I'm desperately looking for the title and author of a book I read sometime in the early 90's, I believe. I don't remember the characters names, but I vaguely remember the plot. I believe it was set in the south around civil war era, possibly earlier than that. The main heroine met a man, fell in love, had a "best friend" who turned on her. The best friend and her lover kidnapped the heroine, hung her from a ceiling by her arms, abused her andcaused the heroine to lose her baby. I seem to recall that the heroine's husband found out where she was and rescued her by shooting the best friend's lover in the groin area, I think. I think they killed the friend, also. Any help would be greatly appreciated!!! Thanks!
Since LEDs can also be used as photodiodes, they can be used for both photo emission and detection. This could be used in for example a touch-sensing screen that register reflected light from a finger or stylus.