hi Randy

Regards,

Jim

> -------- Original Message --------
> Subject: RE: [PIC] Pull Up Resistors
> From: "Randy" <randyabernathy@bellsouth.net>
> Date: Wed, April 03, 2013 1:15 pm
> To: "'Microcontroller discussion list - Public.'" <piclist@mit.edu>
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> For the most part, 10K will work fine.  As you can see on your EasyPIC7
> development board (I have the same) 4K7 works just fine as well.  20K
> resistors are too large.  I have never used anything larger than a 10K in=
 my
> projects.  Of course there are always exceptions to any rule.
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> Randy Abernathy
> CNC and Industrial Machinery=20
> service, repair, installation and=20
> design
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> 4626 Old Stilesboro Rd NW
> Acworth, GA 30101
> Phone: 678-982-0235
> Fax: 770-974-5295
> E-mail: cnc002@bellsouth.net
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> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf =
Of
> Allen Mulvey
> Sent: Wednesday, April 03, 2013 1:47 PM
> To: PIC List
> Subject: [PIC] Pull Up Resistors
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> Sorry, this is my first post. I forgot to tag the subject
> line.
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> Is there a way to compute the optimum value of pull up (or
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> pull down) resistors on PIC digital inputs?
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> =20
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> Most example circuits I have seen seem to use 10k. My
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> EasyPIC7 board uses 4k7. I have been experimenting and 20k
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> resistors produce unreliable results. I don't see anything
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> in the data sheet to help with this.=20
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> I am using a pic16f877a. The leakage current is one
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> micro-amp. Sampling the port must draw considerably more. My
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> current project is not battery operated but, if it were, I
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> would like to use the largest resistors possible.
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> =20
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> Thanks,
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> Allen
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