[Greg McKaskle]

With counts and millisecs, you can get cpm by taking count * the number of millisecs in a minute divided by the millisecs you have. Or count * 60,000 / millisecs. Put that expression in the loop.

If you want an instantaneous reading, think about how often you want it to update, then look at keeping an array of values in an accumulator, sum the array, rotate and replace. I'll explain in more detail if you decide you want to do it, but I'll give you a chance to do it first.

Greg McKaskle