Re: [chrony-users] Time synchronisation over a high-latency packet radio network

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

Why not put in an  adafruit gps pps unit. They cost about $40, and get their
power from the computer. Don't know what your computer costs mind you.




William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Wed, 8 May 2019, Stuart Longland wrote:

> On 8/5/19 4:10 am, Chris Greenman wrote:
> > Is there any possibility of using GPS for time?  I had a similar dilemma
> > on my raspberry pi based boat computer.  I didn't want to rely on
> > internet provided time since it might not be available if away from the
> > slip.
>
> Well, two reasons we didn't go that route straight up:
> 1. cost (they cost nearly the price of the computer)
> 2. most are UART-based, and we don't have a UART free (UART0 is the
> console, and the PocketBeagle exposes UART2 and UART4).
>
> Putting in a RTC with a back-up battery is the other option, which would
> link over I²C, and we'd have to cook up a devicetree overlay to tell the
> kernel about it (not hard).  In hindsight, I should have put one in to
> begin with, but the boards are ordered now.
>
> We may go this route yet, but if I get this up and running, we'll have a
> way of setting that RTC when it's in the field rather than having to
> remember to do it at base. :-)
>
> Regards,
> --
> Stuart Longland (aka Redhatter, VK4MSL)
>
> I haven't lost my mind...
>  ...it's backed up on a tape somewhere.
>
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