LIGHTS_ON_REMINDER

Published:2009/7/6 2:19:00 Author:May | From:SeekIC

With both the ignition and the car lights on, piezo transducer BZ1 draws no current and remains silent. With only the ignition on, diode D1 is reverse-biased and so prevents current ftow through BZ1. However, when the lights are on and the ignition is off, the transducer becomes energized and sounds to alert you to turn the lights off. With the ignition off and the lights on, D2 is reverse-biased, preventing current from flowing to the ignition.Resistor R1 prevents a short circuit when the ignitionison is on.



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