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  1. Thanks, this is very educative, learned a thing...

    Thanks, this is very educative, learned a thing or two.
    So, the Fairchild FDD3706 will qualify as a useable FET to be switch loads up to 15Vdc?
    Any other parameters that I should take into account...
  2. Hi Mark, just curious, am I overlooking something...

    Hi Mark, just curious, am I overlooking something in the datasheet? I read this

    21710

    and this

    21711

    that leads me to believe that this MOSFET is OK to be driven by a 3V3 signal reliably.
  3. Hi Gary, For driving relays, buzzers, fans,...

    Hi Gary,
    For driving relays, buzzers, fans, lamps, etc. by a Teensy I usually resort to using an IRLZ44N. Cheap and easy to get. Vgs of this MOSFET is low enough to be driven safely by a 3V3 output...
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    Yes, that's what I read as well when the Drive...

    Yes, that's what I read as well when the Drive Strength (DSE) setting is '111'. But I have no idea what the actual DSE setting is or how/where it can be set.
    I think it's defined in C:\Program Files...
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    Most WS2812/2813 LEDs indeed seem to work OK when...

    Most WS2812/2813 LEDs indeed seem to work OK when fed with a Teensy pin output voltage of 3V3.
    However, it is not guaranteed to work always.
    The spec states 0.7*Vdd for High-level Input Vih. That...
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    You need to get the latest IMXRT1060 datasheet...

    You need to get the latest IMXRT1060 datasheet from the NXP website.
    See the updated table 22 for output currents.

    Paul
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    Yes, just tried it. Here is the setup: 21484...

    Yes, just tried it.
    Here is the setup:

    21484

    Here is what I did in the Audio System Design Tool:

    21485

    Here is the code:
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    With pair I meant Bluetooth pairing. But you did...

    With pair I meant Bluetooth pairing. But you did that obviously.
    The 2 quick flashes are shown when a program connects to the HC-05 module.
    Perhaps you should try the app I used? Serial Bluetooth...
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    Hi Yehuda, Just checked your code on a Teensy...

    Hi Yehuda,
    Just checked your code on a Teensy 4.1 & HC-05 module and it is working fine.
    Teensy pin 7 connects to HC-05 pin TXD, pin 8 to pin RXD.
    Do you power the HC-05 by 3V3 like I did? And did...
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    If I'm correct then images are limited on this...

    If I'm correct then images are limited on this forum to 1280x720 pixels max.

    Paul
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    Correct, Teensy 4.0 & 4.1 do not have an onboard...

    Correct, Teensy 4.0 & 4.1 do not have an onboard DAC.

    Paul
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    Could you post your complete code? And perhaps a...

    Could you post your complete code? And perhaps a photo of your setup?

    When I compile ssd1306_128x64_i2c.ino I do not get any error... Did you install/update the Adafruit library to the latest...
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    Well, at least the display is alive because it...

    Well, at least the display is alive because it reacts to I2C. And apparently it has I2C address 0x3C.
    Did you use this I2C address in your sketch?
    In this sketch: Examples > Adafruit SSD1306 >...
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    If I see the photo correctly than CS [green wire]...

    If I see the photo correctly than CS [green wire] is connected to Teensy pin 15. That should be pin 10. Your code states const int chipSelect = 10;

    Paul
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    Good to hear the GPS module is working now. I...

    Good to hear the GPS module is working now.
    I assume that the SD card error is still Initializing SD card...initialization failed ?
    What SD card shield are you exactly using and how is it...
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    Very strange. To make sure the GPS module is...

    Very strange.
    To make sure the GPS module is working OK, I would try the setup as in the picture below and check if you can run Pete's code in message #7.
    It worked perfect in my setup.

    Paul
    ...
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    Allright. What happens if you only connect VCC &...

    Allright. What happens if you only connect VCC & GND of the GPS module, so without RX & TX wires. Does SD still fail?

    Paul
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    What does "doesn't work" exactly mean? Do you see...

    What does "doesn't work" exactly mean? Do you see "Initializing SD card..." on the serial monitor? Or do you see another message?

    If you only plug in VCC & GND of the GPS sensor and then it fails,...
  19. Huh? Now it's really becoming weird... Some...

    Huh? Now it's really becoming weird...
    Some thoughts:
    1. is there a soldering issue of pin 13?
    2. could the onboard LED on pin 13 be too much load on the SCK signal?
    3. are all the pins on Teensy...
  20. Well, this board is giving you a real fight......

    Well, this board is giving you a real fight...
    Anyway, new information is welcome. Yes, perhaps there is an issue with the PCB.
    Could you measure whether the SCK signal is shorting to other signals...
  21. After all the observations you shared, I now have...

    After all the observations you shared, I now have a feeling that the power supply of the different parts may not be 'strong' enough, meaning not having a low-impedance path to GND or 3.3V. This will...
  22. No need to apologize...as with Kurt, it happened...

    No need to apologize...as with Kurt, it happened to me as well...
    Glad it worked out in the end!
    Success with your project.

    Paul
  23. I was about to say so :-)

    I was about to say so :-)
  24. No problem as the analog sample frequency...

    No problem as the analog sample frequency [2.5MHz] is way too low to capture fast phenomena. Can you set the Saleae to a higher digital sample rate? Perhaps by ommiting analog capture?
    Also 5MHz...
  25. Hi Owen, a quick one before you post logic...

