J
John Woodgate
Guest
I read in sci.electronics.design that James Meyer <jmeyer@nowhere.net>
wrote (in <86ldl092ka8b7eien9jeinlnbj5cirs0c6@4ax.com> about 'Battery
level tester.', on Sun, 26 Sep 2004:
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
wrote (in <86ldl092ka8b7eien9jeinlnbj5cirs0c6@4ax.com> about 'Battery
level tester.', on Sun, 26 Sep 2004:
What is trivial for you may well not be for an amateur astronomer. (;-)On Sun, 26 Sep 2004 11:53:19 +0100, John Woodgate
jmw@jmwa.demon.contraspam.yuk> wroth:
You CAN'T convert your voltmeter circuit directly into an integrating
ampere-hour meter, if that's what you mean by 'battery level meter' and
'battery level monitor'. You could pull it to pieces and use some of the
parts, but an integrating ampere-hour meter is not a trivial project for
you to build.
An integrating amp-hour meter **is too** trivial....
Yeah, right! (Hint: that ain't as easy to do as to say.)Measure the current draw with a current sensor. Convert the sensed
current to an appropriate voltage and use the voltage to drive a small, toy
sized, motor with a gear train on its output. Attach pointers to a couple of
the gears and you will have an amp/hour readout similar to the gas or electric
meter on the side of your house. Reset your meter to zero before use,
--always
start your observing sessions with a fully charged battery, and Bob's yer uncle!
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk