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PICList Thread
'Vehicle Automatic headlight controller'
2000\02\17@181655 by Terry

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While i'm at it, here's another freebie.

Normal dawn/dusk automotive headlight sensors simply detect light levels
for safe driving conditions and turn the headlights on or off automatically.

Where i'm at, we have 2 tunnels with "fail safe" lighting. This would cause
the dawn/dusk controller to mistake the artificial lighting as safe
lighting condition and turn the headlights off.

Murphy's law takes over and the fail safe lighting fails. Most drivers
don't bother to turn their headlights on even tho they're supposed to while
travelling through the tunnels. One heck of a pile up ensues.

Solution, make everybody turn their headlights on all the time or have a
light sensor connected to a PIC. As far as road/tunnel lightings are
concerned, everything is run off AC power. Even the dimming ballast is sort
of AC at 20kHz. So artificial lighting "blinks" anywhere from 50Hz to 40kHz
(to be on the safe side).

Additional functions programmed into the PIC would be:

Presettable time delay headlight shutter-offer.
Battery voltage monitor.
Auto headlight shutter-offer when battery's low (for old cars without
headlight warning or when you're parked and making 6 foot shadow animals to
entertain your kids)
Blown bulb indicator


Cheers
Terry

..... another one joins the Titanic

2000\02\17@192154 by Wagner Lipnharski

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Oh come on, it is quite simple.
Once the car's ignition is on, if the light sensor sees dark it turns
the car lights on immediately and stay on until you turn ignition off,
or if the sensor sees light for more than 10 minutes...  by the way, I
believe that the law says your car MUST stay with headlights on all the
time from dusk to dawn, doesn't matter what.

Terry wrote:
{Quote hidden}

2000\02\18@133351 by Terry

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Ahh.. so it turns your headlights on in a dimly lit carpark or garage and
remains on for 10 mins after you hit the summer noon day sun then keeps
your headlights off while you're travelling through an artificially
illuminated tunnel?

So what's the big deal if the tunnel is brightly lit? Ever been trapped in
a pitch black elevator? Or drive at 100km/h blindfolded?




At 07:20 PM 2/17/00 -0500, you wrote:
>Oh come on, it is quite simple.
>Once the car's ignition is on, if the light sensor sees dark it turns
>the car lights on immediately and stay on until you turn ignition off,
>or if the sensor sees light for more than 10 minutes...  by the way, I
>believe that the law says your car MUST stay with headlights on all the
>time from dusk to dawn, doesn't matter what.

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