On Thu, 25 Sep 1997, myke predko wrote:

> Bernd Grunwald <embo@BSE.NETESTATE.DE> wrote:
>
> >Has anyone written some code reading the temperature from an DS1821 into an
> >PIC and can help me a little bit with implementing that? Or is there some
 code
> >somewhere on the Internet?
>
> I have some code for this on my web page for interfacing to a single DS1820:
>
> http://www.myke.com

I just found it and it seems to be exactly what I need.
Thanx!

> >I want to implement my project on the 16F84 4MHz. I have to wait in some
> >condition for about 3 minutes and also have to read the temperature (DS1821)
> >meanwhile. But I have only one timer in the PIC and that seems to be not so
> >simple. Has anyone an easy method to measure 3 minutes (+-10 sec) without
 using
> >the timer and working with the pic meanwhile. The IRQ pin PB0 would be
> >available, but I don't want to use much more external components ...
>
> Why don't you use the Watchdog timer?  If you have to use the Prescaler for

If I understood the Datasheet correct, the Watchdog timer resets the PIC, if it
is not in sleep mode?!?

> something else, you could use a 16 bit timer to count to 10,000 (which is
> the number of 18 msec intervals in 3 minutes).

Do You mean an external timer?

--
CU.
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