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  1. It's just that the limits for Vref are 1.25V to...

    It's just that the limits for Vref are 1.25V to 3.3V (c.f. data sheet). Within these boundaries, the ADC is definitively ratiometric. That's why many users use the 3.3V Vdd reference when reading...
  2. All USB modes should be supported on the T4,...

    All USB modes should be supported on the T4, soon. Paul told that he was working on this but that's not his only high priority, there are a lot of things still to do until the T4 will "turn round"....
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    Just a few thoughts: 1.) A theremin is...

    Just a few thoughts:
    1.) A theremin is characterized (see original US patents by inventor Leon Theremin himself) by sound generation through 2 directly heterodyning RF oscillators. From that point...
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    A quick look into the source code of the I2S...

    A quick look into the source code of the I2S objects of the audio lib will tell you that one frame contains two 32bit words (one per channel). The audio lib does use 16bit audio which means that the...
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    You can’t eat the cow and her butter, as we say...

    You can’t eat the cow and her butter, as we say in France. There are reasons why in high end audio devices, there are separate power supplies, separate grounds and separate shielded sections for the...
  6. Since PlatformIO uses its own build system, I’d...

    Since PlatformIO uses its own build system, I’d rather open the issue with them. Be sure to add your full code base and the reported memory sizes after compiling with the old and with the new build...
  7. The Teensy 4.0 has already something like that...

    The Teensy 4.0 has already something like that integrated. The internal SAI3 can be combined with a so-called Medium Quality Audio Output which works based on PWM/PDM with internal oversampling and...
  8. The ADC library has been written by forum user...

    The ADC library has been written by forum user Pedvide and is on GitHub. Open an issue there.
  9. In France, it's also 11PM. Best time to be...

    In France, it's also 11PM. Best time to be creative ;)
  10. The Teensy has 2 internal ADCs. A very...

    The Teensy has 2 internal ADCs. A very sophisticated internal multiplexer allows to route several pins and signals to either the first ADC, or to the second, or (for some pins and signals) even both....
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    They do. But that's not enough to add all the...

    They do. But that's not enough to add all the additions (and bug fixes and improvements) which Teensyduino brings to Arduino.
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    That workaround (right click the app,...

    That workaround (right click the app, control+click "open") at the first launch does actually apply to almost all apps which aren't distributed through the Apple app store. It's the same with other...
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    Open the freshly downloaded Teensyduino.dmg with...

    Open the freshly downloaded Teensyduino.dmg with a double click:
    17894
    It seems that it can't be installed. But it can. Click "OK". Make a right click on it:
    17895
    Again, as before with Arduino,...
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    OK, re-did everything. The struggle is twice in a...

    OK, re-did everything. The struggle is twice in a similar way, once for Arduino, and once for Teensyduino.
    After unpacking the downloaded Arduino.zip and moving the App into the Applications folder,...
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    I have it running here (Catalina and Arduino...

    I have it running here (Catalina and Arduino 1.8.10 and Teensyduino 1.48) . Install was some days ago. I remember that there was an additional hurdle, but I got over it. Don’t remember details, so...
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    As if this hadn‘t been explained already more...

    As if this hadn‘t been explained already more than 20 times in these forums... The short answer is no. The long answer is that a kind of programmer IC (the famous MKL02/04) is integrated on each...
  17. I guess that nobody tried it out up to now. Thus,...

    I guess that nobody tried it out up to now. Thus, it is like it‘s your turn to do so and report back here ;)

    But be warned, the port might not be trivial since the audio stream object is not in...
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    Running already macOS Catalina 15.1 beta here...

    Running already macOS Catalina 15.1 beta here since last night. Fresh install of Arduino 1.8.10, granted rights, the installed Teensyduino 1.48 final release, not beta. Launches, loads sketches,...
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    You shouldn't make general conclusions from your...

    You shouldn't make general conclusions from your individual problem. Fresh install of Arduino 1.8.10 followed by a Teensyduino 1.4.8 install gives a fully working environment under Catalina 10.15...
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    Received my three 0.8mm breakouts yesterday....

    Received my three 0.8mm breakouts yesterday. Unusable, went directly to trash. The small castellation for the bottom pads 24,26,...,32 simply missing, the big castellation totally misplaced. First...
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    The built-in LED is on pin 13 which is a hardware...

    The built-in LED is on pin 13 which is a hardware capable PWM pin. So you can easily use the Teensyduino core features like analogWrite(), analogWriteResolution(), analogWriteFrequency() without...
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    Perhaps a silly thought from my side: The Teensy...

    Perhaps a silly thought from my side: The Teensy 4 has 4 flexpwm modules with 4 independent sub modules which have 3 independent channels, each. That makes already 48 hardware PWM channels. Then,...
  23. All data sheets and reference manuals for the...

    All data sheets and reference manuals for the different processors are here: https://www.pjrc.com/teensy/datasheets.html
    I'd not rely on the weak internal protection and add the diodes. And yes,...
  24. Yes, you wanted to use touchread() which uses the...

    Yes, you wanted to use touchread() which uses the native touch pins through the TSI engine. So, my reply above should answer your question.
  25. No! As you can see in the reference manual, the...

