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  1. Replies
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    Well, in that case you need to install the...

    Well, in that case you need to install the following 2 libraries: Adafruit_GFX & Adafruit_SSD1306.
    Those libraries run on Teensy 4.0.

    Paul
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    Hi Joris, We need little bit more info in order...

    Hi Joris,
    We need little bit more info in order to help you.
    Could you post the sketch you are using? What exact display are you using? [see also the Forum Rule on top of this page...]
    BTW: you...
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    What type of OLED do you have? With the SSD1306...

    What type of OLED do you have? With the SSD1306 controller? I2C or SPI? With the correct library these OLEDs are supported on Teensy.

    Paul
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    I know EoL well, I should have said...

    I know EoL well, I should have said end-of-its-life... :-)
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    That's the DMG2305UX, a P-channel enhancement...

    That's the DMG2305UX, a P-channel enhancement mode MOSFET that is setup to function as a low voltage drop diode. It carries the 5V USB voltage to the 3V3 regulator. That FET should not get hot at...
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    The problem is that little wire that you removed...

    The problem is that little wire that you removed from the board. That could have been around the board anywhere and may have shorted out some other lines with a failing board as result. Normally this...
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    Oops, sorry, I mixed up Teensy 3.2 and Teensy...

    Oops, sorry, I mixed up Teensy 3.2 and Teensy 4.1. The chip that is running hot is the MKL02Z32VFG4, the so-called Bootloader chip.
    That chip should not get hot as far as I know.
    Please forget the...
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    Before concluding that the regulator and/or board...

    Before concluding that the regulator and/or board is killed, you could do 2 more tests:
    1. with the USB cable connected measure the voltage between the 3V3 pin [marked "3V" on the PCB] and GND pin....
  9. Too bad... For now I'm out of ideas [except for...

    Too bad...
    For now I'm out of ideas [except for start measuring voltages and waveforms using the schematic of the T41].

    Paul
  10. Did you perhaps also do the "Restore Program" as...

    Did you perhaps also do the "Restore Program" as described on this page? It also applies to a Teensy 4.1.

    Paul
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    Is the top of the package of the chip in the...

    Is the top of the package of the chip in the yellow circle nicely flat? It looks like a little bulge is sticking out. If so, then the regulator might be killed.

    21271

    Paul
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    The little wire in the red circle is not supposed...

    The little wire in the red circle is not supposed to be there:

    21270

    Paul
  13. Well, you did all the actions you would normally...

    Well, you did all the actions you would normally do with such a problem.
    It seems like the DC voltages onboard the T41 are OK.
    I can think of 2 more things:
    1. Can you visually check whether all...
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    Is it perhaps possible to send a close-up photo...

    Is it perhaps possible to send a close-up photo of your board?

    Paul
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    First I would do a visual inspection using an...

    First I would do a visual inspection using an optical magnifier. Check for loose/missing/shifted/misplaced components. Also check for tiny solderballs/metal particles anywhere that may short signal...
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    The project is built around a Teensy 2.0. See...

    The project is built around a Teensy 2.0. See here.

    Paul
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    You may want to check out this ...

    You may want to check out this thread.
    Most probably something [bad solderjoint?] is shorting the 3V3 output.

    Paul
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    You don't need to use resistors between the...

    You don't need to use resistors between the Teensy outputs and the 74HCT244 inputs.
    The 220Ω seems OK according to the MIDI Org spec:

    21244

    But you need to connect pins 1 & 19 of the 74HCT244...
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    After a night's sleep, I would suggest to use...

    After a night's sleep, I would suggest to use resistor values of 2kΩ and 3k3Ω first and then measure the voltages.

    Paul
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    Hi David, The 30V mentioned in the datasheet...

    Hi David,

    The 30V mentioned in the datasheet can be a bit confusing.
    Since the output circuitry of the Notch is basically an open-collector output, someone could add an external pullup voltage up...
  21. Your assumption is correct: MOSI + SCK (11 + 13)...

    Your assumption is correct: MOSI + SCK (11 + 13) or MOSI1 + SCK1 (26+27).
    Both work, I just checked on a Teensy 4.1.
    BTW, formally you should use a 3V3>5V levelshifter for the clock & data lines...
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    Since you verified that all power is present on...

    Since you verified that all power is present on the SGTL5000 [please recheck], next step would be to check whether the I2C bus is up.
    Run the I2Cscanner and check for I2C device found at: 0xA.
    Mind...
  23. Hi Jay, Both your attachments return this when...

    Hi Jay,
    Both your attachments return this when clicked on:
    21123

    On topic: I think we are getting closer. What you want seems theoretically possible, but the question is how to realize it.
    I...
  24. Hi Jin, This is an old animal but you can still...

    Hi Jin,
    This is an old animal but you can still buy them on Ebay: Philips TDA1543. DIP 8 package and I2S input.

    Paul
  25. Hi Jay, I've been digging further on your wanted...

    Hi Jay,
    I've been digging further on your wanted USB input volume control.
    What you are looking for is the "Feature Unit Descriptor" [para 4.3.2.5 of the USB spec for Audio Devices].
    I googled for...
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    Hi John, nice job! You will definetely attract...

    Hi John, nice job! You will definetely attract attention with this fancy sousaphone!

    Cheers,
    Paul
  27. Thread: Latency Teensy 4

    by PaulS
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    Maybe these links help?...

    Maybe these links help?
    https://www.pjrc.com/midi-to-control-voltage-converter/
    https://forum.pjrc.com/threads/48765-posted-(yet-another)-MIDI-to-CV-Converter!

    Paul
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    You may want to thank the other Paul ...

