{"title":"Cup Anemometer with RJ11 Connector","handle":"anemometer","url":"/products/anemometer","description":"This anemometer measures wind speed using rotating cups that turn an enclosed magnet. On each rotation, the magnet closes a reed switch, producing a simple pulse output that can be counted by your electronics.The output is available on the two inner conductors of the RJ11 connector, pins 2 and 3. Connect it to a digital counter or to interrupt-capable pins on a microcontroller to measure switch closures over time.To convert the pulse rate into wind speed, use the supplied conversion of 1 switch closure per second equals 1.492 mph, or 2.4 km/h.This is the same anemometer used with the SparkFun Weather Meter Kit, making it suitable for weather station builds, environmental monitoring and maker projects.Specifications:Measurement: Wind speedSensor mechanism: Rotating cups with enclosed magnet and reed switchConnector: RJ11Output conductors: Two inner conductors of the RJ11 connectorOutput pins: Pins 2 and 3Output type: Reed switch closure on each rotationInterface: Digital counter or interrupt pins on a microcontrollerConversion: 1.492 mph = 1 switch closure/secondMetric conversion: 2.4 km/h = 1 switch closure/secondWeather Meter Kit: Same anemometer used with the Weather Meter Kit","vendor":"SparkFun","product_type":"Wind Speed Sensor","in_stock":true,"options":[],"variants":[{"id":16003,"title":"Default Title","sku":"SF-SEN-28869","mpn":"SEN-28869","price":21.55,"on_sale":false,"in_stock":true,"available_quantity":9}]}