best way to design fan blade counter

[Peter]

If I wanted to build a fan blade counter obviously to count the number of
times the blade has spun around, which would be the best way to design it?

Would a photodiode be fast enough (and strong enough) with a photo detector
on the other side of the blades?

I've never designed anything like this and wasn't sure where I'd even
start.

 

[Sid Phillips]

Attach a "chopper wheel" on the other end of the shaft.
It is an opaque colored wheel with one or more small slits in it.
Then, you can buy a sender/receiver diode pair that is already spaced
apart, made for the purpose. Then, all you need is the counter
circuit.

Putting such a thing in front of the blades would require that one
be out if the path of the fan's breeze. Also, ambient light source
reflections might give rise to errant counts.

 

[sQuick]

abso-fucking-lutely nothing


Do you always make retarded, zero response posts in which you edit
the nym of the poster that you make it appear you are attempting to
reply to?

Perhaps you are still too young or immature to be using a PC.

are you a Bizarre Dwarf?

Nicky P.