Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On 10/24/17 11:27 PM, Michael Wouters wrote: Hello Jim We are using BeagleBone Black + GPS 1 pps etc in our time-transfer system You can see the overlays in https://github.com/openttp/openttp/tree/develop/software/system/device-tree-overlays Best regards Michael Tnx, I think my signal is co

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Hi! You could also look at NavSpark (http://navspark.mybigcommerce.com/navspark-arduino-compatible-development-board-with-gps/). It has a serial NMEA output, a PPS digital output AND a trigger pin for timestamp capture. Regards, Edésio On Wed, Oct 25, 2017 at 07:45:49AM +0100, Iain Young wrote

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Hi Michael, You Wrote: We are using BeagleBone Black + GPS 1 pps etc in our time-transfer system You can see the overlays in https://github.com/openttp/openttp/tree/develop/software/system/device-tree-overlays Very interesting, I will have to clone the git repo, and have a closer look. I ha

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Hello Jim We are using BeagleBone Black + GPS 1 pps etc in our time-transfer system You can see the overlays in https://github.com/openttp/openttp/tree/develop/software/system/device-tree-overlays Best regards Michael On Wed, Oct 25, 2017 at 11:43 AM, jimlux wrote: > On 10/24/17 5:04 PM, Nick

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On 10/24/17 5:04 PM, Nick Sayer via time-nuts wrote: FWIW, I’ve documented the whole R-Pi GPS NTP thing at https://hackaday.io/project/15137 As a disclaimer I will also say that I’m not even remotely the first. But what’s kind of nice is that I have a R-Pi desk clock display board that plays

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

hmur...@megapathdsl.net > Subject : Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time > capture? > >>>> For under a $100 you could get a Raspberry Pi, a GPS HAT, and >>>> connect your input to a GPIO pin. Configure ntpd to log the real >>>> PPS

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Original message >From : hmur...@megapathdsl.net Date : 21/10/2017 - 7:49 am (GMTDT) To : g...@rellim.com Cc : time-nuts@febo.com, hmur...@megapathdsl.net Subject : Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture? >>> For under a $100 you could get

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

>>> For under a $100 you could get a Raspberry Pi, a GPS HAT, and >>> connect your input to a GPIO pin. Configure ntpd to log the real >>> PPS and the input as another 'PPS'. >> Is there an option to log all individual PPS events? ># ppswatch /dev/pps0 That's a way to log stuff, but I don't

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On the home brew side there are GPS receivers (Ublox Lea 6T and Lea M8T) that will time tag incoming signals to sub usec resolution . You of course need a PC/micro to configure and read the data. Also, if you are prepared to have a Beaglebone Black in your box you can use one or both of the two

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

jim...@earthlink.net said: > I imagine that there's a way to "constantly" press the button with a > jumper, too. It's easier than that. Just turn off the bootable flag on the eMMC. Then it automagically tries the SD card. -- These are my opinions. I hate spam.

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Hi One of the big shocks shopping for some of this stuff is that the single piece price may be 5X the “volume price”. That’s not true of everybody, but it’s true of a lot of vendors. This sort of thing does not apply only to GPSDO’s. On top of that, we get used to buying some items for “salv

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Hello, Might be my first post. Thanks for the group wisdom. I did not see any pricing on the web page for http://www.spectruminstruments.net/TM4.pdf , and the site seems to be (c) 2007 (a decade ago). Before I contact that vendor, I’m curious about

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On 10/18/17 4:17 PM, Hal Murray wrote: jim...@earthlink.net said: This is one of the reasons I use beaglebone greens - soldered in eMMC so no need for SD card ... The advantage of the SD card is that you can easily start over when your "disk" gets trashed. "Easy" of course is dependent on y

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

jim...@earthlink.net said: > This is one of the reasons I use beaglebone greens - soldered in eMMC so no > need for SD card ... The advantage of the SD card is that you can easily start over when your "disk" gets trashed. "Easy" of course is dependent on your opinion and talents. I think you

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On 10/18/17 2:09 PM, Adrian Godwin wrote: On Wed, Oct 18, 2017 at 9:11 PM, Gary E. Miller wrote: Yo Hal! On Wed, 18 Oct 2017 12:26:27 -0700 Hal Murray wrote: For getting started, you also need: SD card reader/writer keyboard and mouse (Pi has USB) display adapter (Pi is HDMI) d

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

> picPET -- Precision Event Timer http://www.leapsecond.com/pic/picpet.htm Thanks for the plug. Yes -- it does sub-microsecond relative time-stamping simply: one Schmitt-trigger TTL input pin and one RS232 output pin. But -- it's a $1 chip, not a black box. And the timestamps aren't UTC either.

