Optical Rpm Sensing

I am doing nothing other than playing. I started using Arduinos and if I can build something useful with them then I do. And it looks cool, when I first got the variable speed control sorted out I only had a rheostat with numbers marked out for an approx RPM. Worked but there was no cool factor, look at my forum pic to see the control before the digital display is installed. Currently I am slowly gathering the parts for a DRO using a TI Launchpad and an old android phone. Do I need it, no. Do I want build it, yes.

Ah, I get that. It does sound cool. And that is reason enough. I was just curious if you were doing something where you needed to know the exact rpm. Good luck with your project.

RPM Display/Start-Stop Control is finished, in the avatar pic the RPM numbers are a bit washed from the camera. Bright and very readable in person. Buttons light up when relevant, Green to run and Red to stop.

I, a certified GOF, feel you all are having too much fun discussing beautiful
theories; sharpen a couple of tools and back to work.........BLJHB