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

David Lord snews at lordynet.org
Sun Sep 15 19:08:08 UTC 2013


David Taylor 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
> 

My Sure gps has both 5V ttl and 3.3V levels available by
soldering wires or fitting a pin header. I had tried both
the 5V ttl to parallel port and currently using your rs232
modification. I didn't note any significant difference in
parallel port vs serial port.


David



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