    Hi Owen, a quick one before you post logic analyzer images: could you set the analog scale of all 4 signals to 0-5V?
    Thanks,
    Paul
  26. Those pins are adjacent on the AirLift board......

    Those pins are adjacent on the AirLift board... see here. Solder short?

    Paul
  27. Hi Owen, When I look at the analog readings of...

    Hi Owen,

    When I look at the analog readings of your graph above, it seems there is a short between the MISO [ch 1] and the CLK [ch 2] line?

    Paul
  28. CS is pulled-up with a 10K resistor to Vin [5V]...

    CS is pulled-up with a 10K resistor to Vin [5V] on the AirLift board, see the schematic.
    That should be possible for the Teensy to pull low.

    Paul
  29. Asking the obvious probably but did you exactly...

    Asking the obvious probably but did you exactly wire it up as indicated on the OSC_propShield page?
    Also the code seems OK as far as I can see. I noticed though that you want to print out the MAC...
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    Never built such an adapter, but would this...

    Never built such an adapter, but would this kind of cable do the trick?

    Paul
  31. Yes, perhaps just desolder one of the MAX31855's...

    Yes, perhaps just desolder one of the MAX31855's and go on... :)
    Apart from a possible analog phenomenon, what still intrigues me is the fact that when you comment out the 6 'audio' lines,...
  32. I guess it's time now to borrow an oscilloscope...

    I guess it's time now to borrow an oscilloscope somewhere and check the SPI lines and DC voltages on the different parts for analog phenomena.
    Looking at the schematic again: what is the powersupply...
  33. Just checking again: "everything" means [1] both...

    Just checking again: "everything" means [1] both MAX13855's work and [2] audio input/output works?

    I guess we now have to dig into the nRF24 module and related firmware.

    Paul
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    If I see correctly on the photo, only the TX pin...

    If I see correctly on the photo, only the TX pin of the module is connected to the RX1 pin [pin 0] on the Teensy?
    What about the RX pin on the module connected to the TX1 [pin 1] on the Teensy?
    As...
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    Can you show us how your wiring is from Teensy...

    Can you show us how your wiring is from Teensy 3.2 to the uBlox module, which specific module you purchased and what specific code did not work?
    I saw that 2 pins on the uBlox module need to be set...
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    Hi David, did you see this...

    Hi David, did you see this page?
    And saw this thread? https://forum.pjrc.com/threads/60348-Eagle-library-with-Teensy-4-0-(test)

    Cheers,
    Paul
  37. Hi MarkV, What MarkT is meaning that if you post...

    Hi MarkV,
    What MarkT is meaning that if you post the complete code, either by using the # command or by zipping & attaching your project folder, it is way more inviting for other forum people to...
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    Merhaba! What I usually do in these cases is to...

    Merhaba!
    What I usually do in these cases is to check whether you can get the GPS device to work with the Teensy exclusively, without any other devices attached.
    Start with the basic GPS test...
  39. Yes, there seems to be an issue with...

    Yes, there seems to be an issue with analogWrite(pin, value) function for value = 1 on Teensy 4.
    See also this thread. See PaulStoffregen's explanation and advice in message #14.

    Paul
  40. It changed when Teensyduino was updated from...

    It changed when Teensyduino was updated from version 1.40 to version 1.41.
    See bottom of this page. Here is the actual commit on Github.

    As far as I know, the option you proposed [saving .hex...
  41. Haven't used the TeensyDMX...

    Haven't used the TeensyDMX library used myself but it seems mature, well documented and the author is active on this forum. Perhaps just give it a try?
    Found this thread on the forum where the...
  42. This...

    This thread will help you, since the OP uses the same display.

    Paul
  43. @ Guzu: did you (re)check all the wiring from...

    @ Guzu: did you (re)check all the wiring from connector U6 to the off-board components? I see the SSOLED, SCK and MOSI signals going off-board. If one of those signals short to a neighboring signal...
  44. Are you asking me? I don't have the peripherals...

    Are you asking me? I don't have the peripherals that output data on the MISO line, just the bare Teensy 4.1.
    The OP indicated that he does not have a scope at his disposal.

    Paul
  45. Just checking that we are on the same page... I...

    Just checking that we are on the same page... I also assumed that those 4 lines had to be commented out as well.
    Anyway, no (obvious) changes to the waveforms after compiling, uploading and running...
  46. As far as I understand those 2 lines instantiate...

    As far as I understand those 2 lines instantiate 2 audio objects that you can use for audio input and output. It will probably incorporate a whole bunch of software under the hood. But I'm not...
  47. Just found out that if you download and install...

    Just found out that if you download and install the DSview software, you can then open the attached .DSL file [zipped] below and look & zoom into the captured waveforms yourself!

    Paul
  48. Looked into the Adafruit MAX31855 library and...

    Looked into the Adafruit MAX31855 library and underlying libraries but did not spot a problem.
    So I decided to hook up a logic analyzer and check for collisions on the SPI bus:

    21332

    Took the...
  49. Yep, that's my guess as well. Not sure why...

    Yep, that's my guess as well. Not sure why though. I may look into the Adafruit MAX31855 library and underlying libraries later today.

    Paul
  50. Just checking: do you mean that SPI is now...

    Just checking: do you mean that SPI is now working well with 2 populated MAX13855's?

    Paul
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