Well, my first real test with water failed miserably. I bought a key chain laser pointer from one of those dollar stores. It costed me $1.40 or something like that for the laser pointer. I taped the laser pointer onto my tripod and pointed it at the photo-resistor. When I turned on the circuit, everything behaved as expected. The LED does not turn on as long as the laser beam hits the photo-resistor. If I run my finger quickly across the laser beam, the LED turns on and the flash would go off as expected. The only problem is that when I tried it with water, the water droplet either is too small or falls too quick. I could see half a flicker on the surface of the photo-resistor where the laser beam, but the half flicker was not sufficient to cause enough of a voltage change to trigger the LED and the flash.
I have to go back to the drawing board now.
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