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On Wed, Oct 18, 2017 at 9:11 PM, Gary E. Miller wrote: > Yo Hal! > > On Wed, 18 Oct 2017 12:26:27 -0700 > Hal Murray wrote: > > > For getting started, you also need: > > SD card reader/writer > > keyboard and mouse (Pi has USB) > > display adapter (Pi is HDMI) > > display > > Yeah, just

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

> Ethernet, add $25. > > Perhaps less : http://www.ebay.co.uk/itm/122596979464 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

A black box was asked for. Who cares what the OS inside is if you never need to mess with it. A surprising number of things run linux variants. Pretty much every smart phone is linux or unix... What is the output format you would like for your timestamp? disk, network file system, serial all can b

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Yo Hal! On Wed, 18 Oct 2017 12:26:27 -0700 Hal Murray wrote: > > For under a $100 you could get a Raspberry Pi, a GPS HAT, and > > connect your input to a GPIO pin. Configure ntpd to log the real > > PPS and the input as another 'PPS'. > > Is there an option to log all individual PPS events

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

picPET -- Precision Event Timer http://www.leapsecond.com/pic/picpet.htm On Wed, Oct 18, 2017 at 1:33 PM, Rob Seaman wrote: > Attila Kinali wrote: > > On Wed, 18 Oct 2017 08:47:58 -0600 > > Rob Seaman https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts>> wrote: > > > > > I’m at the annual

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

> For under a $100 you could get a Raspberry Pi, a GPS HAT, and connect your > input to a GPIO pin. Configure ntpd to log the real PPS and the input as > another 'PPS'. Is there an option to log all individual PPS events? The $100 for a Pi might be significantly low. It depends on what you h

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

The "no Linux" complicates things. Ignoring that... Assuming you have a PC with good time, you can use the PPS capture technology to get a time stamp from any signal. I use it to monitor power line frequency with a simple python script. If you want GPS on that PC, that will use the first ser

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Yo Rob! On Wed, 18 Oct 2017 11:33:28 -0600 Rob Seaman wrote: > That’s why they want a black box. Volume is one to several, but could > imagine a bulk order if savings were significant. Hundreds of dollars > might be the price point. For under a $100 you could get a Raspberry Pi, a GPS HAT, and

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

So, if I hear you right, you want a ttl input to trigger a timestamp, accurate to ms or µs to a file, correct? Bob On Wed, Oct 18, 2017 at 1:33 PM, Rob Seaman wrote: > Attila Kinali wrote: > > On Wed, 18 Oct 2017 08:47:58 -0600 > > Rob Seaman https://www.febo.com/cgi-bin/ > mailman/listinfo/ti

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Attila Kinali wrote: > On Wed, 18 Oct 2017 08:47:58 -0600 > Rob Seaman > wrote: > > > I’m at the annual planetary sciences meeting (in Provo this year) and > > several > > groups have expressed interest in duplicating our setup (details o

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On Wed, 18 Oct 2017 08:47:58 -0600 Rob Seaman wrote: > I’m at the annual planetary sciences meeting (in Provo this year) and several > groups have expressed interest in duplicating our setup (details of FO > converters, Schmitt triggers, etc, omitted) in a “cheap black box” to quote > one fello

[time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Howdy, I’ve been working for the Catalina Sky Survey for a couple of years. For many years, CSS has been one of the most productive discoverers of Near Earth Objects (NEOs), that is, of asteroids and comets that are potentially hazardous to the Earth. As you might imagine there are numerous in