    No! As you can see in the reference manual, the Kinetis touch engine (TSI) works with switched constant current sources and charge/discharge thresholds for pure capacitive detection. Series resistors...
  26. Everything depends on how much current you draw...

    Everything depends on how much current you draw from the voltage regulator. The total power dissipation in the voltage regulator is roughly (Vin - Vout) / Iout. Vout is 3.3V, Iout is the current...
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    I fear already that mine will look the same when...

    I fear already that mine will look the same when they’ll arrive here in France in a few days... Why don’t they use a precise laser to do the cut-outs?
  28. For audio, I2S is the preferred digital protocol,...

    For audio, I2S is the preferred digital protocol, and many DACs exist on the market which support it. So, I’d say this is the way to go.
  29. And if it was (for whatever reason) that specific...

    And if it was (for whatever reason) that specific Teensy? Did you try to take a fresh one out of your dev drawer for a differential diagnose? How do the serial signals look on an oscilloscope? Post...
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    The problem with your approach is (and that's why...

    The problem with your approach is (and that's why I called it crippled) that the filter corner frequency would remain constant for a certain time while the LFO would remain in move. Which can...
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    Why cripple a working algorithm if you might be...

    Why cripple a working algorithm if you might be able to make intelligent choices about the filter center frequency and the octave hub to limit the max fc to 10000Hz?
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    Which filter type are you using? State variable...

    Which filter type are you using? State variable filters (Chamberlin) work only well up to fs/6 without or fs/3 with 2x oversampling while Biquad filters have coefficient precision problems in the low...
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    I meant the unofficial forum rule: I f there...

    I meant the unofficial forum rule: I f there isn’t a library which fits your needs, study the processor’s reference manual, then write the library yourself, and contribute the result here. I gave you...
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    AFAIK, the encoder lib does not benefit from the...

    AFAIK, the encoder lib does not benefit from the optimized hardware modules inside the T4. It works in the arduino way by attaching interrupts to GPIO pins and digital read operations which...
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    Look, we have a forum rule on top of each page...

    Look, we have a forum rule on top of each page here: "Always post complete source code & details to reproduce any issue!"

    That means that as long as we do not know how you wired your display and...
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    I’d suggest using a touch screen like for example...

    I’d suggest using a touch screen like for example the Nextion 5” or bigger HMI. This allows you to create as many virtual pots, switches, and so on as you need, organize them in pages as it makes...
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    That depends on the data rate (higher switching...

    That depends on the data rate (higher switching rates require more charging/discharging current for parasitic capacitances). Details are given in the iMXRT1062 data sheet which can be found together...
  38. Initially, the original asthmatic Arduino UNO...

    Initially, the original asthmatic Arduino UNO with its huge PCB was sold for 29€ ($32) in Europe. From which I conclude that neither price nor PCB surface barriers exist. I admit that the Teensy’s...
  39. When it comes to video, things are rather about...

    When it comes to video, things are rather about speed than about resolution. Simple analog VGA has already 480 lines times 640 pixels and that at a refresh rate of 60Hz which (when adding some...
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    Hi WMXZ, that's already a good information, thank...

    Hi WMXZ, that's already a good information, thank you. For a specific application I'd prefer having the default power state = off when external power is applied, even with no coin cell connected....
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    Question re: T4 ONOFF pin

    The reference manual tells about timeouts etc. but there is no explanation how I can for example make sure that the T4 does NOT immediately boot when powered up, so that the ONOFF button (wired to...
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    I don’t plan to use the USB host for the moment,...

    I don’t plan to use the USB host for the moment, thus a non-issue for me...
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    Just ordered. Added 2 purple Teensy4.0 and got...

    Just ordered. Added 2 purple Teensy4.0 and got free shipping to France :)

    Planning to solder the default T4 pins from the bottom side to keep it breadboard compatible, and the outer pin rows from...
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    I’m currently trying in my extremely rare free...

    I’m currently trying in my extremely rare free time (advancing slowly) to get SAI1 running in 4 audio channel (2 I2S_TX channels) mode. I think that in the end, it will be simpler than synchronizing...
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    Apparently, you didn’t read the full...

    Apparently, you didn’t read the full documentation of the AudioInputUSB object in the right sidebar of the audio design tool:
    USB input & output does not cause the Teensy Audio Library to update. At...
  46. I second TelephoneBill. DPLL applications may...

    I second TelephoneBill. DPLL applications may require DAC(s).
  47. Man, read, man.... As the error messages clearly...

    Man, read, man.... As the error messages clearly state, Teensyduino 1.47 isn't compatible with Arduino 1.8.10.

    You have two options:
    Either uninstall Arduino 1.8.10 and install 1.8.9 before you...
  48. Rather time to order a 11 logic analyzer...

    Rather time to order a 11 logic analyzer (chinese SALEAE clone) and do systematic debugging based on facts, not on guesses and suspicions...

    Free next day delivery with Amazon prime:...
  49. If Paul wants to stay with NXP, the next Teensy...

    If Paul wants to stay with NXP, the next Teensy risks to be without DACs, too. From looking at their actual CPU offer, it looks like they are rather about to deprecate the analog modules. Already...
  50. No, there is most probably no settings issue with...

    No, there is most probably no settings issue with the Arduino IDE. But if you want to send debug output to the serial monitor in the IDE, you'll have to add Serial.begin(9600) before...
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