[ntp:questions] ntp & system without a rtc

folkert folkert at vanheusden.com
Fri May 10 16:56:27 UTC 2013


> > I have a raspberry pi system. This is a computer without a real time
> > clock. So everytime I power it on, it uses starts where it left off
> > which might be days earlier. It is connected only very occasionally to
> > the internet so syncing to that won't work. It does have, however, a gps
> > connected. But as it is switched mostly for less than an hour, ntpd
> > won't have the time to adjust the time to what the gps returns to it.
> 
> Why not use somthing like this: 
> http://www.adafruit.com/products/255
> ChronoDot - Ultra-precise Real Time Clock - v2.1 
> The ChronoDot RTC is an extremely accurate real time clock module, based
> on the DS3231 temperature compensated RTC (TCXO). It includes a CR2016
> battery (not shown, but included in the product) which should last at
> least 8 years if the I2C interface is only used while the device has 5V
> power available. No external crystal or tuning capacitors are required.

That's an option but I'm currently aiming for a solution that doesn't
cost any extra money.


Folkert van Heusden

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