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  1. Looks like all should be that simple, the crystal...

    Looks like all should be that simple, the crystal should be removable using the same method as it is right next to the edge on all. Keeping in mind the 4.0 uses a 24MHz crystal.
  2. Removing the crystal oscillator from a Teensy 3.0...

    Removing the crystal oscillator from a Teensy 3.0 board was surprisingly easy.

    I wasn't trying to save the XO, so I just put a big screwdriver tip in my soldering iron, turned it up to 800F/425C,...
  3. I check for any shorts to ground by just setting...

    I check for any shorts to ground by just setting all 8 pins to INPUT_PULLUP and checking to see that all measure HIGH.

    Check for shorts between pins by setting all pins to OUTPUT and setting LOW,...
  4. Thanks, Theremingenieur. By the principle of...

    Thanks, Theremingenieur.

    By the principle of try it and see, the touchRead() function returns 65535 when it times out by short, or presumably too high a capacitance. My worst case cable reading...
  5. For a four wire cable with ground shield, I will...

    For a four wire cable with ground shield, I will be testing for open, and/or wires shorted to other wires, or to ground. The short or open always happens in the connector body, never along the cable....
  6. Thanks for the tips, I will look that up. In...

    Thanks for the tips, I will look that up.

    In case anyone looking up touchRead() finds this, I found this on the Kickstarter page for the Teensy:
    ...
  7. Thank you. I saw your answer, I posted that and...

    Thank you. I saw your answer, I posted that and then realized I had a lot more questions and should start a thread. Although there, I was not clear what I meant.

    With this project, I'm fine with...
  8. Well... then the answer is yes, I can use a pin...

    Well... then the answer is yes, I can use a pin for both. Of course I don't mean at the same time. I mean within a program, I can use a pin as an IO pin, then with touchRead(), then as an IO pin,...
  9. Cable tester using touchRead() pins for other functions

    I am having a hard time finding some information on touchRead(). It appears simple enough to use, just insert the pin number in there and it spits out a value.

    1. It returns the value in units...
  10. Can I use a touchRead() on a pin, and use it as...

    Can I use a touchRead() on a pin, and use it as an IO pin?
  11. In my continual search for unnecessary accuracy...

    In my continual search for unnecessary accuracy and a tidal wave of information from members here, the EEVBlog forums, and a variety of places around the web, I think I have two paths:

    Use a...
  12. OK, so the maximum frequency out of these GPS...

    OK, so the maximum frequency out of these GPS modules is 10MHz. The internal clock, I'm led to believe, is 48MHz, so an even division of that should be cleaner.

    There is a PLL clock multiplier,...
  13. An idea occurred to me today. I thought I'd check...

    An idea occurred to me today. I thought I'd check and see how accurate the clock in a GPS module is when it is not locked to satellites. I noticed that the NEO-7N and NEO-M8N and NEO-M8Q GPS...
  14. TelephoneBill That is true, however, this would...

    TelephoneBill That is true, however, this would require that I always have a GPS lock.

    Theremingenieur On some level, I'm chasing accuracy for its own sake. However, that -1ppm is only a measure I...
  15. TelephoneBill, yes, that is a good post. I am...

    TelephoneBill, yes, that is a good post. I am very interested in the information there on changing the registers on the chip to adjust the oscillator.

    Although if I can remove the crystal without...
  16. I've not removed a surface mount component this...

    I've not removed a surface mount component this challenging before. I do have a preheater (that hot fan the board sits on) and a rework hot air gun. Maybe a tiny nozzle and the preheater...

    Thank...
  17. My apologies, wrong area of the forum. Moved...

    My apologies, wrong area of the forum. Moved here:
    https://forum.pjrc.com/threads/55545-Teensy-3-6-crystal-accuracy-and-how-to-improve-it?p=201517#post201517
  18. Teensy 3.6 crystal accuracy and how to improve it

    I'm not new to electronics, but I am fairly new to Arduino and very new to Teensy.

    For my first real project, I'm working on this in stages. The plan is start with a frequency counter with a GPS...
  19. Teensy 3.6 crystal accuracy and how to improve it

    I'm not new to electronics, but I am fairly new to Arduino and very new to Teensy.

    For my first real project, I'm working on this in stages. The plan is start with a frequency counter with a GPS...
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    Would it be simpler to replace the crystal that...

    Would it be simpler to replace the crystal that is +-25ppm stability, +-15ppm tolerance with a TCXO that is +-2.5ppm stability, +-1.5ppm stability?
    ...
  21. Replies
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    So it sounds like the key is to use a fast ADC...

    So it sounds like the key is to use a fast ADC chip with a large fast FIFO memory chip. Then the microcontroller can get the data back out at its own speed.

    I'm looking to make something like a 10...
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