Engine RPM vs Spin Counter Plus

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.

Spin Counter is a utility tool to find the rotation count fast and easy. This app uses magnetic sensor to get compass orientation data and calculate spin count. Features: • 3D compass shows current orientation. • Toggle Tap to start or stop record compass orientation data. • Save Rotation Data Image into camera roll. • Copy Rotation Data to Clipboard for advance operation. • Show Total rotations in seconds. • Show average, fastest and slowest rotation speed in second and RPM. Sample Rotation Data: [253.035686492919922, 250.90165710449219, ... , 180.697193145751953] These are the raw data from device magnetic sensor with each value 0.01 sec interval, meaning that it took 0.01 seconds from angle 253.035686492919922 to 250.90165710449219. Example Usage: - Count Ballet Dancer Spin with the device in a pocket. - Count Skating spins with the device in a pocket. - Count fun fair spinning ride speed. - Any sport activity involving circular motion, such as car drifting etc. - And anything base on your imagination. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.