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LDR+LED circuit

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green_tie8

New Member
hello all..
i wanna ask how to make a LDR+LED circuit.. means the LDR can count how much detect the LED...

the project something to count how much the fan can rotate if blow...
 

MikeMl

Well-Known Member
Most Helpful Member
Google "photo-interrupter"
 

green_tie8

New Member


i want make a circuit like this..
so i can count how much the fan is rotating...


can i change the LDR with something another sensor for detect much accurate..
because the fan rotating fast..
if can what type of sensor i need?
;)
 

MikeMl

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Most Helpful Member
Last edited:

MikeMl

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