G green_tie8 New Member Jul 28, 2009 #1 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...
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...
G green_tie8 New Member Jul 28, 2009 #3 **broken link removed** 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?
**broken link removed** 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 Well-Known Member Most Helpful Member Jul 28, 2009 #4 Phototransistor or Photodiode both have a much faster response than a photo-sensitive-resistor. Last edited: Jul 28, 2009
G green_tie8 New Member Jul 28, 2009 #5 can u show me the circuit .... i search but not found the complete circuit..
MikeMl Well-Known Member Most Helpful Member Jul 29, 2009 #7 Some PhotoTransistor circuits, found with Google, "phototransistor schematic". Try it.