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Remember those bright annoying LED lights you see in all
those consumer electronics?
Well the concept is simple. If you opened up an LED
candle
these days, you will notice that it is only a single LED
with
a tiny chip embedded inside of it.
Well why not have an LED that can sense the
light level
and
adjust brightness accordingly. Include a small
photodetector, and a
micro-controller to auto dim the LED when darkness is
detected.
Not every electronics is complex or expensive enough to
warrant an autodimming circuit. For those kinds of
electronics, just use these auto dimming LED and make
your device less annoying..
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Annotation:
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If it were PWM, the LED itself could act as the sensor. |
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[+] One of my synths combines a rock-solid hardware design with a rock-solid class-action lawsuit firmware - one of which tasks is to make sure that, in low or normal lighting conditions, the player is effectively blinded by superfluous LED's and an undimmable EL-backlit LCD. |
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Excellent idea. The LED would have to avoid
being blinded by its own light, but this could be
done by either (a) having the light sensor filtered
against the relatively narrow band of emission
from the LED itself or (b) Pulse the LED fast
enough to look continuous, but sense ambient
light during the "off" windows. |
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Slight caveat: a lot would depend on the context
of the LED (eg, if it's exposed or recessed). |
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Yes, please, someone do it [+] |
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This is so timely. I just bought a desktop charger/stand for my smartphone to go on my bedside table. The phone itself considerately dims down to a dull red clockface when I put it in bedside bode but the charger stand has a blue LED which could blind low-flying pilots. I covered it up with black tape but can still detect the light coming through at a sensible level. I'm toying with trimming the tape to make some sort of bat signal. |
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