Digital Clock Using RTC

[AZZY]

Dear Brother and sisters

I want to display Real time ,Date ,month on a lcd using internal rtc of nrf52840 

its not working properly..

I have to reset the time again and again when power is off...............(why?)

[Sigurd Hellesvik]

Hi Azzy,

its not working properly..

Can you give some more details on this?

Regards,
Sigurd Hellesvik

[AZZY]

I have gone through the rtc example but I have not got anything related to it

[Sigurd Hellesvik]

Hi Azzy,

AZZY said:

there is no required example there in sdk5 regarding this

do you mean:

"There is no required examle there in sdk5 regarding the external rtc ds1307"

or

"There is no required examle there in sdk5 regarding where minute, hour and seconds can be easily read "

?

Regards,
Sigurd Hellesvik

[AZZY]

how to initialize rtc ?

How to read

HOUR,MIN,SEC,DAY,MONTH,YEAR,DATE CHARACTER FROM RTC

[AZZY]

YES SIR

There is no required examle there in sdk5 regarding where minute, hour and seconds can be easily read "

?

[Sigurd Hellesvik]

Hi Azzy,

In that case, see Edvin's answer in  RE: how to set target time for specific days

Regards,
Sigurd Hellesvik

[shiva74638]

Hi AZZY, 
I think you are confusing Real time COUNTER with Real time CLOCK. 
The nrf52840 has REAL TIME COUNTER. where as ds1307 is a real time clock module.
Any time keeping electronic device resets to zero when powered off.
If I remember correctly the ds1307 is also powered by a coin cell which keeps it ticking even though the main MCU is turned off. If you want implement the same you should run the device without powering off.
Hope it helps.

[AZZY]

yes you are right sir........

But i am unable to read HOUR SEC AND MINUTE in nrf........

[shiva74638]

nrf RTC libraries doesn't provide any hour, minutes info. As I said it is a real time counter it can only give the number of clock ticks passed by from the point it started. you have to calculate hour minutes sec. etc. from that clock ticks value in your code.

[AZZY]

ok sir Thanks

i will work on it...........