SP-WS02 Wireless Weather Station Kit (Wind Vane, Anemometer, Rain Gauge) - Passive Reed Switch Sensors

The SP-WS02 sensors are passive and contain no active electronics. They require an external voltage supply (typically 5V or 3.3V) to be applied through the RJ11 connector. The wind vane's resistor network will output a variable analog voltage, while the anemometer and rain gauge will act as switch closures to ground, producing digital pulses that your microcontroller can count.

The wind direction sensor outputs an analog voltage corresponding to one of 16 compass points. The wind speed sensor (anemometer) and the rain gauge output digital pulses—each revolution of the cups or each tip of the bucket closes a reed switch, sending a brief ground signal. These pulses can be counted using a microcontroller's digital input pin or external counter.

The rainfall sensor is pre-calibrated to tip at every 0.2794 mm of collected precipitation. Calibration involves software scaling: simply count the number of tips and multiply by 0.2794 to get total rainfall in mm. For higher accuracy over long periods, you can verify calibration by comparing total tips against a known volume of water poured into the collector.

The kit includes short and long mounting arms, a pair of metal pole clamps, and iron mounting rings. The pole clamps are typically designed to fit standard 1-inch (approximately 25 mm) diameter outdoor mast piping. The included screws and zip ties facilitate secure assembly and cable management.