 6 rows. On first test, I had two columns where pressing keys activated two different keys on the column. I couldn't find any wiring issues, so I...
  23. Best method to run MATLAB code on a Teensy

    I have a Teensy piping sensor data to MATLAB. The Teensy has enough processing power to handle the sensor processing, so I want to use MATLAB to generate the processing code and then port the code...
  24. That will NOT work. Those units are incredibly...

    That will NOT work. Those units are incredibly frustrating in hiding the fact that they cannot be used like this. I switched to using the OV7670. It should be able to accomplish close to what you're...
  25. Unless you need better performance, the library...

    Unless you need better performance, the library works as-is.
  26. Thanks for the in-depth replies. 2.2ks went in...

    Thanks for the in-depth replies. 2.2ks went in the design today...
  27. Need to confirm USB battery\Teensy charging circuit

    I have been using the Adafruit Teensy Feather Adaptor as a convenient breakout board that also has a lipo charger. The charge circuit handles the USB\VIN switchover so the USB\VIN solder pad does...
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    I want to use a BT4.0 dongle and I need to source...

    I want to use a BT4.0 dongle and I need to source a known-good unit. Is there something current?

    Also, I'm going to be experimenting with the BT4.0 dongles to see if they can be used with only...
  29. I went here:...

    I went here:
    https://forum.pjrc.com/threads/49358-T3-6-USB-Host-Bluetooth?highlight=USB+host+bluetooth

    The only GOOD unit for BT4 is a dead link.
  30. I'm using I2C on a Teensy4, with two MPU 6050s on...

    I'm using I2C on a Teensy4, with two MPU 6050s on each bus. In that config, the recommendation is only a single 2.2k pullup on both SDA and SCL?
  31. I'm working off of EagleCAD files from an...

    I'm working off of EagleCAD files from an Adufruit breakout and they're basically the same as the doc. The pull-ups on the breakout design are behind level shifters. Since I'm going to use Teensy's...
  32. That was my reasoning as well. I'm still in the...

    That was my reasoning as well. I'm still in the process of selecting a good BLE 4.0 dongle for this. There was a table from an old thread but the links are dead now. Any pointers appreciated.
  33. Behavior of USB Host with only 3.3v instead of 5v

    I was planning to use USB host mode on a portable unit in order to use USB BLE dongles for easy communication. I forgot about the 5v requirement. The battery only gives 3.7. If my goal is to operate...
  34. Integrating MPU 6050 - power conditioning and pull-ups

    I need to integrate MPU 6050 units on a custom PCB. I am working backward from github EagleCAD files. I am going to run the unit tightly coupled with a Teensy 4.0 and I need to iron out exactly what...
  35. Thanks...I'm seeking to use Digikey. My only...

    Thanks...I'm seeking to use Digikey. My only search criteria is maximum working height between 12.5. and 12 mm. They have 12.22 and 12.20mm. The two resulting gives two different units...I guess one...
  36. That still leaves me short on exact search...

    That still leaves me short on exact search criteria regarding dimensions. I have sources, I just need know exactly what to get.
  37. Pogo pin usage, sourcing and dimensions for Teensy 4.0 USB host and under side pads

    I want to use the USB Host and under-side solder pads on a Teensy 4.0. Available breakout boards use pogo pins per this link: https://www.pjrc.com/breakout-board-for-teensy-4-0/.

    I have not used...
  38. Best practices for accessing the USB Host pads on a Teensy 4.0

    I need to shrink a design that uses a Teensy 4.1. I need to change my PCB from using the through-hole header on the Teensy 4.1, to linking the Teensy 4.0 solder pads to a new PCB. I'm looking for...
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    I can see an old list of known-good USB dongles....

    I can see an old list of known-good USB dongles. I'm looking for a known good BT5.0 dongle, but the ones in the list are listed as not working. Is there an updated list?
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    Wow. Between this and the below it works now. ...

    Wow. Between this and the below it works now. Thanks for the help.
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    I added a 10 millisecond delay and it it helped....

    I added a 10 millisecond delay and it it helped. I now see the full file play the first time and no static. The second attempt still does nothing. The third is not reached. I get nothing on channel 1.
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    I formatted the SD card and tried one of the...

    I formatted the SD card and tried one of the files posted and it did almost the same thing. This time, the file quits playing after a fraction of a second, then garbage for a second or two. (The...
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    Strange audio playback behavior

    I'm making a soundboard that plays a file via the onboard DACs, but WAV playback from the SD card is behaving very strangely.

    I have full code below, edited down to a simple test of playing one...
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    Windows 10...and no, nothing else was plugged in.

    Windows 10...and no, nothing else was plugged in.
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    Very strange compile\restart behavior

    I have a setup where I am sending camera data over UDP that was working yesterday. Today I am seeing strange behavior:
    1. My first attempt to compile threw a bunch of weird errors. I closed the IDE...
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    USB Host BLE dongle support

    My goal is to stream IMU data to a PC over BLE. I have a T4.1 on a board with the USB host port set up. I'm hoping to get a pair of USB dongles to complete the link.

    I can see a thread with a...
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    Teensy-based custom keyboard projects?

    I completed a USB keyboard pass-through where a T4.1 translates the keystrokes from a one-handed gaming keyboard to enable full one-handed typing. I'm now sucked down the custom-keyboard rabbit-hole...
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    How to make Teensy 4.1 'hide' from OS?

    I'm using a Teensy 4.1 as a pass-through on a one-handed gaming keyboard to implement full single-handed typing and improve cursor navigation and access to It's working great and I'm getting used...
  49. I'm going through the OV7670 libraries and at...

    I'm going through the OV7670 libraries and at first pass I can't find pin assignments. It seems these libraries are using the 'CMOS sensor interface'. I think I need to read about that first. I...
  50. Thanks. I'm using a T4.1, so it looks like I can...

    Thanks. I'm using a T4.1, so it looks like I can use an OV7670 without cost issues.
    It looks like the libraries were last worked on last year. Were they left in a mature state?
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