RS485 Wind Speed Measuring Device

The DFRobot wind speed transmitter (cup anemometer) measures the horizontal wind speed from 0 to 32.4 m/s with a Hall sensor and outputs it via RS485 with Modbus RTU. Housing and cups are made of die-cast aluminium, the electronics are protected against weather, and the cable connection is a corrosion-resistant circular connector. The sensor is connected to an Arduino or ESP32 via an RS485 to UART converter, and to a PC or Raspberry Pi via a USB to RS485 converter.

Note: The wind direction and wind speed transmitters both have Modbus address 2 by default. To operate them on the same bus, change the address of one sensor (register 0x1000).

Recommended Accessories:

• DFRobot RS485-to-UART Module with Active Isolation
• USB to RS485 Converter Module
• 12V DC 4000mA Power Supply AC/DC Adapter 5.5mm/2.1mm Plug
• DC Socket Female Barrel Jack 5.5mm / 2.1mm with Screw Terminals

Features:

• Measuring range 0 to 32.4 m/s
• Accuracy ±0.3 m/s
• Start-up wind speed 0.2 to 0.4 m/s
• Low-inertia cup rotor, Hall sensor, ball bearings
• Housing and cups of die-cast aluminium, coated, weatherproof
• RS485 with Modbus RTU, address adjustable from 0 to 255
• Supply 7 to 24 V DC

Application Examples:

• Weather stations and environmental measurement
• Agriculture, ports and traffic
• Measuring stations with data logging via Modbus
• Combination with the wind direction transmitter on the same RS485 bus

Documentation:

• DFRobot Wiki SEN0483
• Example program for Raspberry Pi on GitHub
• Dimension drawing (JPG)
• Guide: wind transmitters via RS485 to UART on Arduino and micro:bit (DFRobot Community)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0483
• Measuring range: 0 to 32.4 m/s
• Accuracy: ±0.3 m/s
• Start-up wind speed: 0.2 to 0.4 m/s
• Resolution: 0.1 m/s (register 0x0000, value ÷ 10)
• Supply: 7 to 24 V DC
• Interface: RS485, Modbus RTU
• Transmission: 9600 baud, 8 data bits, no parity, 1 stop bit
• Modbus address: 2 (factory default), adjustable from 0 to 255
• Wires: red +, black -, yellow RS485 A+, green RS485 B-
• Cable length: 2.5 m
• Dimensions: Ø 200 × 127 mm
• Weight: 620 g

Scope of Delivery:

• 1× RS485 wind speed transmitter
• 1× connection cable 2.5 m