Wind Speed Sensor (Cup Type) RS485 Modbus 0–30 m/s

Specifications

• Operating Voltage: Standard
• Communication Interface: RS485 (Modbus RTU protocol)
• Measurement Range: 0 to 30 m/s
• Start-up Wind Speed: 0.4 m/s to 0.8 m/s
• Accuracy: ±(0.3 + 0.03V) m/s
• Output Signal: Digital RS485
• Default Device Address: 0x01
• Default Baud Rate: 4800 / 9600 bps
• Material: High-strength Polycarbonate/ABS blend
• Color: Black
• Cable Length: 1 meter

Minimum hardware

• RS485 to TTL Converter Module  essential to translate the sensor's industrial RS485 differential signals into standard RX/TX serial logic that your Arduino or ESP32 can read.
• 12V to 24V DC Power Supply  required because the sensor's internal circuitry is designed for industrial voltages and will not function if powered from a 5V microcontroller pin.
• Arduino Uno, ESP32, or PLC  to send the Modbus request frames and process the wind speed data response.

Safety Warnings

• Voltage Mismatch: Do NOT attempt to power this sensor from your microcontroller's 5V or 3.3V pins. It requires a dedicated 12V–24V DC power supply.
• Logic Level Safety: You must use an RS485 to TTL module between the sensor and your microcontroller. Connecting the sensor's A and B wires directly to your board's RX/TX pins will destroy the GPIO pins.

Accessories Included in the Box

• 1× RS485 Wind Speed Sensor (3-Cup Anemometer) with integrated 1-meter cable

Frequently Asked Questions

• Is the RS485 Wind Speed Sensor compatible with Arduino?
  Yes, it is fully compatible with Arduino when used alongside an RS485 to TTL converter module.
• Can I use this sensor with an ESP32 or Raspberry Pi?
  Yes, provided you use an RS485 to TTL module that operates safely at 3.3V logic levels.
• Does this sensor connect directly to industrial PLCs?
  Yes, the Modbus RTU RS485 output allows direct connection to standard PLC communication terminals.
• Can I chain multiple RS485 sensors on the same communication bus?
  Yes, you can daisy-chain multiple Modbus sensors on a single RS485 bus by assigning each a unique device address.
• What voltage is required to power the wind speed sensor?
  This industrial sensor requires a dedicated 12V to 24V DC power supply to operate correctly.
  
• Can I power this sensor from the 5V pin on my Arduino?
  No, a 5V supply is insufficient to power the sensor's internal circuitry and will result in failure to operate.
  
• How much current does the sensor draw during normal operation?
  The sensor typically draws very low current (often under 50mA), but a stable 1A power supply is recommended for the overall system.
• How do I connect the sensor to my microcontroller?
  You must connect the sensor's A and B wires to an RS485-TTL module, which then connects to your microcontroller's RX and TX pins.
  
• What is the standard pinout for the RS485 wires?
  Typically, the yellow or green wire is RS485 A (non-inverting), and the blue or white wire is RS485 B (inverting), though always verify with your specific batch's label.
  
• Do I need a common ground between the sensor power supply and my microcontroller?
  Yes, bridging the ground of your 12V-24V power supply and your microcontroller's ground is critical for stable signal conversion.
• Why am I getting garbage data or timeout errors from the sensor?
  This is usually caused by crossed A and B wires, a mismatched baud rate, or a missing common ground connection.
  
• Why is the wind speed reading always showing zero?
  Verify that your power supply is delivering at least 12V and that your Modbus read command is targeting the correct register.