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DavidM
Joined: 07 Jul 2004
Posts: 41
Location: Victoria, Australia, Earth, Milky Way Galaxy
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Dick Smith has several kits that may be applicable.
The first kit (K3118) uses a Dual color LED, with the above mentioned comparator, it uses a trim pot to set the transistion point for Green to Red.
If you are using SLA (K4205) has three LEDs Red/Yellow/Green and uses zeners/transistors to switch between LEDs, designed for lead acid battery thresholds.
I use the Jaycar expanded scale bargraph kit (KA1683), which has 10 LEDs showing battery status over a short range.
Of course the cheapest is to get 5 LEDs and 6 resistors (for 12V more if higher) to form a passive bargraph, of course the transistions are softer than the bargraph kit.
There are enough voltmeters indicators on the market, but a 'fuel gauge' system that would be cool, something that measures the current In or Out of the battery and integrates this to give an indication of charge remaining in the battery, I remember Philips had a chip that they used for their shavers which did this, maybe its something worthy of development. _________________ "Limitation shows the Master."
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Wed Sep 01, 2004 2:20 pm |
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