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[...] does anybody have an idea how tomake a light sensing diode set out a signal for current to flow when suddenly inturrupted because of not recieving light for a moment?
and i have a pen laser light so i also need to know how i can connect it to the mains?? ive made a wall wart to regulate output till 12 volts.
...it makes your posts harder and quite annoying to read
Use a photodiode and an infrared diode config. Something like this...