Demo catalogue / Weather instruments
Weather meter kit (anemometer, vane, rain gauge)
SparkFun · MPN SEN-15901 · agent-readable version
$79.95indicative · 2026-08-18
Captured from SparkFun's own structured data on the date shown — not a quote. Availability is deliberately not claimed.
| SparkFun | $79.95 · 2026-08-18 | product page ↗ |
| The Pi Hut | £76.80 · 2026-08-18 | product page ↗ |
Weather meter datasheetsha256 3e5acbd6b0ba…
Specifications — every value carries its receipt
Electrical
| Contains active electronics | no | datasheet p.1“e, with associated mounting hardware .These sensors contain no active electronics, instead using sealed magnetic reed switches and magnets to” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| External voltage required for output | yes | datasheet p.1“ed magnetic reed switches and magnets to take measurements. A voltage must be supplied to each instrument to produce an output. Assembly The wind” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
Performance
| Wind speed per closure/sec | 1.492 MPH | vendor page“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 | datasheet p.1“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。” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Rain per tip (inches) | 0.011 " | vendor page“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 | vendor page“internal resistors. While it can technically indicate up to 16 positions, it reliably resolves eight cardinal directions (” |
| Reliably resolved directions | eight cardinal directions | vendor page“chnically indicate up to 16 positions, it reliably resolves eight cardinal directions (N, NE, E, etc.). Easy Integration All sensors are supplied” |
Interface
| Wind vane switches | eight switches | datasheet p.2“d vane is the most complicated of the three sensors. It has eight switches, each connected to a different resistor. The vane’s magnet” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Vane resistance at 0° (ohms) | 33K | datasheet p.2“Direction Resistance (degrees) （ohms） 0 33K 22.5 6.57K 45 8.2K 67.5 891 90” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Connector | RJ11 | vendor page“E, E, etc.). Easy Integration All sensors are supplied with RJ11-terminated cables for clean, modular connections. While som” |
| Vane resistance at 45° (ohms) | 8.2K | datasheet p.2“（ohms） 0 33K 22.5 6.57K 45 8.2K 67.5 891 90 1K 112.5 688 135” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Vane resistance at 90° (ohms) | 1K | datasheet p.2“6.57K 45 8.2K 67.5 891 90 1K 112.5 688 135 2.2K 157.5 1.41K 18” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Vane resistance at 135° (ohms) | 2.2K | datasheet p.2“891 90 1K 112.5 688 135 2.2K 157.5 1.41K 180 3.9K 202.5 3.14K” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Vane resistance at 180° (ohms) | 3.9K | datasheet p.2“688 135 2.2K 157.5 1.41K 180 3.9K 202.5 3.14K 225 16K 247.5 14.12K” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Vane resistance at 225° (ohms) | 16K | datasheet p.2“1.41K 180 3.9K 202.5 3.14K 225 16K 247.5 14.12K 270 120K 292.5 42.12” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Vane resistance at 270° (ohms) | 120K | datasheet p.2“3.14K 225 16K 247.5 14.12K 270 120K 292.5 42.12K 315 64.9K 337.5 21.8” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Vane resistance at 315° (ohms) | 64.9K | datasheet p.2“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” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Anemometer RJ11 pins | pins 2 and 3 | datasheet p.2“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” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Rain gauge switch wiring | two center conductors | datasheet p.1“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” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
Mechanical
| Sealed magnetic reed switches | yes | vendor page“the sensors uses active electronics; instead, they rely on sealed magnetic reed switches and passive components. This means you won’t need any compl” |
| Rain gauge type | self-emptying tipping bucket | datasheet p.1“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” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
Compliance & certification
| California Prop 65 warning | yes | vendor page“reproductive harm. See link below for more information. www.P65Warnings.ca.gov Reviews Customer Reviews Trustpilot Get a Quote for” |
General
| Wind speed calibration | 2.4 km/h | datasheet p.1“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” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
| Rain per tip | 0.2794 mm | datasheet p.1“The rain gauge is a self-emptying tipping bucket type. Each 0.2794mm of rain cause one momentary contact closure that can be rec” https://cdn.sparkfun.com/assets/d/1/e/0/6/DS-15901-Weather_Meter.pdfsha256 3e5acbd6b0ba… |
Used in
weather-station — as wind-rain