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  1. Replies
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    Check for shorts on board: Measure resistance...

    Check for shorts on board:
    Measure resistance between GND and 5V, GND and 3.3V.
    Power through a 5V power supply, measure voltage between GND and 5V, GND and 3.3V.
    Post your results.
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    I looked for this doc online, and Item 2) seem to...

    I looked for this doc online, and Item 2) seem to be the definition of a "Digital Device" - a device with clock higher than (in excess of) 9khz.
    Item 1) is the regulation for digital devices....
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    I personally never tried this, but if your...

    I personally never tried this, but if your required process can work with 8khz, you probably don't need a teensy (sorry PJRC).
    There are cheaper, smaller and easier to underclock MCU's that could...
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    Maybe your potentiometers are faulty? When teensy...

    Maybe your potentiometers are faulty? When teensy is not recognized, check voltage between 5V and GND, is it 5V? same for 3.3V and GND. disconnect power and check resistance between 5V and GND, 3.3V...
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    Lets say your power (which is provided by the...

    Lets say your power (which is provided by the USB) has a max current output of 170mA (at 5V).
    Assuming each of the LED's takes 20mA X 8 LED's = 160mA "taken" already (160mA are already flowing...
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    What happens if you change the resistors on the...

    What happens if you change the resistors on the switches to a higher value around 1K~100K?
    When the switch is pressed it connects between VCC and GND through the 220Ω resistor, which results in...
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    1,688

    In the datasheet for the 74HC4051 it says that...

    In the datasheet for the 74HC4051 it says that 10nF is the recommended value.
    What is the value of R25? from what I see it is a pull-up resistor but you don't want it to be too small.
    In this...
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    - Yes, this is the way you want to connect it -...

    - Yes, this is the way you want to connect it - and as I said put the capacitor as close as possible to the pins.
    - If there is no problem with the debouce then you don't have to change it from...
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    The decoupling capacitor should only be connected...

    The decoupling capacitor should only be connected between VCC and GND, close to these pins physically.
    A way to confirm that the switches are signed correctly would be to send a serial message to...
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    Please upload a schematic for your design so we...

    Please upload a schematic for your design so we can know what could cause the problem.
    And yes, you should put a decoupling capacitor with 100~10nF On every IC.
    Do you use any sort of switch...
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    Maybe changing to another physical USB port will...

    Maybe changing to another physical USB port will help. What happens if you upload a sketch to the teensy serial port even though an UNO is connected?
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    This is truly an easier approach. Just had to...

    This is truly an easier approach.
    Just had to change almost all ADC-result-related-vars data types to int8_t, and tweak all of the duplication problems by changing the class name to RingBufferDMA2...
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    The DMA option sounds like a good idea. I will...

    The DMA option sounds like a good idea. I will start working on it soon.
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    Thank's for the clarification! currently I can't...

    Thank's for the clarification!
    currently I can't find a way to convert the whole uint16_t[] buffer to a uint8_t[] buffer without the unneeded byte. However changing the encoding of the SerialPlot...
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    Thanks for your quick reply! - I should have...

    Thanks for your quick reply!
    - I should have noticed the buffer type, currently changing to int8_t doesn't compile, probably because the RingBufferDMA does not accept it. I will get into it...
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    Serial Plotting Issue with T3.6

    Hello everyone.
    I am working on a teensy 3.6 based oscilloscope. I know that it will be limited but in the near time I am not going to need anything more than the 1MHz range.
    I already got a...
  17. Thanks for this help! I was in a real "AHA!"...

    Thanks for this help! I was in a real "AHA!" rush, since I have never heard about this Thevenin theory, and It helped me to solve this.
    Firstly, the 2 resistors divider equation:
    13085
    (difference...
  18. Wow... I feel so dumb now that I am designing...

    Wow... I feel so dumb now that I am designing op-amp circuits but can't even analyze this simple 3 resistor circuit... looking at it for an hour and I can't figure out whats happening there. even...
  19. Thanks for the clarification, However in the...

    Thanks for the clarification, However in the simulator, if I apply a sine wave to the input of this circuit with 12V and -12V peaks, the result is a sine wave with 3.07V to -225mV peaks:
    13053...
  20. Thanks for your help! I understand that using...

    Thanks for your help!
    I understand that using op-amps may be an overkill for this purpose, but I kinda lost you in the resistor divider explanation. which is R1 and which is R2? solving the formula...
  21. Thanks for your quick replay! I know about the...

    Thanks for your quick replay!
    I know about the teensy's limitation, that is why I created this circuit.
    The reason I used a 15V power supply is because op amp inputs must stay within the rails, so...
  22. Teensy 3.6 ADC voltage limits increasing with external circuits

    Hello everyone,
    My current project with the T3.6 is a basic oscilloscope, and because the ADC's are only capable of 0V-3.3V measurement, I wondered how I can step down higher (and lower) voltages...
  23. Got it! It turns out that the dmaBuffer_isr()...

    Got it! It turns out that the dmaBuffer_isr() function is being called every time the buffer is full, not when every conversion is done.
    This is the coed that works now and gives me around 790kspS:...
  24. Thanks for your help! I'm using windows 10, but...

    Thanks for your help!
    I'm using windows 10, but anything between 500ksps-1000 will satisfy me and I'm pretty sure It is capable for it.
    thanks for the explanation about the buffer but in the...
  25. Thanks for your replay. I played with the DMA...

    Thanks for your replay.
    I played with the DMA example in the ADC library, but can't find a way to sample faster than 200khz, as the library examples show continuous sampling but not continuous data...
  26. Thanks for the responses. - I would like to use...

    Thanks for the responses.
    - I would like to use the internal teensy ADC, not an external one.
    - I don't care to have 8-10 bit resolution, If it improves the sample rate.
    My main question is what...
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    Had these FFFFFFFF's too in a recent arduino...

    Had these FFFFFFFF's too in a recent arduino project, Filtered them using an IF statement, as well as all of the "unknown" protocol messages.
    Maybe some band-pass R/C filter will get the signal...
  28. Fastest digital/analog input sampling with T3.6

    Hello everyone!
    I started thinking of making a simple logic analyzer/oscilloscope with the Teensy 3.6. (I know It will not be close to a real oscilloscope, but (for the things I'm working on) I...
  29. Even though I think I could manage to change some...

    Even though I think I could manage to change some stuff in the RH_NRF24.cpp file and its related classes, and get it to work on the specific SPI port I need, I will give up for now because this issue...
  30. After more searching I found your SPIN library,...

    After more searching I found your SPIN library, which seems to be able to access different SPI ports.
    Do you think I can rewrite the libraries to use SPIN instead of SPI? Or there is already such...
  31. Because this is a prototype and not the finished,...

    Because this is a prototype and not the finished, optimized product, I will go on the easy way :)
    How can I achive this?
  32. Help with multiple SPI buses and SD card reading

    Hello everyone.
    I'm corrently designing a project which requiers data logging with an SD card and SPI RF transmittion at the same time.
    For the RF transmittion I will be using two of these...
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