LED Machine Tach For Tired Eyes

[Archangel]

EDIT: I forgot to mention that it displays only in multiples of 60. ie: 60,120,180,240, etc. RPM. Not "linear", I left the formula as displays=(displays*60) as that's all I need for the way I'll have it attached to the first machine I use it on.

I never noticed that, I will look into it.
EDIT: Ok I think it is Displays = Displays * 60 If you use 6 magnets and make this statement Displays = (displays * 10) you will get 10 RPM resolution. I plan to use a multiple pulse per revolution encoder scheme which will significantly increase resolution. I think I will build it using parts from an automotive distributor (the guts) and fabricate all of the rest.