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How to make Arduino triggered still camera? Answered

I'm looking for a simple way to make a camera using Arduino with the following properties and behavior: -when a certain signal from a sensor or switch gets to the Arduino it takes a single picture and sends it to some kind of memory, preferably a large one that can hold a lot but is small in form factor like an SD card or USB stick. -the camera is always on and waiting for input, allowing the image to trigger immediately upon sensor trigger -the whole thing would work with a fairly small form factor Arduino board, shield, and camera module -obviously camera quality is important, something that would give a reasonably clear image within a fifteen foot distance and in a variety of lighting conditions without a long time taken to focus would be ideal. It seems like most guides I've seen are for video cameras with a ton of options or other inputs. I just want a stupid simple camera that only returns one picture for one input, with an on off switch. Looking for product suggestions or pointers to guides to do this. I'm pretty inexperienced with Arduino. thanks so much!