Thread: Light sensor

place one sensor looking outside through the window and the other in the dash. Then have the sensor compare the light input from outside to light input from inside. Then write a program to adjust the light output on the screen to adjust accordingly.

Originally Posted by Tred

place one sensor looking outside through the window and the other in the dash. Then have the sensor compare the light input from outside to light input from inside. Then write a program to adjust the light output on the screen to adjust accordingly.

how to tell the sensor looking outside it daylight og light from another car. ????

I would like to see that. Don't know how it would work or anything. Could you just have it located like near the lower section of the dash? Ambient light would be fairly consistant, and you would not get headlights or anything in that location. I am thinking like under and a little in front of the glovebox looking toward the passenger side floor mat.

It would be nice to then somehow set the skin for your front end and change the settings for the screen.

I was thinking about doing this at some point. but the way that I understand in cars that come with light sensors to control headlights there is a delay on it. This is to prevent street lights, other cars headlights, etc from triggering it. So basically you would monitor the sensor for a couple minutes and after that if there is no change then do whatever you need to do.

btw, most manufacturers place this sensor on the dash near or in the defrost vent.

Originally Posted by 4u2n

how to tell the sensor looking outside it daylight og light from another car. ????

Actually it is not so hard, despite what it seems to us as basically the same brightness (car lights or day lights) in fact they vary in brightness by order of magnitudes, our eye doesn't see that because it has logarithmic scale.
So with a circuit, correctly calibrated, it should not have any trouble distinguishing the two instances.

Personally, I'd like to have the gamma adjust and the player change to a night skin when I tell it to by flipping a switch or press a soft button. I'm sure this is possible but I have no idea how to do it.