    You may want to thank the other Paul for the awesome work...he is the P in PJRC.
    Yep, NXP's CMOS Sensor Interface (CSI) is not the same as the MIPI Alliance's Camera Serial Interface (CSI).
    ...
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    Hi, You may want to have at a look at the...

    Hi,

    You may want to have at a look at the smaller OmniVision image sensors here.
    Look for interface type "DVP" [Digital Video Port]. The control bus used by OmniVision is called "SCCB" [Serial...
  30. Thread: Latency Teensy 4

    by PaulS
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    Hi Jens, I take it you are referring to audio...

    Hi Jens,

    I take it you are referring to audio digital signal processing?
    If so, have a look at this page [and subpages]: https://www.pjrc.com/teensy/td_libs_Audio.html.
    On the "Creating New...
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    I wouldn't be surprised if that is indeed a...

    I wouldn't be surprised if that is indeed a problem. The datasheet is pretty insisting on that point:

    21088

    21089

    The pad may not only be there for thermal reasons but is probably also a...
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    Hi Kurt, Thanks for bringing this up. But it...

    Hi Kurt,

    Thanks for bringing this up. But it also got me confused with respect to Wire.setSDA/setSCL.

    If I understand correctly there are 3 I2C buses on Teensy 4.x and have to be invoked as:
    ...
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    True, but here ...

    True, but here is some useful info.

    Paul
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    The chip is an LP38691 ...

    The chip is an LP38691 low drop regulator supplying 3V3 to the board:

    21033

    This regulator is supposed to have Thermal Overload Protection so catching fire is...interesting?
    Perhaps a higher...
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    Hi Kevin, Mark is right, read this ...

    Hi Kevin,

    Mark is right, read this for more background.
    Using an N-channel logic-level MOSFET like the affordable IRLZ44N is a much better option to switch 12Vdc by a Teensy. More info here.
    ...
  36. Yes, it's a level-shifter but is used for...

    Yes, it's a level-shifter but is used for handling input voltages larger than its power supply voltage.
    From the datasheet:

    20955

    The problem with this level-shifter is the property in the red...
  37. Hi Charles, What you are looking for is a...

    Hi Charles,
    What you are looking for is a so-called level-shifter. See this one for example: https://www.adafruit.com/product/1787. A HEF4050B won't work properly.
    You will need to power the chip...
  38. Yes, it does work here: 20929 But no option...

    Yes, it does work here:
    20929

    But no option to output at 11025Hz sample rate.

    Paul
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    Do you happen to have an oscilloscope? If so,...

    Do you happen to have an oscilloscope? If so, then upload the Examples>Wire>Scanner sketch to your Teensy 4 and check for activity on pins 18 & 19.
    For this quick test you can even omit the usual...
  40. I wonder if it is possible at all to tell the...

    I wonder if it is possible at all to tell the source to attenuate the output signal before sending out.
    In your case you would like to send out a control signal to the Teensy to attenuate the mic...
  41. @PaulStoffregen: Indeed, nothing to fix here....

    @PaulStoffregen: Indeed, nothing to fix here.
    Out of curiosity I checked the slider versus volume values on Windows 10.
    Microsoft updated the conversion. It now looks more like the correct...
  42. Looking further into the jerkiness of the walking...

    Looking further into the jerkiness of the walking dot, I shot a short video at 60fps and played it frame-by-frame using PotPlayer. Use 'D' key [backward 1 frame] or 'F' key [forward 1 frame].
    You...
  43. Hi FinleyOderSo, I compiled and ran the code...

    Hi FinleyOderSo,
    I compiled and ran the code you showed in msg #1.
    The sketch runs but the walking dots do not walk smoothly and you see regularly other LEDs light up very shortly. A full...
  44. Yeah, I missed this...

    Yeah, I missed this...
    Changed DATA_PIN to 1 and now it works:

    #include <WS2812Serial.h>
    #define USE_WS2812SERIAL
    #include <FastLED.h>

    #define DATA_PIN 1
    #define NUM_LEDS 1
    #define...
  45. Thanks houtson, but modifying my basic sketch...

    Thanks houtson, but modifying my basic sketch above to:

    #include <WS2812Serial.h>
    #define USE_WS2812SERIAL
    #include <FastLED.h>

    #define DATA_PIN 7
    #define NUM_LEDS 1
    #define...
  46. Solved by easy workaround

    After more digging on the Internet, found this post on Reddit [Chemdoc77 is also a forum member here].
    Apparently you have to setup FastLED as if it operates in Parallel Output Mode.
    Now my basic...
  47. Since I would like the FastLED library to run on...

    Since I would like the FastLED library to run on a Teensy 4.0 as well, I did some more tests.

    First I upgraded to Arduino 1.8.13, TeensyDuino 1.53 and Windows 10.
    Subsequently installed FastLED...
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    Hallo Marius, Here are some more ON-times...

    Hallo Marius,

    Here are some more ON-times using the sketch from msg #9:
    3 ~13ns
    4 ~20ns
    32 ~206ns
    62 ~406ns
    63 ~416ns
    64 ~416ns
    65 ~416ns
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    Hallo Marius, Thanks for your detailed...

    Hallo Marius,

    Thanks for your detailed explanation. You may even consider using a 74AHCT04, this part has a rise & fall time ≤3ns.
    Just out of curiosity, I checked the waveform on pin 15 using...
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    Indeed, the rise and fall times of the LS07 are...

    Indeed, the rise and fall times of the LS07 are to slow to propagate the short pulses when intensity is set to 1 or 2.
    On the rather high PWM frequency: I assume the 2.343750 MHz has been chosen to...
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