DS1307, 7 segment and 8051 problem

[eng was]

Hello
I build a digital time and date clock using 8051, DS1307, 74595 and 7 segment, i write a code for multiplexing 7 segment and get the DS1307 code from net. the problem that i have that 7 segment blink. i measure the duration for get time and date from DS1307 is more than 130ms and the time for display the info on 7 segments is about 4 ms so i need help to minimize the time of fetching time and date.

Thanks in advanced

[AJISH ALFRED]

Hi,

I wonder why would you require to further reduce the time delay of reading and display! The DS1307 will update the values in its register every one seconds only ( 1 second = 1000 ms ), That means you have more than enough time to do the reading and display with 134ms delay before the DS1307 updates a value.  

[eng was]

Thanks AJISH ALFRED for reply

 

I use in main

DisplayTimeToSeg(Get_DS1307_RTC_Time());
DisplayDateOnSeg(Get_DS1307_RTC_Date());

 this take 130 ms

 i understand from your reply that i make loop display the date and time and get the Time and date from DS1307 every 1 sec once so my question is that this 130 ms when i fetch the new time and date the 7 segment did not effect by this time

 

Thanks again

[Ashutosh Bhatt]

you have to adjust all loop delays such that time displayed and refreshed on LCD after 1 sec. if fatching data from DS1307 takes 134 ms, you have to adjust other loop delays to generate delay of 866 ms  

[eng was]

Hi

I make a loop to do that, but in Proteus simulation i see simple blink in 7 segment every few seconds and see some number like 6 instead of 2, what can i do to get steady display

 

and if i use interrupts what can i do to make the 7 segment that what to adjust time in it blinking

 

i use 7 segment not LCD

 

Thanks

[eng was]

Dears

I have also problem in the LED that display PM time it blinking

[eng was]

Dear
7 segment work OK now but the led that indicate the PM not work ok i connect it to 74595 output as the 7 segment
I need help on blinking two 7 segment and other stable when i adjust time or date

Thanks

[eng was]

Dear
the new code is fetch date and time from DS1307 once every seconds for few ms then display it in 7 segment for the rest of seconds but i notice a very simple blink in 7 segment
Why the led that indicate the PM not work ok i connect it to 74595 output as the 7 segment

Kindly need help

[Author]

Posts