Anemometer with ceramic ball bearing and hall element, completely waterproof

thingiverse

A simple device for measuring wind speed consists of a rotating assembly that can detect extremely low winds due to its low friction ceramic ball bearing. The screws holding this bearing in place must be precisely 15 mm long to ensure the ball bearing remains securely fixed. When attaching the hall sensor and magnets, superglue is recommended. After securing the hall sensor inside the base cavity with hot glue, seal it further with additional hot glue, taking care to trim any excess with a sharp knife to avoid unevenness. The anemometer's base features a hall sensor, requiring one magnet to face its north pole towards the hall element and the other facing its south pole in the opposite direction. This configuration ensures accurate readings. Additional components needed include: 1 x ceramic ball bearing (type: 608 ZZ, size: 8 x 22 x 7 mm) for low friction operation. 1 x hall sensor IC US1881 (latching type) for precise measurement. 2 x strong cylinder disc magnets (size: 8 x 3mm Neodymium) to detect rotations. 1 x self-tapping screw (4.5 x 50 mm) for ball bearing mounting. 8 x small self-tapping screws (2.2 x 15 mm) for securing cup arms and ball bearing. Important: When assembling the anemometer, ensure the ball bearing is not inserted into the top part without a 4.5 x 50 mm screw or another method to remove it later, as this can result in difficulty extracting the bearing due to its tight fit. To operate the hall sensor, apply ground and +5 volts; it will output a TTL pulse for each rotation, compatible with Arduino or Raspberry Pi devices. The anemometer can be mounted on a rod or pole with dimensions 25 x 25 mm. All printed components can be produced without support as long as they are positioned according to the provided images. Slight sanding of the inside bottom of the cups may be necessary due to high overhang in this area. To calculate wind speed, use the circumference (78.2256 cm) corresponding to a radius of 12.45 cm from the center of the cups.