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Hey! Watch out!=0D
=0D
Analog input pins sholudn't be driven above VDD or below VSS at any
situations.=0D
=0D
Connecting the 10V line to any analog input will get the input, and maybe
the whole PIC, damaged.=0D
=0D
The voltage divider is, however a good idea.=0D
=0D
Lucas Hartmann=0D
=0D
-------Original Message-------=0D
 =0D
From: pic microcontroller discussion list=0D
Date: 01/05/04 15:38:43=0D
To: PICLIST@MITVMA.MIT.EDU=0D
Subject: [PIC]: Battery monitoring=0D
 =0D
Hi All=0D
 =0D
Perhaps you can help me out on this.  I want to produce a system for=0D
monitoring the voltage of my device's batteries which can then be used=0D
in charging and discharging.=0D
 =0D
I'm thinking about using the reference of my 5v voltage regulator is=0D
the base, and then looking at the battery voltage on top of that.  The=0D
batteries should never go above 10v so I shouldn't then need to do any=0D
sort of dividing and it should be quite accurate.=0D
 =0D
However I'm not sure whether this is a good idea or how to do it?  I=0D
must connect the 5V line up to one of the pins on the PIC but I'm not=0D
totally 100% confident which one, also I need to read in a A2D reading=0D
for the current and I think this will be impossible if I'm referencing=0D
from 5v as my shunt will need to be referenced from 0v....=0D
 =0D
Any ideas how I go about this?  Also is a good idea to stick some=0D
zeners on the pins of the PIC just in case the value ever somehow got=0D
over 5v?=0D
 =0D
Cheers=0D
 =0D
Ed=0D
 =0D
--=0D
http://www.piclist.com#nomail Going offline? Don't AutoReply us!=0D
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body=0D
 =0D
=2E

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