Brake Light Modulator circuit diagram - Wrist Twisters
 
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post #1 of 9 Old 12-03-2008, 06:53 PM Thread Starter
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Brake Light Modulator circuit diagram

Hi everyone. Was just looking at brake light modulators and stumbled across a diagram and parts list to build your own, for the electronically minded. I'm going to hunt down the parts and build it through the week hopefully, and will let you all know how I go.

http://www.designnews.com/file/352-gadget102504.pdf

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post #2 of 9 Old 12-04-2008, 09:14 AM
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$275 to DIY? No thanks, I would rather buy a commercially made unit. I believe the D.O.T. here has limits for flash rates on brake lights. I know for a fact that they do on headlight modulators.

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post #3 of 9 Old 12-04-2008, 09:46 AM
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It looks like a fun project to try and figure out, but $275 for the sensor plus the required cost of machining an adaptor seems insanely expensive when a plug & play item can be purchased for $70 http://www.vizi-tec.com/HONDA/PRODUCT_HONDA.htm
or a unit that requires you to splice the wires can be had for $35 http://www.cyclegadgets.com/Products...ct.asp?item=BO

If you're doing it for the love of tinkering or figuring things out, by all means have fun and let us know how it goes, but there are much cheaper options out there.

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post #4 of 9 Old 12-04-2008, 10:58 AM
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The pressure sensor activated one would not be suitable for a motorcycle unless you put a sensor on the front and rear brakes, nearly doubling the cost.

On the other hand, the circuit activated by the brake light switch only would cost about $10 for all the components including perf board, but no enclosure. Building the circuit and encapsulating it in electronic grade RTV silicone would be the best way to package it, and for $10 it's by far the least expensive way to modulate the brake light.

Good find.

Rob

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On the other hand, if it has not been done never assume it is impossible to do it.
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post #5 of 9 Old 12-04-2008, 11:51 PM
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The 2nd option seems like the most interesting one... the harder you're braking, the quicker the flashing I assume. This would seem to be the most attention-getting option anyways. Finals are coming up and then Christmas break... my soldering iron has been cold for a couple weeks now; might have to see how steady my hands are!

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post #6 of 9 Old 12-05-2008, 07:42 AM
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Thank you for the great post! He went wild with the overkill hydraulic sensors, but the basic design for $10 you can't beat! I still like my www.kisantech.com variable rate best as they start a fast flash rate and then slows. But for a fraction of the price with this circuit you'd get similar protection from tailgaters. I am inspired to rework my cages' brakelights! It needs a heatsink on the drive FET with multiple brake light load.

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post #7 of 9 Old 12-05-2008, 07:45 AM
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JAMECO electronics is where I order all my stuff for building electronic gadgets. Prices are good and they have about everything. If you call they are very helpful. I wish I was getting kick backs for recommending them.

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post #8 of 9 Old 12-05-2008, 02:36 PM Thread Starter
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Yeah, I didnt think the option 2 or 3 in the diagram would be viable, due to price. Also I dont believe the modulators that can be bought have the accelerometers etc.....

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post #9 of 9 Old 12-08-2008, 08:26 PM
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Quote:
Originally Posted by rockdog32 View Post
Yeah, I didnt think the option 2 or 3 in the diagram would be viable, due to price. Also I dont believe the modulators that can be bought have the accelerometers etc.....
3-axis accelerometer: http://www.mouser.com/Search/Product...96UDkIDg%3d%3d

$6.72 - not too bad, if you can solder it!

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