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laser beam alarm using NE555 ?? circuit question
hi all
my project idea : using laser beam and LDR to make a security alarm circuit , when the beam is cut , it will trigger the NE55 circuit for certain time (5 seconds only )
there is a lot of 555 dark-activated circuits on the WWW, i know , but all of them are like on/off switch
what i need is one with adjustable delayed time
can you help me ?? thanks in advance
Comments
9 years ago
i found one
http://www.youtube.com/watch?v=wDpw_OrBhNI
turned out that it was a stupid question :)
thanks anyway