06-13-2009, 02:24 AM
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#10 (permalink)
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Base Member
Join Date: Jun 2009
Location: Lawndale, CA
Posts: 11
Drives: 04 pontiac
Rep Power: 17
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Quote:
Originally Posted by Robert_Nash
Which was why I was confused; the bulb for the rear fog light is, I'm fairly sure, different than whatever bulbs are used for the brake lights (in fact now that I think about it, the brake lights don't use "bulbs" at all since they are LEDs.
The bulb for the rear brake light is: 7440 W21W STANLEY 12V 4TQ 2DV
I have a feeling, however, that after doing a quick search, this may be a difficult bulb to get in the U.S. - not sure but could be an issue.
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Whatever the end design I use, it's best to test using the actual hardware the circuit will be driving. So, it's useful to have the bulb I'll be driving.
A 7440 bulb should not be difficult to procure in the US. A quick google search shows them available online for $3.
While a full blown PIC18 microcontroller could be overkill for this kind of project, an 8-pin PIC16 and a couple of transistors can make this a very small circuit leading to significantly easier installations. A flasher/relay circuit is also an option, and I can build one of those immediately.
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