# Weather meter kit (anemometer, vane, rain gauge)

Manufacturer: SparkFun  |  MPN: SEN-15901  |  Category: weather-instrument
Canonical: https://partsgraph.ai/catalog/parts/sparkfun-weather-meters
Image: https://partsgraph.ai/catalog/img/sparkfun-weather-meters.jpg (photo: SparkFun, CC BY 2.0; sha256 d029e43cf27d)

## Attributes (each with provenance)

- **Wind speed calibration**: 2.4 km/h
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 1) sha256:3e5acbd6b0ba
  - quote: "a contact as a magnet moves past a switch. A wind speed of 2.4km/h causes the switch to close once per second. The anemometer"
- **Rain per tip**: 0.2794 mm
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 1) sha256:3e5acbd6b0ba
  - quote: "The rain gauge is a self-emptying tipping bucket type. Each 0.2794mm of rain cause one momentary contact closure that can be rec"
- **Wind speed per closure/sec**: 1.492 MPH
  - source: https://www.sparkfun.com/weather-meter-kit.html
  - quote: "peed by closing a switch once per rotation. A wind speed of 1.492 MPH generates exactly one switch closure per second. Wind Vane:"
- **Wind speed per closure/sec (m/s)**: 0.33 m/s
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 1) sha256:3e5acbd6b0ba
  - quote: "1-terminated cable. Anemometer 杯式风速计测量风速的方法是当磁铁通过开关时关闭触点。风速 0.33m/s 导致开关关闭一次. 风速计将连接到风向计上，与风向计公用 RJ11 电缆，风速计占用 RJ11 水晶头的 2、3 脚。"
- **Rain per tip (inches)**: 0.011 "
  - source: https://www.sparkfun.com/weather-meter-kit.html
  - quote: "et mechanism activates a momentary button closure for every 0.011" (0.2794 mm) of rain collected. Anemometer: Measures wind sp"
- **Wind vane positions**: 16
  - source: https://www.sparkfun.com/weather-meter-kit.html
  - quote: "internal resistors. While it can technically indicate up to 16 positions, it reliably resolves eight cardinal directions ("
- **Wind vane switches**: eight switches
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "d vane is the most complicated of the three sensors. It has eight switches, each connected to a different resistor. The vane’s magnet"
- **Vane resistance at 0° (ohms)**: 33K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "Direction Resistance (degrees) （ohms） 0 33K 22.5 6.57K 45 8.2K 67.5 891 90"
- **Connector**: RJ11
  - source: https://www.sparkfun.com/weather-meter-kit.html
  - quote: "E, E, etc.). Easy Integration All sensors are supplied with RJ11-terminated cables for clean, modular connections. While som"
- **Sealed magnetic reed switches**: yes
  - source: https://www.sparkfun.com/weather-meter-kit.html
  - quote: "the sensors uses active electronics; instead, they rely on sealed magnetic reed switches and passive components. This means you won’t need any compl"
- **Vane resistance at 45° (ohms)**: 8.2K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "（ohms） 0 33K 22.5 6.57K 45 8.2K 67.5 891 90 1K 112.5 688 135"
- **Vane resistance at 90° (ohms)**: 1K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "6.57K 45 8.2K 67.5 891 90 1K 112.5 688 135 2.2K 157.5 1.41K 18"
- **Vane resistance at 135° (ohms)**: 2.2K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "891 90 1K 112.5 688 135 2.2K 157.5 1.41K 180 3.9K 202.5 3.14K"
- **Vane resistance at 180° (ohms)**: 3.9K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "688 135 2.2K 157.5 1.41K 180 3.9K 202.5 3.14K 225 16K 247.5 14.12K"
- **Vane resistance at 225° (ohms)**: 16K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "1.41K 180 3.9K 202.5 3.14K 225 16K 247.5 14.12K 270 120K 292.5 42.12"
- **Vane resistance at 270° (ohms)**: 120K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "3.14K 225 16K 247.5 14.12K 270 120K 292.5 42.12K 315 64.9K 337.5 21.8"
- **Vane resistance at 315° (ohms)**: 64.9K
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "4.12K 270 120K 292.5 42.12K 315 64.9K 337.5 21.88K 表中给出了所有 16 个可能位置的电阻值。 The wind vane is"
- **Rain gauge type**: self-emptying tipping bucket
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 1) sha256:3e5acbd6b0ba
  - quote: "录翻斗次数,在 RJ11 水晶头的一端需连接一个电阻电 容，如图所示： The rain gauge is a self-emptying tipping bucket type. Each 0.2794mm of rain cause one momentary contact clo"
- **Contains active electronics**: no
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 1) sha256:3e5acbd6b0ba
  - quote: "e, with associated mounting hardware .These sensors contain no active electronics, instead using sealed magnetic reed switches and magnets to"
- **External voltage required for output**: yes
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 1) sha256:3e5acbd6b0ba
  - quote: "ed magnetic reed switches and magnets to take measurements. A voltage must be supplied to each instrument to produce an output. Assembly The wind"
- **Anemometer RJ11 pins**: pins 2 and 3
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 2) sha256:3e5acbd6b0ba
  - quote: "of the RJ 11 cable shared by the anemometer and wind vane(pins 2 and 3) Wind Vane 风向计它有八个开关，每个开关连接到一个不同的电阻器。叶片的磁铁可以同时关闭两个开 关，使多达"
- **Rain gauge switch wiring**: two center conductors
  - source: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (page 1) sha256:3e5acbd6b0ba
  - quote: "ler interrupt input. The gauge’s switch is connected to the two center conductors of the attached RJ 11-terminated cable. Anemometer 杯式风速计测量风"
- **Reliably resolved directions**: eight cardinal directions
  - source: https://www.sparkfun.com/weather-meter-kit.html
  - quote: "chnically indicate up to 16 positions, it reliably resolves eight cardinal directions (N, NE, E, etc.). Easy Integration All sensors are supplied"
- **California Prop 65 warning**: yes
  - source: https://www.sparkfun.com/weather-meter-kit.html
  - quote: "reproductive harm. See link below for more information. www.P65Warnings.ca.gov Reviews Customer Reviews Trustpilot Get a Quote for"

## Vendors

- SparkFun: https://www.sparkfun.com/weather-meter-kit.html (~USD 79.95, indicative as of 2026-08-18)
- The Pi Hut: https://thepihut.com/products/sparkfun-weather-meter-kit (~GBP 76.8, indicative as of 2026-08-18)

## Datasheets

- Weather meter datasheet: https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdf (sha256 3e5acbd6b0ba)

Used in builds: weather-station (roles: wind-rain)

Machine feed of the whole catalogue: https://partsgraph.ai/catalog/feed.json