Referi vs Glider Frequency

"Referi" is a multi-platform application to track the score in the following sports: Tennis, Padel, TableTennis(Ping pong), TouchTennis, TeqBall, PadBol,VolleyBall, Badminton, PickleBall. It's dedicated to amateurs and semi-professionals of sport. The application can be controlled remotely, using one or more BlueTooth BLE buttons (to be purchased separately) worn by the players, effectively replacing an external referee. MAIN FEATURES: - Bluetooth Low Energy button connection (ø36mm, 12g, wrist-worn, 50m range, USB rechargeable battery) - utterance of the score, change of field, names of the players, with the chosen voice (Text-To-Speech) - choice of player to serve and reception at the beginning of the Set - remote score correction (UnDo) - save Matches locally and on the web: https://referi.azurewebsites.net/Account/Login - collection of match statistics - sharing of match statistics - Coin flip: serve and court choice at the start of each game - end-of-Match alarm MATCH CONFIGURATION: Matches can be configured in a wide range of values, for Sets, Games, final Set management, court changes, etc. We have tried to include all the variations commonly used for each sport. If you have any suggestions or requests for additions to the score setting, write to us: we will add your solutions. PLATFORMS: - multi-platform (mobile phones and tablets). See other OS: https://www.referi.io - available in Italian and English (the score can also be given in French, Spanish and Portuguese) https://www.iubenda.com/terms-and-conditions/95951212

Fix your phone to anything that vibrates and measure its frequency in Hz or per minute. Glider wings, wing beats, machine vibration, springs, flexing boards — anything that repeats. FEATURES - Finds the frequency by running an FFT on the accelerometer waveform - Estimates down to 0.01 Hz with a Hann window, zero padding and peak interpolation - Automatically removes the effect of tilt - Real-time frequency spectrum and confidence level - 10-second average - Adjustable analysis window (5, 10 or 20 s), sensor axis and minimum frequency - Built-in tutorial for first-time users HOW TO USE 1. Fix the phone firmly to the object, screen facing up 2. Press Start to begin a 3-2-1 countdown 3. Start the vibration and the frequency appears Measurement range is roughly 0.5–50 Hz.