SparkFun
Cup Anemometer with RJ11 Connector
· MPN: SEN-28869
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 p...
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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 speed
- Sensor mechanism: Rotating cups with enclosed magnet and reed switch
- Connector: RJ11
- Output conductors: Two inner conductors of the RJ11 connector
- Output pins: Pins 2 and 3
- Output type: Reed switch closure on each rotation
- Interface: Digital counter or interrupt pins on a microcontroller
- Conversion: 1.492 mph = 1 switch closure/second
- Metric conversion: 2.4 km/h = 1 switch closure/second
- Weather Meter Kit: Same anemometer used with the Weather Meter Kit
Jargon buster
Plain-language definitions for the technical terms used above.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- Reed switch
- A small switch sealed in glass that opens or closes when a magnet is nearby. It is useful for simple door, lid, wheel, or position sensing because it can detect motion without needing to be pressed directly.
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Cup Anemometer Mechanical Drawing
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