Two blades anemometer

thingiverse

This DIY anemometer is designed to be paired with a smartphone, specifically an android phone. The anemometer features a high-quality bearing, sourced from the head of an old HDD disk, which allows for precise rotation with minimal friction. The base of the rotor contains two rare earth magnets, measuring 4mmx2mm, which induce a variation in the magnetic field as it rotates. This change can be detected by the magnetometer in most smartphones, enabling accurate measurement of wind speed. An android app has been developed to accompany this anemometer, utilizing Fast Fourier Transform to calculate rotation speeds with precision. The app also allows for calibration using GPS data from your smartphone, making it a straightforward process to achieve high accuracy. To calibrate the anemometer, simply attach it to an electric bike and drive at various constant speeds while capturing data alongside quality indicators. Once collected, you can use Excel to fit a curve and achieve near-perfect calibration. While this anemometer is functional, it does require significant wind to initiate rotation. A new design featuring a traditional 3-cup shape is currently in development and will be posted soon. Stay tuned for updates on this project by visiting the provided link: https://www.thingiverse.com/thing:2527455 It's worth noting that this concept is not original; Vaavud, a company specializing in wind meters, offers similar anemometers available for purchase at https://vaavud.com/products/wind-meters/.