Now Serving vs Engine RPM

Ever have those days where everyone wants a piece of you? When your co-workers, your boss, your friends, your wife, your kids, etc. all want your help/opinion/whatever - and they all want it NOW! Based on the "Now Serving" boards found wherever there's a line-up, Now Serving lets you bring some order to your life and/or business. Now Serving could also be a great substitute for situations where an unexpected line-up forms and you want to keep some order - Garage Sales, Raffle Ticket Sales, etc. Now Serving is incredibly easy to use - simply tap on your device's screen, and the numbers go up by one. Make a mistake? Swipe down to decrease. Want to reset back to 00? Simply press and hold on the screen, and you're all set.

Measure the RPM of an engine by analyzing the sound it makes. Engine RPM listens to the sound of a running engine and uses advanced signal processing algorithms to extract the frequency of that sound and calculate the RPM. This app is primarily for setup and diagnostics of engines. After setting the the number of cylinders and whether the engine is a 2-stroke or 4-stroke engine, the app can work with any internal combustion engine, from diesel tractors to aircraft engines to motorcycles to chainsaws. To use the app you must set an expected RPM range to guide the analysis algorithms to the correct RPM. A real-time graph of the autocorrelation graph is displayed to help in troubleshooting and adjusting the expected RPM range. The analysis requires a clear sound from the engine without excessive interference from extraneous sounds. Do not expect to read the RPM of an engine while other things are making too much noise at the same time. The analysis also requires that the RPM be stable. It cannot read the RPM of an engine that is rapidly accelerating. For this reason, and because of the need for adjusting the expected RPM range, this app should not be considered a drop-in replacement for an operational tachometer. Setup options include update periods from 93 milliseconds to 1.5 seconds, one to 12 cylinders, 2-stroke or 4-stroke, low-pass filtering, and signal clipping. The overall RPM range is 400 to 90,000 RPM (although at any one time, the operational range is typically +/- 30% around a nominal expected RPM). Precision is usually about +/- 10 RPM.