hi. well i have to implement an intelligent lighting system. after detecting the person from PIR sensors, light has to be switched on for some time only at night time. Im using a 12 V battery as a power source which is powered by solar pannel. im having the problem in keeping the battery output constantly at 12 V, because after sometime the voltage is bound to drop, and the circuitry will not work properly in fluctuating voltage.
You need more batteries!
Also, Google for 'sepic'.
Regards, Bob Monsen
if you used lower voltage circuitry, you can thus use a regulator to operate the control electronics. 5 volt operation is common.
to keep your unit not working during light hours, employ a photo cell that inhibits the circuit. Just mount it behind a lamp so it won't see it self and oscillate.
If you take a part one of those cheap out side automatic flood light systems, you'll find most likely the internal electronics operates on low voltage. You have every thing you need there.
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