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  1. Replies
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    @John: Thanks for sharing your schematics! (I...

    @John:
    Thanks for sharing your schematics! (I could only open this with my PC today, not with the mobile phone.)
    I own some LND150. But up to now I have only had these in mind for high voltage...
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    Well, I meant: If you go through a 16bit System...

    Well, I meant: If you go through a 16bit System and then into a higher gain device, you will hear noise. At least this is my own experience with the Teensy 16bit audio.
    I own 24bit devices, which...
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    Thanks, John, for sharing this! I would be...

    Thanks, John, for sharing this!
    I would be interested in the schematics of your input preamp.
    I am thinking about some similar thing but for guitar. When I did some experiments some time ago, I...
  4. Thanks, BJB, for pointing me at 'apparent...

    Thanks, BJB, for pointing me at 'apparent electrical conductivity', sometimes the knowledge of the right words is extremely helpful.
    I have bought some graphite mines for pencils diameter 2mm. I...
  5. Dry Out Experiment with NPN Transistor Sensor for Thermal Conductivity

    Dry out experiment using the sensor as described in first post.
    A volume (104 grams) of garden soil (dark humus) straight from the garden, as is was, was put into a paper basket (for fruits) and the...
  6. Thank you, Phil for your comments. I can...

    Thank you, Phil for your comments. I can understand and follow your comments very well. Last year I even gave up with microcontrollers and used a system called Blumat, which worked more or less but...
  7. Soil Moisture Sensor based on Heat Capacity

    Hi,
    this is about monitoring soil moisture for plants, perhaps with the aim of controlling an irrigation pump for my next tomatoes.

    Last year I invested a lot of time with capacitive moisture...
  8. Hm, yes, you are totally right. :-) I did...

    Hm, yes, you are totally right. :-) I did overlook this cap in the schematic.
    ... and pin 15 is clearly explicitly recommended in https://www.pjrc.com/store/display_ili9341_touch.html.

    It is...
  9. Hi, I have a Teensy 4.1 with audio board and...

    Hi,
    I have a Teensy 4.1 with audio board and ILI9341 attached. I fought with the system not working and read the thread completely. I want to report, that the system only worked after I switched...
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    I did not really think, that you would jump onto...

    I did not really think, that you would jump onto this idea using "weird" Forth here. :-)

    (( I have discovered, that if I use a simple way of local variables in Forth and if I use normal structured...
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    ...thinking of it... I could indeed...

    ...thinking of it...

    I could indeed contribute to the idea or a variation of it myself: If pjrc would want to ship T4.1 with a preloaded Forth as a bonus for every customer, which would just...
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    @Frank, no problem! Best regards from Esslingen....

    @Frank, no problem! Best regards from Esslingen. I just was not too happy, because I think the idea is not completely silly and because it takes some time for me to write - especially in English.
    ...
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    Thank you both for the explanations. The idea...

    Thank you both for the explanations.
    The idea was: To ship the T4.1 with the SD-Bootloader already flashed to every customer.
    For myself I can flash the Teensy and I can load an application written...
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    Well, Frank, you answered negative within 4...

    Well, Frank, you answered negative within 4 Minutes to my idea, saying that there is no need for it, this felt to me like "crushed down". Have you been part of a group doing brainstorming in the...
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    Start the Teensyloader. - Up to now I have...

    Start the Teensyloader. - Up to now I have installed Arduino first and then Teensy with all its compiler and libraries. Ok, I found now, that there is indeed a "Loader-Only-Installation." Good to...
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    Shipping with a Bootloader for SD-Card ??

    Hi,
    at the moment I have a project, which is of some interest for people, who are not familiar with programming, but do some electronics. T3.5 or now T4.1 is used and a SD card is used too.
    ...
  17. Thank you very much, Frank, this works....

    Thank you very much, Frank, this works.
    (Although I don't feel very comfortable, when I write to a register and don't have any idea, what I am doing there... :-) )
  18. Where to find info on Software Restart for T3.5/3.6/4.1?

    Hi,
    there are some threads about software restart, but I could not see, which will lead to an easy way to just do it with T3.5/3.6/4.1 using Arduino IDE.
    I just need a function which will restart...
  19. Hi, Thank you very much for all the replies!...

    Hi,
    Thank you very much for all the replies!
    Gives me input to think.
    The signal of an electric guitar has a very wide range of voltages. The amplitude can be up to perhaps 1V. And if you want to...
  20. Non- linear adc dac, and floating point audio library?

    Hi, I am thinking about something and would be glad to hear some input about it.

    I have done some project which uses teensy 3.6 together with the audio board for guitar effects.
    It turns out,...
  21. Hi, As you have written, these are simple...

    Hi,
    As you have written, these are simple functions. I think it might be easier not to use a microcontroller at all.
    You can buy blink diodes.

    The Transistors have to be able to handle the...
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    Whow, did not know, that the Hardware fifo is...

    Whow, did not know, that the Hardware fifo is 64bytes. In former times these have been only 2 bytes. Wanted even to suggest an extra dedicated teensy to handle this. Rts cts? There seems a lot going...
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    Hi, Can you reduce the baud rate? Perhaps it...

    Hi,
    Can you reduce the baud rate?
    Perhaps it might help to draw a timing diagram for all the tasks that have to be done.
  24. Hi, Perhaps a noise gate might be helpful. ...

    Hi,
    Perhaps a noise gate might be helpful.
    https://forum.pjrc.com/threads/56917-Controlling-Analog-Guitar-Efects-with-Teensy-Hybrid-Multi-Fx?p=210093#post210093
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    Hi, I do not think, that the amount of...

