Ecowitt WS90 7-in-1 Ultrasonic (WittBoy Pro) Overview
Ultrasonic wind and haptic rain outdoor array for Ecowitt RF gateways
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The Ecowitt WS90 is a solid-state outdoor sensor array with ultrasonic wind measurement and a piezoelectric rain sensor. Per Ecowitt documentation it must pair with a separate GW-series gateway for Wi-Fi, Ethernet, and Home Assistant integrations.
Specifications and compatibility notes are based on manufacturer documentation — not independent Atmosiva testing.
Known limitations
- •Amazon ASIN B0BGKGR17W is the sensor-only listing — bundles with GW2000/GW3000 use different ASINs
- •Rain accuracy can vary with drop size and wind per Ecowitt documentation
Expansion options
- •WH51 soil moisture probes for garden and irrigation guides
- •WH57 lightning detector add-on
- •WH41/WH45 air quality sensors on supported gateways
Pros
- + Solid-state wind and rain sensing without mechanical cups or tipping buckets (per Ecowitt specs)
- + Pairs with GW2000/GW3000 for documented local Home Assistant paths
- + Supports a large catalog of optional WH/WN add-on sensors
- + No subscription required for local gateway operation
Cons
- − Not a standalone station — requires a separate Ecowitt gateway
- − No included countertop console on the sensor-only SKU
- − 915 MHz US / 868 MHz EU regional models must match your gateway
Technical Specifications
Ultrasonic (0–89 m/s, ±3% per Ecowitt spec)
Piezoelectric haptic sensor
±0.3°C, ±3% RH (SHT35 per Ecowitt spec)
915/868 MHz RF to GW2000/GW3000; gateway provides Wi-Fi/Ethernet and LAN HTTP API
Home Assistant (Ecowitt integration + official HACS), MQTT, Ecowitt.net upload via gateway
Solar panel with supercapacitor + AA lithium backup
~8.8 s wind and rain updates (per Ecowitt documentation)
Compatibility & Integrations
Sensor Capabilities
Ultrasonic wind, piezoelectric rain, temp/humidity, solar radiation, UV, light
Smart Home
- Home Assistant: Yes
- Weather Underground: Yes
- Alexa: No
- Rachio: No
- API Support: Yes
Home Assistant (Ecowitt integration + official HACS), MQTT, Ecowitt.net upload via gateway
Connectivity
- Wi-Fi: No
- Ethernet: No
- Bluetooth: No
- Local Data: Yes
- Cloud Required: No
- Subscription Required: No
The Ecowitt WS90 is a solid-state outdoor sensor array with ultrasonic wind measurement and a piezoelectric rain sensor. Per Ecowitt documentation it must pair with a separate GW-series gateway for Wi-Fi, Ethernet, and Home Assistant integrations.
Home Assistant users who want modular outdoor sensing with documented Ecowitt gateway integrations
- • Ultrasonic anemometer (0–89 m/s range per Ecowitt spec)
- • Piezoelectric haptic rain sensor
- • Solar power with battery backup
- • 915/868 MHz RF to Ecowitt gateway
Related Comparisons
Ecowitt WS90 
Ambient Weather Ecowitt vs Ambient Weather: Local Home Assistant vs All-in-One Console
Ecowitt WS90 with a GW2000/GW3000 gateway is a better fit when you want documented local Home Assistant integrations and modular sensor expansion. Ambient WS-5000 is a better fit when you want a polished console bundle with integrated display and are comfortable with AmbientWeather.net for cloud features — using Custom Server community tools if you require local push.
Ecowitt WS90 
Tempest Weather Ecowitt WS90 vs Tempest: Modular Gateway vs All-in-One Smart Home
Ecowitt WS90 with a GW2000/GW3000 gateway fits buyers who want documented local Home Assistant integrations and modular add-on sensors such as soil moisture probes. Tempest fits buyers who want a single outdoor unit with built-in lightning detection and documented Rachio smart irrigation integration.
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