Hi all,

I’m using an 18F452 Pic for a Dynamometer project. I have an amplifier feeding the a/d input on the Pic 0-5 volts. A count of 70 equals a foot-pound of torque. The problem I’m having is the torque is going to be less than 1 foot-pound and the RPM’s will be low most of the time. This means that the output and the formula will need to have decimal points in it.

Formula for Horse Power is: Horse Power = RPM x Torque (In Foot Pounds) / 5252

The example below is for 1500 RPM’s at a ½ pound of torque.
Example: (1500 rpm’s) x (35 x .0143) / 5252 = .1428 H.P.

What would be the best way to approach the Math for this application?

Thanks,
Mark