a cheap solution for RPM?

[zeusmorg]

 Ok I found a possible solution to cheap rpm reading.

http://www.dealextreme.com/details.dx/sku.2682

  I haven't tested it, nor do I endorse  it. But hey for 5 bucks it has rpm readings, so no conversion from a MPH reading needed?

 I could see this as a cheap solution for windmills, or even building a home brewed anemometer. Ordered one to play with..

 

[Norm]

Yes....they really work I have 2 similar that

cost twice as much....but work quite well.

May get some more at that price !

I'm sure you'll have fun with it.....

thanks for the info !

 

[kc5etv]

Here is one that I found it is a PC program and just add a burglar alarm switch on the turbine and away you go.

http://www.hroch.net/sidparal/software/serialtacho/index.html

It has been work well on mine.