[time-nuts] Lowest Power NTP Server

[Tim Shoppa]

ESP8266 as a simple UDP server is 50mA * 3.3V = 0.17W.

Tim N3QE

On Sun, Dec 1, 2019 at 12:22 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> If you are going to run the beast on batteries, and talk to it via WiFi,
> what’s the lowest power
> NTP server you can build? Timing source to keep it under a few ms would
> have to be included.
> GPS seems to be a reasonable choice.
>
> So far this seems to be the leading contender:
>
>
> https://www.researchgate.net/publication/332543537_BUILDING_A_RASPBERRY_PI_ZERO-W_GPS_NETWORK_TIME_SERVER_FOR_UNDER_50
> <
> https://www.researchgate.net/publication/332543537_BUILDING_A_RASPBERRY_PI_ZERO-W_GPS_NETWORK_TIME_SERVER_FOR_UNDER_50
> >
>
> Same paper at a different URL (thanks to TVB):
>
> https://www.satsignal.eu/raspberry-pi/Schmidt-RPZ-NTP-2016.pdf <
> https://www.satsignal.eu/raspberry-pi/Schmidt-RPZ-NTP-2016.pdf>
>
> Best guess is that it comes in around 0.5W. That is just a guess based on:
>
>
> https://raspberry-projects.com/pi/pi-hardware/raspberry-pi-zero/raspberry-pi-zero-hardware-general-specifications
> <
> https://raspberry-projects.com/pi/pi-hardware/raspberry-pi-zero/raspberry-pi-zero-hardware-general-specifications
> >
>
> and not (yet) a measured number.
>
> Application is for off grid / remote / out of cell coverage timing of
> various “stuff”. Power is from
> a battery so fractions of a watt do count.  More or less, 0.5W on a 5AH
> 12V battery runs for
> 120 hours. Something at 5W only runs for 12 hours …..
>
> Bob
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