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Never forget to turn off your headlight ever again!
Most new cars already have a headlight alarm built in but there are still many cars out there without that feature. This circuit is cheap and easy to put together.
For a few other car-related gadget ideas, why not have a quick look at Cruising: Gadget Freaks for your car.
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Comments (2)
The headlamp warning cicruit is not interlocked to the courtesy light circuit. This means that it is impossible to leave the car with the lights on without the alarm sounding as might ocurr if one is waiting in the car with the lights on and engine off.
If the intention is to feed the alarm from the headlamp feed then a flat battery is still possible if the side lights are left on.
The functionality as shown could have been achieved by simply wiring the piezo buzzer in series with a diode between the lighting feed and ignition line.
Posted by Jeremy Stevens | October 10, 2007 1:21 PM
Posted on October 10, 2007 13:21
What a ridiculously over-engineered solution. A buzzer in series with a diode between the lighting feed and the courtesy light switch works well for me. Buzzer sounds when you open the door which is when you need the reminder.
Posted by David C Brown | January 22, 2008 5:25 PM
Posted on January 22, 2008 17:25