current crop of GPS receivers for Rpi/Beaglebone for NTP server/etc
I have beagles, but others have pis.
There seem to be dozens of GPS receivers out there in a variety of form
factors.
What's the current "best" inexpensive choice for run of the mill
time-setting/1pps that's a "catalog" item
Plenty of online "how-to" from 2013 and 2014, but we here on the list
know that the "cheap GPS" receiver business is a very moving target - 4
years is a long time.
I have beagles, but others have pis.
There seem to be dozens of GPS receivers out there in a variety of form
factors.
What's the current "best" inexpensive choice for run of the mill
time-setting/1pps that's a "catalog" item
Plenty of online "how-to" from 2013 and 2014, but we here on the list
know that the "cheap GPS" receiver business is a very moving target - 4
years is a long time.
---===========
Jim,
One example - Uputronics use the latest GPS devices from u-blox which
incorporate Galileo support. Available from US and UK sources:
https://v3.airspy.us/product/upu-rpigps/
https://store.uputronics.com/index.php?route=product/product&product_id=81
Cheers,
David
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv
Jim,
When I don't want to fuss with anything fancy I use these:
https://www.adafruit.com/product/746
https://www.parallax.com/product/28511
https://www.parallax.com/product/28509
https://www.sparkfun.com/products/12751
/tvb
----- Original Message -----
From: "jimlux" jimlux@earthlink.net
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Monday, October 16, 2017 6:45 AM
Subject: [time-nuts] current crop of GPS receivers for Rpi/Beaglebone forNTP server/etc
I have beagles, but others have pis.
There seem to be dozens of GPS receivers out there in a variety of form
factors.
What's the current "best" inexpensive choice for run of the mill
time-setting/1pps that's a "catalog" item
Plenty of online "how-to" from 2013 and 2014, but we here on the list
know that the "cheap GPS" receiver business is a very moving target - 4
years is a long time.
Le 16 oct. 2017 à 15:45, jimlux jimlux@earthlink.net a écrit :
I have beagles, but others have pis.
There seem to be dozens of GPS receivers out there in a variety of form factors.
What's the current "best" inexpensive choice for run of the mill time-setting/1pps that's a "catalog » item
Best I don’t know, but I have used Adafruit’s Ultimate GPS Hat for Raspberry PI since May 2014 with no issues and good perf.
I have seen no PNP GPS capes for the BBB other than those configured for tracking apps so I have been using the mini modules with various Ublox chips. All wire and sticky tape.
Plenty of online "how-to" from 2013 and 2014, but we here on the list know that the "cheap GPS" receiver business is a very moving target - 4 years is a long time.
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"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw
On Mon, Oct 16, 2017, at 03:45 PM, jimlux wrote:
I have beagles, but others have pis.
There seem to be dozens of GPS receivers out there in a variety of form
factors.
What's the current "best" inexpensive choice for run of the mill
time-setting/1pps that's a "catalog" item
Plenty of online "how-to" from 2013 and 2014, but we here on the list
know that the "cheap GPS" receiver business is a very moving target - 4
years is a long time.
It's a bit old-school, but I have an Oncore UT+ attached to my Pi 2
Model B timing server at home. A simple MOSFET-based level shifter[1]
converts the serial and PPS signal from the 5V the Oncore outputs to the
3.3V the Pi requires and is sufficiently fast to not make a significant
difference in timing (I can't see any delay, even with my oscilloscope
turned down to 5ns per div). I also built a little interface board with
a supercapacitor-based backup for the Oncore's RAM that holds the level
shifter.
The Oncore driver for NTP is a bit chatty, so I have it save logs to a
small ramdisk[2][3][4] with the log being rotated every two days. Works
well.
I suppose using a 3.3V unit would be nice, but I had a bunch of Oncores
lying around that needed use, so why not? :)
Cheers!
-Pete
[1] https://www.adafruit.com/product/757
[2] The line in fstab is, omitting quotes, "tmpfs /tmp tmpfs
defaults,noatime,nosuid,size=100M 0 0"
[3] The entry in the ntp.conf file is "logfile /tmp/ntp.log", which was
done after making the change detailed at [4]
[4] http://lists.ntp.org/pipermail/hackers/2010-November/005004.html
--
Pete Stephenson
Jim,
I'm happy to give you my BBB and custom made gps cape for it if you want to
continue the work. I stopped all work right about the time I got married
(2 years ago) and likely will never circle back around to play with it
again.
It uses a Furuno GT-8736 timing receiver and I had it working with NTP
pretty easily. I'll try to dig it out and get into it and get it ticking
again before mailing it to you if you are interested in it.
Here are some plots I made before pulling the plug the last time:
http://nerdhouse.org/ntp/
-Bob
On Mon, Oct 16, 2017 at 7:45 AM, jimlux jimlux@earthlink.net wrote:
I have beagles, but others have pis.
There seem to be dozens of GPS receivers out there in a variety of form
factors.
What's the current "best" inexpensive choice for run of the mill
time-setting/1pps that's a "catalog" item
Plenty of online "how-to" from 2013 and 2014, but we here on the list know
that the "cheap GPS" receiver business is a very moving target - 4 years is
a long time.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
and follow the instructions there.