Is it possible to fire the flash (LED) on my iPhone 5(s) without taking a photo? (i.e. is there a programmatic interface to turn the LED on/off via an ObjC message send? Can I talk to it directly using C? Also, does iOS have OpenCV, or something like it, so the camera can detect flashing lights (either from the "flash" LED on another smartphone, or even a flashlight)? I'd like to make a simple morse code sender/receiver using a pair of iPhones that have the "flash" LED, and the camera. The initial version would just have a UIView with a UIButton the user could tap to turn the LED on, and a UIImage (?) showing the current "view" the camera sees, and - under that - a UILabel showing the translated morse code as the user taps the button. Later, I'd like to have two UILabels, one for sending and one for receiving, so that it would also translate the incoming messages as well, by detecting the flashing with the camera itself. This is why I'm guessing I'll need OpenCV library. If not, no biggie.
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