[time-nuts] [Solved] Looking for multiple PPS timestamp logging

Bob Bownes bownes at gmail.com
Tue Oct 4 11:10:07 EDT 2011

On Tue, Oct 4, 2011 at 11:03 AM, Kevin Rosenberg <kevin at rosenberg.net> wrote:
> What I haven't decided is whether to have my son use the 34401A and GPIB
> polling via a Prologix adapter versus a simple MCU firmware using a 2.5V
> reference voltage and a 10-12 bit ADC and outputs the ADC result either
> once a second, or in response to a pulse (probably from the PPS of the XO).
> The first has merits of accuracy and simplicity, but I prefer he use
> more affordable devices than the 34401A in his experiment to even his
> project compared with other students. The latter has the advantage of
> price, but the disadvantage of me writing the firmware (though, the
> firmware is almost trivial). But again, I'd like him to be as
> independent as possible.
> So, if you know of any simple ADC to UART firmwares available, that'd
> be great so he can just reference someone else's code. The picPET
> is a perfect device at the perfect time. But, we can't rely on tvb
> to come up with a 'picADC' at a similarly serendipitous time.

If you need a simple/cheap pollable ADC, there is a Velleman kit
available with USB. Can sample ADC, and a number of discrete inputs as

And it can now be found on the wall at Radio Shack, strangely enough.

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