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

shalimr9 at gmail.com shalimr9 at gmail.com
Wed Oct 5 15:59:57 EDT 2011


This is an interesting product, thank for the link!

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: Jim Lux <jimlux at earthlink.net>
Sender: time-nuts-bounces at febo.com
Date: Tue, 04 Oct 2011 08:40:55 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

On 10/4/11 8:03 AM, Kevin Rosenberg wrote:

> 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.



$29, 4 channel 10 bit ADC with USB  interface

You'll need to cobble up a sensor, of course, and I don't know if the 
resolution of the di145 is good enough (20mV/LSB as I recall) for a 
LM335 (10mV/Kelvin?).  One thing you get with cheap is a +/- 10V full 
scale range.

A thermistor and resistor into the DATAQ might work better.

Maxim/Dallas One-Wire devices are another possibility  There's tons of 
PIC code out there to interface to them.  The sensors are cheap (few 
bucks, depending on whether you buy raw device, or you get one potted 
with a cable)  Sparkfun.com has them, among other places.

There's also a whole raft of USB temperature loggers out there from 
Onset (HOBO) or DataQ or a variety of other companies.  They tend to run 
in the $80 range  (if someone knows about a battery powered temperature 
logger in the under $25 range, I'd love to hear about it)

And, of course, a DMM with a RS-232 interface is another possibility

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