The **WADS-11B-R** is a specific model of an **Ultrasonic Wind Speed and Direction Sensor**. It is an industrial-grade, solid-state anemometer designed to measure wind conditions without moving parts, utilizing ultrasonic time-of-flight technology. --- ## 1. Core Technical Specifications The electronic architecture is designed for high precision and resistance to environmental interference. | Feature | Specification | | :--- | :--- | | **Measurement Principle** | Ultrasonic Time-of-Flight (4 transducers) | | **Output Signal** | RS485 (Modbus-RTU protocol) | | **Power Supply** | 12V to 24V DC | | **Wind Speed Range** | 0 to 60 m/s | | **Wind Direction Range** | 0 to 359° | | **Power Consumption** | < 0.2W (Standard) | | **Ingress Protection** | IP65 / IP66 | --- ## 2. Key Electronic Components ### A. Ultrasonic Transducers The unit contains four ultrasonic probes positioned in a square or circular array. * **Function:** They act as both emitters and receivers of high-frequency sound pulses. * **Mechanism:** By measuring the time it takes for sound to travel between probes in opposite directions, the internal processor calculates the wind vector. ### B. Digital Signal Processor (DSP) The "brain" of the WADS-11B-R is an integrated circuit (often an ARM-based microcontroller or dedicated DSP). * **Data Processing:** It filters out noise (like rain or bird sounds) and performs the trigonometric calculations to convert time-of-flight data into speed and degrees. * **Calibration:** Stores factory-set calibration curves to maintain accuracy across different temperatures. ### C. RS485 Communication Interface Unlike analog sensors that output varying voltage, the "R" in WADS-11B-R typically denotes a digital interface. * **Modbus-RTU:** The electronic board uses a transceiver chip (like the MAX485) to allow long-distance data transmission (up to 1200m) with high immunity to electromagnetic interference. ### D. Power Management Circuitry * **Voltage Regulation:** Converts the input 12-24V DC down to stable 3.3V or 5V for the internal logic. * **Protection:** Includes TVS (Transient Voltage Suppressor) diodes to protect the electronics against static electricity and minor surges common in outdoor installations. --- ## 3. Advantages of the Electronic Design 1. **No Mechanical Wear:** Because it lacks cups or vanes, there is no bearing friction or mechanical failure. 2. **Low Starting Threshold:** It can measure wind speeds as low as 0.01 m/s because it doesn't need to overcome physical inertia. 3. **Maintenance Free:** The electronic compensation accounts for environmental changes, requiring no routine lubrication or replacement of parts. --- ## 4. Wiring Configuration (Typical) Most WADS-11B-R units use a standard 4-wire aeronautical plug: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Red** | VCC | Positive Power (12-24V) | | **Black** | GND | Ground / Negative Power | | **Yellow** | RS485-A | Data Positive | | **Blue/Green** | RS485-B | Data Negative |