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  1. Si5351 Sig Gen

    Thanks. Also have a look at the MAX294 audio adapter. I can now generate TCXO controlled audio sine waves.
    https://wb8nbs.wordpress.com/2018/03/24/audio-adapter-for-the-si5351-signal-generator/
  2. [posted] Si5351 Signal Generator with Teensy Controller

    I have several old radios here and thought a signal generator would be a nice Arduino-ish project to help alignment. This is the result:

    12570

    12569

    I used a breakout board with Si5351 and...
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    Thank You! I am finally able to load a sketch on...

    Thank You! I am finally able to load a sketch on the 3.6 I've had for months. My computer is a 32 bit athlon and up until arduino 1.8 would not compile anything, get the dreaded
    SIGILL: illegal...
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    The two Adafruit PowerBoost boards do provide a...

    The two Adafruit PowerBoost boards do provide a seamless switch from incoming USB to battery power. Using one of those, the Teensy is always fed through it's USB jack so your problem does not happen....
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    Wow! I felt bad obsessing over an Iambic keyer...

    Wow! I felt bad obsessing over an Iambic keyer but you guys build whole radios! Put me down for PC boards. Also a suggestion, since you can sweep the DDS, use a bridge and an analog input to graph...
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    I had to do exactly that in mr=y current project....

    I had to do exactly that in mr=y current project. I'm using an Adafruit PowerBoost 500c charger/booster and it does not provide access to the incoming USB data leads. I used their 1390 male connector...
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    I'm building a project with a Teensy3.2 and an...

    I'm building a project with a Teensy3.2 and an LCD. I soldered them directly together using a 3 pin header and a 4 pin header. You need 11 I/O pins in a row to do this, I believe Teensy2.0 has...
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    The TimeTeensy3 sketch calls timeStatus() in...

    The TimeTeensy3 sketch calls timeStatus() in setup to determine if the RTC has ever been set. So I think you have to set the RTC at least once from the PC serial port to get a good status return else...
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    Is there any way to add an external reset button...

    Is there any way to add an external reset button to an LC? Pressing the program button hangs the sketch, is that normal? I'm resorting to power cycling the board which seems crude.
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    I saw that example. Went as far as getting it to...

    I saw that example. Went as far as getting it to compile. Both adrian and I have LC's though and it does not have a PDB.

    And I thought about a switched capacitor filter but decided it was...
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    What does "!Serial" do? Arduino reference says: ...

    What does "!Serial" do? Arduino reference says:



    That would be really good. Is it implemented on the ARM Teensys?
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    Blink does work, if it's loaded while the teensy...

    Blink does work, if it's loaded while the teensy device is showing in lsusb. loading Blink after trying the program that kills the usb device requires a button press.

    Yes, it looks like the...
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    You are about where I was a year ago. It took me...

    You are about where I was a year ago. It took me a couple of months to get something that actually worked. I've concluded that with the tradeoffs, serious DDS is best done in dedicated hardware. With...
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    I don't think you can get that kind of precision...

    I don't think you can get that kind of precision with IntervalTimer and a 48 Mhz processsor.

    You are incrementing the table index by 64 at each interrupt so it goes through the entire table in 4...
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    Same problem with LC

    This is biting me on a Teensy LC right now. (Ubuntu 14.04) I can compile, I get the message
    "did not respond to a USB-based request to automatically reboot.
    Please press the PROGRAM MODE BUTTON on...
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    The Teensy-LC version is working. My notes and...

    The Teensy-LC version is working. My notes and some photos are on my Wordpress page. It makes beautiful sine waves but there are some reservations. I'm coming to the conclusion that DDS is best left...
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    Yes! It had found it's way over to Uno. Thank you...

    Yes! It had found it's way over to Uno. Thank you for the prompt reply.
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    Are you running an older version of the Arduino...

    Are you running an older version of the Arduino IDE? I had the same problem with, I think 1.05. Reasearch said Arduino was using an old version of gcc with a bug. I found this fix, no idea what it...
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    I'll try that. Looking at the data sheet, it's...

    I'll try that. Looking at the data sheet, it's not at all clear how the references work for the DAC.

    The frequency granularity is pretty large with this method. Like if I change the sample period...
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    I'm testing on the Teensy LC. So far so good and...

    I'm testing on the Teensy LC. So far so good and the wave is, as you said, much cleaner. Sketch link is https://dl.dropboxusercontent.com/u/40929640/ArduinoSineSynth/TeensyLCFullTable.zip

    Is there...
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    Thanks Paul. I'll set that up. I also came across...

    Thanks Paul. I'll set that up. I also came across This URL describing how to use the USB clock on the 10 bit timer. I will try that also. I suspect at some clock speed the processor will not have...
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    I'll work my way up to that. i bought a Teensy LC...

    I'll work my way up to that. i bought a Teensy LC to learn a bit about ARM chips but have not used it yet.

    The application is morse code, I expect to limit the tone frequencies to 100-1500 Hz into...
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    Teensy 2 timers

    I got the DDS sine wave working on timer 3. My notes are at https://wb8nbs.wordpress.com/2015/12/08/more-fun-with-direct-digital-synthesis-32u4-and-fast-pwm/
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    DDS Sine Wave on Teensy 2.0

    I have Direct Digital Synthesis working on the 32u4 now in both Phase Correct and Fast PWM modes. Fast works better as the clock rate is twice as fast as Phase Correct.

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    My notes and a...
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    You might as well just sample the +5 volt lead on...

    You might as well just sample the +5 volt lead on the USB connector with a resistor connected to a Teensy digital pin. You would need a higher value pull down resistor on that pin to keep it normally...
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    If it's a one time board, I would cut a...

    If it's a one time board, I would cut a rectangular hole in the PCB to fit the Teensy and solder short wire bridges between Teensey pads and adjacent etched pads on the PCB.
  27. Paul, can you comment on which timers are used by...

    Paul, can you comment on which timers are used by Arduino functions or other libraries in the 32u4 Teensy?
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    Teensey 2 timers

    I want to port a morse code program I wrote for an Arduino Uno to the 32u4. Most of the code won't change excpet maybe pin numbers but I'm using a DDS sine wave generator using the Mega328 timer 2. I...
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