-----Original Message-----
Date: Segunda-feira, 30 de Mar¨o de 1998 16:11


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<"ISOPRO-1.61.063::DH-NO::2CFF::351FF8EA*/G=Steve/S=Kosmerchock/OU=Phoenix/O
=Ce
>             lwave/PRMD=ACAB/ADMD=Telemail/C=US/"@MHS>
>Date:         Mon, 30 Mar 1998 11:45:43 -0800
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>Sender: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>From: Steven Kosmerchock <Steve.Kosmerchock@CELWAVE.COM>
>Subject:      Need help with a 30 min. timer.
>To: PICLIST@MITVMA.MIT.EDU
>
> Hello everybody,
>I'm new to the world of PIC's.I was wondering if anybody have any
suggestions to
> help me out. Here's my problem: I need a timer that once activated will
run 30
> minutes, after the 30 minutes is up a relay will be triggered. Any code,
> schematics, or advice would be greatly appreciated. I have the ability to
use
> and program these PIC's: 12C509, 12C672, 16F84, 16C63, 14000. Any and all
> comments welcomed. Thanks in advance!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
>                        Steven Kosmerchock
>
>EMAIL:  steve.kosmerchock@CELWAVE.com
>


    Do you REALLY need a microcontroller for this????? Why not using a 555
astable and a BIG divider... The error would be much less then 5 % when
correctly adjusted! Or even better use the 555 as a monostable with large
timing! It doesn't even have to be programmed!