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PhotoDiode vs LDR for fast laser pointer detection?
I am trying to make a circuit to fire my camera flash when a laser pointer beam is broken with minimal delay so it will work at something like 1/4000 sec.
Looking on wikipedia It said that a photodiode has less delay than a light dependant resistor and a PIN photodiode what better than a PN photodiode.
When I look to buy on uk.farnell.com they are only listed as photodiodes not PN or PIN. What is it I need? An LDR, PhotoDiode or photoresistor and how do i get the right type? I want to use a pic16F to detect the difference in like in daytime with the laser pointing at it or not pointing at it..
Thanks for your time 
A photodiode will be plenty fast. I would guess almost any photodiode will give you millisecond timing resolution as you request. In fact, almost any photodiode should be able to do a factor of one thousand better than that (microsecond resolution). You would need a fast photodiode to get nanosecond resolution, but you don' need that. The more important issue will be electronics for detecting the photodiode and firing the flash. I'm not sure if you are asking about the photodiode itself, or if you are looking for a packaged photodiode. But either way, a millisecond is quite slow on electronics time scales. I would be surprised if you could find a photodiode that is too slow for you.
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Filed under Radar Detectors by on Mar 23rd, 2010. Comment. 
