4.7K to +5 is very reasonable (I typically use 5.1K). With your scheme of
adding additional slaves, I think your best choice is to include the pullups
only at the master.

David
 

> -----Original Message-----
> From: alan smith [mailto:micro_eng2@yahoo.com] 
> Sent: Wednesday, January 17, 2007 2:01 PM
> To: Microcontroller discussion list - Public.
> Subject: RE: [PIC] I2C dropping data in PIC slave
> 
> Thanks for all the tips.  I am going to hook up a very short 
> cable to another board and see if that makes a difference, 
> while building up a shielded cable for the real design.  As 
> far as pull-ups, since the master has pullups, think they are 
> 4.7K to +5, maybe there isnt a need for them to be on the 
> slave side then, for some reason I always thought they needed 
> to be associated with each slave.
>  
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