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November 27th 05, 01:06 PM
posted to de.sci.electronics,rec.radio.amateur.homebrew,sci.electronics.components,sci.electronics.design
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Unusual functions of cheap parts
Am Sun, 27 Nov 2005 09:57:23 +0000 (UTC) schrieb Matthias Weingart
: Martin wrote in news 
To save power, use the LEDs of a backlight to measure the ambient light to decide to switch the backlight on or not. But how to decide to switch it off? I think there you have to sample - switch of for a short time and test. This could give a flickering backlight. Ok, you found the skeleton in the closet. :-) You can not use this method to switch it off - but it is not required in most cases. Think of a cell phone - the backlight goes on every time you press a key, and it is going off after 10 seconds. OK, so you can decide to not switch it on and save some mAs. -- Martin |
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