    Hi,
    I do not think, that the amount of information provided is sufficient to give an answer.
  26. Hi, Have you already tried more damping? For...

    Hi,
    Have you already tried more damping?
    For the sake of speed, this library works only with 16 bits, so yes the resolution is limited. I would assume, that some clipping is a good compromise...
  27. Controlling Analog Guitar Efects with Teensy - Hybrid Multi Fx

    Hi,
    The question was: How could you control Guitar Effects using a controller. Of course this makes even more sense, if you can combine the analog effects with the digital audio capabilities of...
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    16915 16916 Hi, perhaps this works? Best...

    16915
    16916

    Hi, perhaps this works?
    Best regards Christof
  29. Hi, having the same problems, I just wanted to...

    Hi,
    having the same problems, I just wanted to thank timo42 for the input:
    The delays solved the problem!
    "delayMicroseconds(1); // CS_n falling to first capture clock: >= 1 us"

    :-) Christof
  30. Hi tschrama, thanks for the replies! Linear...

    Hi tschrama,

    thanks for the replies! Linear sweep would be very easy to implement.

    As the sample frequency is 250kHz, you could go well over 20kHz. This high frequency signal would not look...
  31. Test Tone Generator, log frequency sweep, Grid Generator 250 kHz sample frequency

    Hi,
    this might perhaps be interesting for some guys working on audio projects.

    It is a testtone-generator which can do logarithmic frequency sweeps. If you have a 2-channel oscilloscope, then the...
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    Hi, Thanks to pjrc and the guys who have made...

    Hi,
    Thanks to pjrc and the guys who have made all the libraries. I just want to say, that the clock works completely stable for some months now 7/24.
    😊 Christof
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    ... tried to correct orientation of the image....

    ... tried to correct orientation of the image....
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    Making a Cuckoo-Clock with Teensy

    Making a Cockoo-Clock with teensy.

    Hi, perhaps this is an idea for a project of some other people. At least I had some fun with itů

    A cockoo clock is a clock hanging at a wall. It has a small...
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    Hi, and thanks again. your input helped to...

    Hi, and thanks again.
    your input helped to modify an existing library:
    https://forum.pjrc.com/threads/53122-DCF77-and-module-Which-library-is-working

    This actually works with "attachInterrupt()...
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    Hi, I managed to solve the question: At ...

    Hi,
    I managed to solve the question:
    At
    http://thijs.elenbaas.net/2012/04/arduino-dcf77-radio-clock-receiver-library/
    is a description of his library, which is also on:...
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    Thank you very much, Paul and manitou, for your...

    Thank you very much, Paul and manitou, for your inputs! I will try the attachinterrupt and micros() approach first and see if this works good enough for this project.
    Christof
  38. Replies
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    Howto use timer capture mode? Teensy 3.5

    Hi,
    According to the data sheet it must be possible to create the following:
    Set up a timer to capture mode at rising and falling edges of an input. (Goal is to measure pulse length.) And to have...
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    OK, this is working and can decode the hours and...

    OK, this is working and can decode the hours and minutes:

    // Funktioniert mit Teensy 3.6
    int DCF77_pin = 2;
    #define DCF77_POWER 28 // PIN to switch on the module
    int DCFSplitTime =...
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    OK, now I found ...

    OK, now I found
    http://muck-solutions.com/?page_id=1637

    I can compile the following code and I get a blinking LED with 1 Hz (as far as I can see):

    #include <DCF77.h>
    //#include <Time.h> //...
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    DCF77 and module - Which library is working?

    Hi, has anyone managed to synchronise time on Teensy 3.6 with a module DCF77?

    I am using a module from pollin and I am able to get some signal from the module with this very basic test program:
    ...
  42. Visual Audio tool suggestions: Comments and User Modules

    Hi,
    the given audio modules and the graphical tool are great!!!

    1. A suggestion: Include some User Module blocks into the gui tool. UserA, UserB, UserC.... Each of these blocks should have...
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    Hi, is this "AudioSampleSnare.h" in the same...

    Hi,
    is this "AudioSampleSnare.h" in the same folder as your *.ino?
    Best regards, Christof
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    Hi blackaddr, yes, perhaps I will post the code,...

    Hi blackaddr,
    yes, perhaps I will post the code, when I am somewhat more happy with the result. I was still fighting with a user interface. It consists of a potentiometer, used like a joystick, a...
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    Thanks for the answers! Now I had some time to...

    Thanks for the answers!
    Now I had some time to simply try the differential input and it does not help.
    I had thought, that there was perhaps a path for the noise over the power lines to the adc....
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    Hm,Paul,at least I don't understand, why this...

    Hm,Paul,at least I don't understand, why this should help here. I thought, that this would help against 50 or 100 Hz hum.
    Best regards, Christof
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    Makes Idea of differential input sense?

    Hi,
    using the 16 bit audio shield and having some noise trouble. For example a serial line to a serial lcd can be heard.

    Now I wonder if it would make sense for example to couple the second line...
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    Sorry, better to do it quick and dirty instead of...

    Sorry, better to do it quick and dirty instead of not doing it at all....

    I am not familiar with the dsp-instructions of this CPU M4 so I cannot do it better quickly.
    :-) Christof
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    Thank you for the inputs! Sometimes one only...

    Thank you for the inputs!
    Sometimes one only needs to know the right words to google. "Recursive 1st order filter" was helpful! I found:...
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    Guitar Tube Amp Simulation Setup

    Hi,
    perhaps this is interesting for anybody.

    12346

    It is a guitar-amp Simulation-work in progress. It can be used to Play electric guitar together with a headphone or hifi stereo amplifier....
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