Ecowitt WS90 Firmware Release Notes

WS90 Firmware V1.5.8 Upgrade 2025-8-28

Optimized wind speed measurement.
Fixed an issue where a sensor error could potentially cause the device to freeze.

WS90 Firmware V1.5.7 Upgrade 2025-8-8

Automatic wind speed zero calibration in windless conditions.

WS90 Firmware V1.5.6 Upgrade 2025-6-3

Optimize rainfall measurement to prevent the occurrence of some incorrect rainfall.

WS90 Firmware V1.5.4 Upgrade 2025-4-1

The Modbus version now supports storing the last 30 minutes of historical data, with one data point stored per minute.

WS90 Firmware V1.5.3 Upgrade 2025-3-24

Optimized the handling of ultrasonic measurement abnormalities.

WS90 Firmware V1.5.2 Upgrade 2025-3-3

Optimized the handling of abnormal wind speed measurement.
Fix ModelBus version air pressure not being updated.

WS90 Firmware V1.5.1 Upgrade 2025-2-4

Optimized temperature compensation at -10°C.

WS90 Firmware V1.5.0 Upgrade 2025-1-24

Optimized rainfall measurement.

WS90 Firmware V1.4.9 Upgrade 2024-12-30

Optimized the temperature and humidity compensation algorithm.
Optimized the light sensor algorithm.
Optimized the light rain detection algorithm to reduce false readings caused by fog.

WS90 Firmware V1.4.8 Upgrade 2024-11-28

Supports the new T&H module hardware with dual T&H compensation.

WS90 Firmware V1.4.7 Upgrade 2024-09-26

Optimized the ultrasonic sensor for wind speed measurement.
Optimized the wind speed algorithm to enhance accuracy.
Optimized rainfall measurement.

WS90 Firmware V1.4.3 Upgrade 2024-04-15

Optimized wind speed measurement. To ensure accuracy with the upgrade, a recalibration to zero is required for it to take effect.

WS90 Firmware V1.3.8 Upgrade 2023-10-25

Optimized wind speed measurement.
Optimized rainfall measurement.
Press the CAL button three times in quick succession to toggle the LED on/off.

WS90 Firmware V1.3.3 Upgrade 2023-04-17

Optimized rain detection algorithm.

WS90 Firmware V1.3.2 Upgrade 2023-03-29

Optimized for rain condition wind measurement algorithm, overcoming the issue where the sensor stops reading wind when water comes to the transducer surface.
Optimized for MODBUS version to include active measurement commands for faster reading speed (up to 8 sampling per second).
Battery voltage measurement is possible when 12v heater power is applied for hardware version v2.0 and later. Early versions prior to hardware v2.0 cannot measure battery voltage with external 12v heater power.

WS90 Firmware V1.3.0 Upgrade 2023-01-20

Optimized low/no wind speed detection algorithm.

WS90 Firmware V1.2.6 Upgrade 2022-09-21

Lowered drizzle rain detection sensitivity compared to v1.2.5. Upgrade is recommended only for users experiencing extra counts during mist rain conditions if v1.2.5 was working correctly.

WS90 Firmware V1.2.5 Upgrade

32K XTAL working state check after power on. If external timing crystal is not working, it switches to the internal timing clock, enhancing robustness.
Increased mist or drizzle rain sensitivity. It is recommended to set Rain1 gain to 0.75 with a GW2000 hub or HP25** console series.
Tuning for stormy rain sensitivity alignment.

WS90 Firmware V1.2.3 Upgrade

Increased sensitivity for mist and drizzle rain detection.
Sensitivity for high rain rate adjusted for better linearity.
Users should reset all rain gain settings to 1.0 after upgrading to this version, as the sensitivity for rain detection has been decreased. Recalibration may be needed.

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Ecowitt WS90 Firmware Release Notes

WS90 Firmware V1.5.8 Upgrade 2025-8-28

WS90 Firmware V1.5.7 Upgrade 2025-8-8

WS90 Firmware V1.5.6 Upgrade 2025-6-3

WS90 Firmware V1.5.4 Upgrade 2025-4-1

WS90 Firmware V1.5.3 Upgrade 2025-3-24

WS90 Firmware V1.5.2 Upgrade 2025-3-3

WS90 Firmware V1.5.1 Upgrade 2025-2-4

WS90 Firmware V1.5.0 Upgrade 2025-1-24

WS90 Firmware V1.4.9 Upgrade 2024-12-30

WS90 Firmware V1.4.8 Upgrade 2024-11-28

WS90 Firmware V1.4.7 Upgrade 2024-09-26

WS90 Firmware V1.4.3 Upgrade 2024-04-15

WS90 Firmware V1.3.8 Upgrade 2023-10-25

WS90 Firmware V1.3.3 Upgrade 2023-04-17

WS90 Firmware V1.3.2 Upgrade 2023-03-29

WS90 Firmware V1.3.0 Upgrade 2023-01-20

WS90 Firmware V1.2.6 Upgrade 2022-09-21

WS90 Firmware V1.2.5 Upgrade

WS90 Firmware V1.2.3 Upgrade

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