[ntp:questions] Trying to use Dimension 4 time keeper

unruh unruh at invalid.ca
Sun Sep 15 17:37:59 UTC 2013


On 2013-09-15, David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
> On 15/09/2013 08:09, unruh wrote:
>> On 2013-09-15, David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
> []
>>> Yes, the Sure unit, another low-cost option, does require a little
>>> modification to extract the PPS signal at RS-232 levels, although based
>>
>> That would completely burn out the RPi GPIO ports.
>
> Which is why my own recommendation has been to use the Adafruit GPS 
> module, which is 3.3V level compatible with the Raspberry Pi.  Here's 
> the URL - again!
>
>    http://www.adafruit.com/products/746

Yes, I saw it. Not sure what the voltages are on the Sure unit -- the
direct output of the PPS but I think 5V which is still a bit high. I
guess one could put a diode in series with the line to bring it down to
3.3V.


>



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