Subject: From: Date:

Re: [ECS] Monitor Battery Voltage? Bill Freeman/Austin/IBM Wed, 4 Oct 2000 09:10:41 -0500

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Joe:

I accomplished this with a simple voltage divider resistor network and used
an analog input on the SECU-16I.    I used two resistors, one of value  X
(K ohms) and the other 2X,   These were connected in series across the
battery and the analog input samples the middle junction.   Provided the
values are high enough so the wattage of the resistors is appropriate, the
specific resistor values aren't otherwise particularly important except
that the higher the total resistance the lower the "drain" on the battery
due to this circuit.

ECS reports analog inputs as a range from 0 to 256 where 256 corresponds to
5V at the analog input.   With a 3:1 voltage divider, the 12V battery is
sensed in a range of 0 to 4V  yielding analog input values from 0 to
approx. 200, or so.

Regards,

Bill Freeman
freemanb@us.ibm.com


"Joseph and Jessica Colson" <JColson@CajunNet.com> on 10/04/2000 05:48:51
AM

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Subject:  [ECS] Monitor Battery Voltage?



Hello Everyone -

     I have a Ocelot with a SECU-16I would like to know how I would
monitor a 12 volt battery?  Specifically I would like a circuit I could
build or maybe something I could buy that is already prebuilt.

Thanks Everyone,

Joe Colson

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