Fake car-alarm flashing LED - using 555 timer

346

06:31:26

Build your own fake car-alarm flashing led.

The circuit is powered by 9V battery and is interupted by a Switched live wire (14.2V). 

The two LEDs on the right actually represent a red-green-bicolor LED.

If the switch on top is open, the LED blinks red, indicating the "alarm" is on. Closing the switch - turning the ignition key - makes the LED switch to green...

published 8 years ago

DavidRass

8 years ago

Nice

Robert_Kidd

8 years ago

So all I have to do now is buy a fake car LOL. Useful circuit.

BillyT

8 years ago

Nice idea and circuit, to save using up 9 V batteries all the time, I would tend to run a circuit like this off the vehicle's main battery or put a rechargeable battery pack in.

Smartopix

8 years ago

@Billy T You could indeed change the circuit to run it off the main battery. It would require some finetuning of the resistors/capacitor. I'd go for the rechargeable battery pack...

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