[time-nuts] Which First GPSDO to buy?

Joseph Gray jgray at zianet.com
Sun Dec 14 23:53:28 UTC 2014


I have to watch what I'm typing a little closer. I meant to say "You
can't buy the parts this cheap."

Joe Gray
W5JG


On Sun, Dec 14, 2014 at 8:56 AM, Chris Albertson
<albertson.chris at gmail.com> wrote:
> It's not worth making a PCB, not when you can buy the whole thing already
> assembled for $3 with free shipping.  I use these just as if they where a
> single chip and put them in a socket.  See eBay 141505833625 as an example.
>   Those holes are in 0.1 inch centers so you can figure out the size. (I
> get 1.3 inches long.)  direct link
> <http://www.ebay.com/itm/ARDUINO-PRO-MINI-Nano-Pro-Mini-atmega328-Compatible-Nano-5V-16M-/141505833625?pt=LH_DefaultDomain_0&hash=item20f267aa99>
>
> I'll write up what I built.  It would be good to see the range of these.  I
> tried to make mine as simple an low cost as possible without regard to
> anything else.  Just to find the bottom line.  I doubt I would have met
> that gaol by using a bare AVR chip.  That is NOT simple because it requires
> so much more skill from the builder and with an entire working Arduino
> selling for $3 how much could you save?  Actually the chips on that $3
> board cost more than $3. (I don't even see how shipping from China can be
> that cheap.)
>
> On Sat, Dec 13, 2014 at 10:56 PM, Patrick Tudor <ptudor at ptudor.net> wrote:
>>
>>
>> > On Dec 13, 2014, at 9:47 PM, Chris Albertson <albertson.chris at gmail.com>
>> wrote:
>> >
>> > Actually I've added  some features to it like a 2 line by 16 character
>> LCD
>> > display and some status LEDs.  And I can log data to a computer via a USB
>> > cable so it is easy to plot data and it is using my more expansive mast
>> > mounted timing antenna.
>>
>>
>> Just in case any of you like reading Arduino code, for fun or functions to
>> copy-and-paste,
>> the code for my PCB that combines an ATMega328p with an Adafruit GPS and
>> 16x2 LCD to display GPS info as it sends the PPS out the DB9 DCD is at
>> GitHub.
>> It's not exactly, say, measuring oscillator cycles (yet... ) but it's
>> perhaps
>> a good introduction for someone who's never ever before used anything
>> Arduino.
>> (And now that I've done more PCBs with Cypress and FTDI chips, I wish I'd
>> put
>> that straight on my board instead of as a future daughterboard, but,
>> feature creep.)
>>
>> https://github.com/ptudor/jemma-clock
>>
>> PT
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>
>
> --
>
> Chris Albertson
> Redondo Beach, California
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