F1 Style Rear Blinker

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.

__________________
Robert
-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -

cherubim

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.

Robert_Nash

Actually, my post was the bulb for the rear FOG light; not brake light.

I was looking online for that bulb as well and found several variants of a 7440; I didn't find an exact match nor did the end connectors look the same as the bulb that came with the rear fog assembly.

Of course for testing purposes, that's probably immaterial but if anyone is actually looking for an exact replacement it might signal some difficulty.

__________________
Robert
-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -