Abstract
This chapter focuses on the lights-are-on reminder, which automatically sounds an alarm if the car's lights are left on after the ignition is turned off, that is, after the car is parked. Two basic versions of the unit are described in the chapter. The first version uses a bell or buzzer as the alarm generator. The second version uses an electronic alarm generator. The chapter shows in a diagrammatic form the negative ground version of the basic lights-are-on reminder, using a 12V buzzer or bell as the alarm generator. Operation is very simple. When the car lights are left on using the electronic version of the unit, a loud and fairly high frequency “reminder” tone is generated as soon as the ignition is turned off; if the lights are left on, for night parking, the volume and frequency of the alarm then decays down to zero over a period of about 15 seconds. Thus, the alarm turns itself off automatically after a limited time and consequently, eliminates the need for the manually operated switch (S1).
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