RTC module - Easypic5

[Bruce]

Dave,

Here's a link to the RTC2: http://www.mikroe.com/en/tools/rtc2-proto/

Malc-c,

You can use this with pretty much any pin that I2CWrite/I2CRead work on, and
you can probably find several PBP examples here for working with the DS1307.

[mackrackit]

Thanks Bruce,
I was going to suggest what you did but though maybe it was something special.
Just a regular RTC...

I use the 1337 on a 4550 with pins PORTD.0 and PORTD.1.
For whatever it is worth....

[Bruce]

Hey Dave,

Yeah - it's just a plain-old DS1307.....)

Malc-C,

Here's one of the best examples I've ever seen for PBP using the DS1307 by Melanie;
http://www.melabs.com/resources/samp...ted/MN1307.txt

I suspect the reason they recommend specific pins was due to them using hardware I2C
in the sample code they provide for the RTC module.

[rmteo]

I suspect the reason they recommend specific pins was due to them using hardware I2C in the sample code they provide for the RTC module.

That is correct.

[malc-c]

Thanks once again for all the input.

I'll take a look at those examples. I've not used any I2C device before so forgive me for these noobie questions - and Reading TFM just confused things

[ardhuru]

You can use this with pretty much any pin that I2CWrite/I2CRead work on, and
you can probably find several PBP examples here for working with the DS1307.

True, especially since you're using a complete module. If you were using a plain RTC chip, I'd suggest choosing 2 pins which are weak pull-up capable, the'd save you 2 external resistors on the signal lines.

Regards,

Anand

[malc-c]

Quick question, I'm having problems reading the schematic of the board http://www.mikroe.com/pdf/rtc2_schematic_v100.pdf

The board doesn't have the 3 x 2 header shown, just the 5 x 2 which connects to the easypic5. As I need to breadboard these modules to connect to the spare pins I'll have and not take up a full port can some one tell me what pins on the 5 x 2 header I need to connect to the PIC (other than supply )

EDIT: - just looked at the code and previous replies... RC3 and RC3 are suggested, so that would be pins 4 and 5 on the header

[rmteo]

One possibility to consider. If you do not need all the features of a full-blown RTCC (especially the calendar and alarm), you can implement a real time clock on a PIC18 with just a watch crystal and 2 capacitors - less than $0.30 in cost.



Using the Secondary Oscillator (RC0, RC1, and TIMER1), all it needs is just a few lines of code to implement an interrupt driven real time clock. Look at the data sheet section for TIMER1 for more details.