how to get precise time with pic - help needed

[arbj]

precise time with pic

use a watch crystal, they are stable and quite precise...for more precision a RTC can be used.

 

[pranam77]

precise time with pic

GPS sysnchronisation is another option. But a bit complicated.

 

[blueroomelectronics]

precise time with pic

Breadboards are no good for high frequency crystals.

 

[kender]

Re: precise time with pic

Breadboards are no good for high frequency crystals.

For 4MHz breadboard is OK - works for me all the time. Keep the connections short. Optionally, you can lift the pins of the microcontroller and solder the crystal directly onto them.

 

[doraemon]

Re: precise time with pic

Hello!

Actually it's the best option I know and it's not complicated at all.
You just need to plug the GPS and wait for the data bursts.
On some devices, you also have a 1 second output pin.

And you get a precision of about 1 ms... forever.
Well, that said, if you really want a 1ms precision, you have to count
the clocks of all the instructions you use and act accordingly, which is
a tricky task.

Dora.

GPS sysnchronisation is another option. But a bit complicated.