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Author Topic: Police light time diagram  (Read 3768 times)
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snoopy
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« on: May 19, 2009, 10:03:35 22:03 »

I'm playing with 4 blue leds and I would like to light like on police cars.
Any of you know time diagram for blinking?

BR
Snoopy
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« Reply #1 on: May 22, 2009, 06:05:43 18:05 »

No light are blinking there. A mirror type metal makes the shadow 
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« Reply #2 on: May 22, 2009, 06:21:14 18:21 »

here is picture
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« Reply #3 on: May 23, 2009, 12:45:43 00:45 »

No light are blinking there. A mirror type metal makes the shadow 

I think snoopy is talking about new style LED police car emergency lights...It consists only 8 blocks of red and blue LEDs. 

Timing is something like,
750ms of red LED blocks are blinks at 10-15 Hz than same duration and frequency for blue...

I'll try the timing on a small circuit and post it in couple of days...

Regards...
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« Reply #4 on: May 23, 2009, 01:04:29 01:04 »

Flash rate is also dependent on speed of police car. you could get the police to chase you and workout flash rate v speed Smiley
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« Reply #5 on: May 23, 2009, 05:22:45 05:22 »

Analyze various movies that have scenes of police cars frame-by-frame to work out the timing.
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« Reply #6 on: May 23, 2009, 05:12:54 17:12 »

May be some useful info for you here:  http://www.instructables.com/id/DIY-LED-Police-Bike-Lights/

Unless you intend to use your lights in public, I'd suggest just making them look good.

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« Reply #7 on: May 26, 2009, 09:42:03 21:42 »

My friend have car model and he would like to have 4 leds that blink like police lights or formula 1 safety car lights.

On youtube is a lot of movie with this lights, here is one with two groups of leds.

http://www.youtube.com/watch?v=zIN-m8MocA4

Next days I 'll prepare hardware for leds, till then I am still asking if any of you have more info for time sequence.

Snoopy

here is one with good light :    http://www.youtube.com/watch?v=QZ5-dwrlJjI&feature=related
« Last Edit: May 26, 2009, 09:59:04 21:59 by snoopy » Logged
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