Real Time calendar - Electronic Circuits Projects Diagrams Free

engkhlaif · 12th May 2008, 08:08 PM

i need a help in a real time calendar using PIC16F877A
iam using c language and then i need to display the time and date on lcd 16*1 like:
10:15:59
21 jan 2008
i just need the function that calculate the time and the date and thanx for every one who can help me

Gordz · 12th May 2008, 08:47 PM

most of it can be done with simple counters and a real time interupt. In the interupt service routine ripple through each counter. Say the interupt happenes every second, increment the seconds counter each time and see if it has reached sixty. When it does reach sixty, clear it and increase the minutes counter by one and so on until you are counting hours, days, months and years.

engkhlaif · 12th May 2008, 11:43 PM

Quote:

Originally Posted by Gordz

most of it can be done with simple counters and a real time interupt. In the interupt service routine ripple through each counter. Say the interupt happenes every second, increment the seconds counter each time and see if it has reached sixty. When it does reach sixty, clear it and increase the minutes counter by one and so on until you are counting hours, days, months and years.

thanx
but do u have a sample code
iam not to use the interrupts as our instructor said

Pommie · 13th May 2008, 12:33 AM

If you download the 16F88 data sheet you will find the code you require on page 77 in example 7-3. Aren't Microchip a nice company.

BTW, don't use the interrupt, just poll the timer1 bit.

Mike.

bryan · 13th May 2008, 06:20 AM

If you can tackle assembler Microchip has the code for a 16f. Just search Maestro.

http://ww1.microchip.com/downloads/e...int.readme.pdf

It is one of the supplied modules, does leap years and is good to the year 12700<g>

engkhlaif · 13th May 2008, 11:11 AM

Quote:

Originally Posted by Pommie

If you download the 16F88 data sheet you will find the code you require on page 77 in example 7-3. Aren't Microchip a nice company.

BTW, don't use the interrupt, just poll the timer1 bit.

Mike.

thanx man i will do that
and do u think that will run on PIC16F877A
thanx again i will try the code

**Nigel Goodwin** · 13th May 2008, 11:41 AM

Quote:

Originally Posted by engkhlaif

thanx man i will do that
and do u think that will run on PIC16F877A
thanx again i will try the code

They both have the same 14 bit core, so there should be no problems.

Gordz · 13th May 2008, 11:58 AM

iam not to use the interrupts as our instructor said[/quote]

OK, you did not specify that in your requirement. Like Mike said, poll TMR1.

engkhlaif · 13th May 2008, 02:27 PM

Quote:

Originally Posted by Pommie

If you download the 16F88 data sheet you will find the code you require on page 77 in example 7-3. Aren't Microchip a nice company.

BTW, don't use the interrupt, just poll the timer1 bit.

Mike.

thanx for ur hint
but i dont know the assembler iam just using PICC C compiler in MBLAP v7.31
and iam using c language not assembly
so any one just has the code that find the time and date and iam very glad to him

blueroomelectronics · 13th May 2008, 02:30 PM

Post the code you've done so far.

12th May 2008, 08:08 PM	(permalink)
engkhlaif Experienced Member	Real Time calendar i need a help in a real time calendar using PIC16F877A iam using c language and then i need to display the time and date on lcd 16*1 like: 10:15:59 21 jan 2008 i just need the function that calculate the time and the date and thanx for every one who can help me

13th May 2008, 02:30 PM	(permalink)
blueroomelectronics Experienced Member Blog Entries: 4	Post the code you've done so far. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
Using Oscilloscopes	mechie	Electronic Theory	9	29th November 2007 09:48 PM
Help me to calculate the interrupt time	Suraj143	Micro Controllers	20	11th October 2007 04:54 AM
PIC18F2550 with real time counter (DS1302)	ash87	Micro Controllers	8	30th July 2007 03:21 AM
Real Time Clock RTC 8583	sonic	Micro Controllers	0	16th May 2004 07:32 PM
Real Time voltmeter	CarElectronics	Electronic Projects Design/Ideas/Reviews	1	4th September 2002 02:16 PM

12th May 2008, 08:47 PM	(permalink)
Gordz Experienced Member	most of it can be done with simple counters and a real time interupt. In the interupt service routine ripple through each counter. Say the interupt happenes every second, increment the seconds counter each time and see if it has reached sixty. When it does reach sixty, clear it and increase the minutes counter by one and so on until you are counting hours, days, months and years.

13th May 2008, 12:33 AM	(permalink)
Pommie Experienced Member	If you download the 16F88 data sheet you will find the code you require on page 77 in example 7-3. Aren't Microchip a nice company. BTW, don't use the interrupt, just poll the timer1 bit. Mike.

13th May 2008, 06:20 AM	(permalink)
bryan Experienced Member	If you can tackle assembler Microchip has the code for a 16f. Just search Maestro. http://ww1.microchip.com/downloads/e...int.readme.pdf It is one of the supplied modules, does leap years and is good to the year 12700<g>

13th May 2008, 11:58 AM	(permalink)
Gordz Experienced Member	iam not to use the interrupts as our instructor said[/quote] OK, you did not specify that in your requirement. Like Mike said, poll TMR1.