Yes 16 bit ID Number will be good enough.
The values would not be greater than 50, but the device must have buttons
like a calculator so that the user must manualy enter an ID Number, and the
device must look up the ID Number and if it exist then it must ask for it's
value and the user must then enter the value.  Actualy it must be able to
stor 4 values for each ID Number.
I actualy want to help a dairy farmer who got the PC software with all his
animals and each animal have got an ID Number. Then he must be able to
updload all the ID Numbers and take the device with him where he enters the
ID Number and the device must look up the number and ask for it's value
(amount of milk).
But some of the farmers milk the cows 3 or 4 time a day.  When he is
finished he must be able to go back to the pc and upload the days milk.

Thx

----- Original Message -----
From: "Byron A Jeff" <byron@CC.GATECH.EDU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, August 04, 2002 10:29 PM
Subject: Re: Data logger


> On Mon, Aug 05, 2002 at 10:01:34AM +0200, Koos du Preez wrote:
> > I'm new in Picmicro and electronics and want to build a Data logger
about
> > the size of a standard calculator.
>
> So big?
>
> > It must be able to Store round about 300 ID Numbers and a value for each
ID
> > Number...
>
> What size ID numbers (I guess 16 bits should be enough)? What kind of
values?
> where are the values coming from? What is the frequency of sampling.
>
> > ...and I must be able to download and upload to the PC with RS232.
> >
> > Is this a dificult task,
>
> Not enough information to give an answer to that.
>
> >and where do I start?.
>
> Start with a 16F876. With it's compact packaging (28 pins), self
modifyable
> program memory, and built in USART, you should be able to handle the
memory
> storage and data transmission with little more than the part and a RS232
> level converter.
>
> As to the rest, you didn't provide enough information.
>
> BAJ
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
>

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads