Pulsing LED Third Brake Light (12F675)

pasanlaksiri

Member

• Feb 13, 2010

• #1

How its works ?

Its pretty simple. As soon as you hit the brakes Third Brake light will flash at 20Hz.
And after 3 seconds Third Brake light will be Steady on.

Why Pulsing Third Brake Light ?

Because This will help get the attention of the drivers following behind you.
Even when your in bumper to bumper traffic.

Caution:

DO NOT CONNECT THIS CIRCUIT TO YOUR MAIN BRAKE LIGHTS. Any type of flashing light on the main brake lights is prohibited and illegal. Use this circuit at your own risk and be aware that the possibility exists to be stopped by law enforcement if you implement this circuit in your vehicle.

Pulse Train Graph for better understanding

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Schematics in jpeg format

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See attachments for Schematics and HEX File for PIC12F675

 

Attachments

• Pulsing LED Third Brake Light.zip

  371.7 KB · Views: 837

R

RealAlex

New Member

• Mar 17, 2010

• #2

Hello, your project is very nice.
I would like to ask you to how modify time fom 3 s to 1.5 s and frec. from 20 hz to 10 Hz, it's possible ?

Thnx,
Alex.

 

pasanlaksiri

Member

• Mar 17, 2010

• #3

RealAlex said:

Hello, your project is very nice.
I would like to ask you to how modify time fom 3 s to 1.5 s and frec. from 20 hz to 10 Hz, it's possible ?

Thnx,
Alex.

Click to expand...

yes. I'll post the code. So you also can edit it. as u want.

 

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RealAlex

New Member

• Mar 17, 2010

• #4

Please
Thnx.

 

pasanlaksiri

Member

• Mar 17, 2010

• #5

Here is the code. Its already adjusted for your requirement.

 

Attachments

• 12f675..zip

  7.6 KB · Views: 387

audioguru

Well-Known Member

Most Helpful Member

• Mar 17, 2010

• #6

You forgot to say that the LEDs are 2V red ones. It is illegal and they won't work anyway if they are 3.5V white or blue ones.

 

pasanlaksiri

Member

• Mar 17, 2010

• #7

Ahhhh yes. Thank you Guru for mention it. Very sorry for that.

 

Last edited: Mar 17, 2010

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RealAlex

New Member

• Mar 19, 2010

• #8

I found on internet:

" Once you have applied your brakes for the first time causing your third brake light to flash and then turn solid, touching your brakes again within 8 seconds will cause your third brake light to turn on normally without flashing. In other words, you must have your foot off the brakes for more than 8 seconds before the Blinking Stop will reset and cause your third brake light to flash again. "

It's hard to modify my pic to do this?
My experience with controller it's 0 ====> But i have ChipMax 2 Programator

 

audioguru

Well-Known Member

Most Helpful Member

• Mar 19, 2010

• #9

I think a flashing 3rd brake-light will confuse the old woman driving behind you so she will think she is dreaming and take her foot off her brakes. CRASH!