Subject:
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RE: Low battery detection
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 17 Mar 1998 18:46:50 GMT
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Original-From:
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Jaron Paludanus <j.paludanus@tip.nlNOSPAM>
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Viewed:
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1473 times
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Can you translate this into "EE for dummies?".
I slowly start to grasp some of the idea about
voltage dividers but still don't understand.
Won't this setup drain the battery? How does
one calculate and wire such a thing - in this
particular case?
I ask this because I want to use a lead battery
for my lego robot, not only do I have such a
battery already :) but I understood that the
characteristics of these things tend to be a
more gentle curve towards the LOW battery
situation and thus better measurable.
(Opposed to NICADs steep curve from 1.2 to
0 point something very quickly)
Help would be appreciated!
jaron paludanus
j.paludanus@tip.nl
-----Original Message-----
From: Brian Lavery [SMTP:blavery@acslink.aone.net.au]
Sent: Wednesday, October 29, 1997 3:14 AM
To: handyboard@media.mit.edu
Subject: Re: Low battery detection
> Is it possible for a handy-board program (either 'C' or assembler) to
> detect a low battery condition?
Sure:
Solder a wire to the "BATTERY +", add 2 resistors to make a voltage divider
(to divide the battery ABSOLUTE MAX condition, say about 12V, down to about
4 volts for the analog 0-5v range), and feed it into an ANALOG input point.
Put a multimeter on the battery to measure its volts in a LOW charge
condition, and then in a HIGH charge condition. Read the HB analog input
value for both those conditions, and assume a linear connection between bat
volts and analog reading.
Pity it wasn't built in!
Brian Lavery
blavery@computer.org
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