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

[ Thread Index | Date Index | More Archives ]

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 ______|_

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

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. :-)

Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind...'s backed up on a tape somewhere.

To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "unsubscribe" in the subject.
For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "help" in the subject.
Trouble?  Email listmaster@xxxxxxxxxxxxxxxxxxxx.

Mail converted by MHonArc 2.6.19+