| Title: | Electro_Hobby |
| Notice: | TEKVAX may be up-and-down 'till we get settled in.. |
| Moderator: | TEKVAX::KOPEC |
| Created: | Thu Jan 15 1987 |
| Last Modified: | Tue May 20 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1831 |
| Total number of notes: | 14297 |
I'm currently building a battery compartment for my boat which will
hold three deep cycle marine batteries. What I would like to do is
mount 3 LED bar graphs, one for each battery, which indicates the
battery condition. Only one battery will be on the charging system at
a time, and a master switch will be used to switch between batteries.
The bar graphs will be a good indicator of when to switch the battery
under charge. They will also be useful for monitoring battery condition
when I'm running 12v gear on the boat while it's moored.
Does anyone have a simple circuit that will do this?
Thanks for any help you can offer.
Regards,
Denis
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1830.1 | LM3914..? | TEKVAX::KOPEC | Consider a spherical chicken; .. | Wed Mar 12 1997 12:36 | 8 |
Probably easiest to base it on an LM3914 bar/dot driver.. the NS 1982
linear databook has an expanded-scale circuit that is probably just the
thing to use.. (well, that one is centered around 5v, so you'd have to
change some values..)
Digi-key lists the LM3914 for $3.75/ea in small quantities.
...tom
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