I need to buy an RTC (Real Time Clock).
Which shows time in milliseconds.

 

hi,
Do mean
12:30:45.001
or
45045000 milli Sec

BTW: Did you try the depth SD logger program I posted.?
E

 

hi,
Do mean
12:30:45.001
or
45045000 milli Sec

BTW: Did you try the depth SD logger program I posted.?
E

I mean 12:30:45.001.
Absolutely, It is working well. As per requirements.

 

hi,
Can you say why you need that level of Resolution in your timing.
I guess you know that if you display time in millisecs, you cannot visually keep track of the changes.

and how Accurate do want this mSec clock.
E

 

We need to check changes as when and where happened.
And I did not understand what do you mean by Accurate.
Minimum it should be 12:30:45.01

 

hi ume,
Accuracy and Resolution is 'a well trodden path''

While a clock may show the Time in units of 1mSec, thats the Resolution

It could be showing the incorrect Time, Accuracy.

E
What are measuring to 1mSec.???

 

We are using a weather station whose values we are getting in milliseconds.

 

hi ume,
That sounds very unusual , do you have document for the Weather station to post.?

E

 

hi ume,
That sounds very unusual , do you have document for the Weather station to post.?

E

#241 ?

EDIT: https://www.airmar.com/uploads/brochures/WX_MARINE_APP.pdf would tend to indicate mS resolution would be pretty meaningless even if it is time stamping that way. It's just NMEA sentences...

 

hi Y,
Scanned thru that document.
If the NEMA data strings are stamped in mSec, I still do not understand why the TS needs a second RTC with 1mSec resolution..

@umerrai1

Please post a copy of the NEMA messages string that you are considering the need for requiring a 1mS RTC.

 

hi,
For reference by using a low cost GPS module and a ESP32 MCU, it is possible to create 1mSec resolution, RTC clock .

E

 

Will it consume less power than DS3231?

 

hi,
I use the DS3231, its is very accurate, but how do you plan to get the 1mSec resolution.

Post a copy of a NEMA string that you are receiving

E

 

Will it consume less power than DS3231?

If you are concerned about the 200μA used by the DS3231 we might need to discuss your battery arrangement…

 

Actually it is a datalogger for weather station. So I am a bit concern about power consumption. Because it will have an atmega328, airmar 200wx and sd card and a DS3231.

 

Actually it is a datalogger for weather station. So I am a bit concern about power consumption. Because it will have an atmega328, airmar 200wx and sd card and a DS3231.

The 200μA of the DS3231 is the least of your concerns. You need to worry about the other parts and make sure your battery is up to the job.

Could you explain the function of the RTC? I find it confusing...

 

Sir, I will explain you. Actually, it is a requirement from my boss. So we need time logged in at least 0.1sec. Tracking data with respect to time.

 

Sir, I will explain you. Actually, it is a requirement from my boss. So we need time logged in at least 0.1sec. Tracking data with respect to time.

Do the NMEA sentences not include timestamps? Does it have to be precise timing (that is, does it have to synchronize with other events recorded with high precision, high accuracy timestamps) or is it a matter of local correlation with events in the log only?

 

It is a matter of local correlation. Because in this circuit we don't have anything else connected.

 

It is a matter of local correlation. Because in this circuit we don't have anything else connected.

Then do the NMEA strings include timestamps? The weather station can provide 10 Hz GPS, maybe you could just run log.