Can I supply 5V to the 4.5V laser pointer without problems? I tested it with one I have at home, and it worked, will it work again, for longer times?
I read that a reference value for the photoresistor's value should be taken (reference: with normal light (either day or night); and the one the laser lights on). These values can be compared, but how should I compare them? What about: if v1~v2 then alarm, that means if they have circa the same value. I could say "abs(v1-v2 )< 50 then alarm", what about this ? Calibration wouldn't work because the room I am speaking about changes its brightness during the day very much.
I already also heard, that the batteries are a bit more than 1.5V, maybe 1.6V or 1.7V. A new "1.5V"-battery I measured had a bit more than1.6Volts. That means that 1.6V*3=4.8V should be definitely still in the acceptable range for the laserpointer. Most of them are from China and hence don't have a manual with technical parameters.