RS485 Wind Direction Measuring Device

The DFRobot wind direction transmitter (wind vane) measures the horizontal wind direction with a Hall sensor and outputs it via RS485 with Modbus RTU. Housing and vane are made of die-cast aluminium, the electronics are protected against weather, and the cable connection is a corrosion-resistant circular connector. The current version V2 delivers the direction as an angle from 0 to 360° in steps of 0.1° and additionally as one of 16 compass directions. The older version delivers only the 16 directions.

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:

• Wind direction 0 to 360° (V2, resolution 0.1°) and 16 compass directions
• Start-up wind speed max. 0.3 m/s
• Low-inertia wind vane, Hall sensor
• Housing and vane of die-cast aluminium, weatherproof
• RS485 with Modbus RTU, address adjustable from 0 to 255
• Supply 7 to 24 V DC
• Arduino library for V2 on GitHub

Application Examples:

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

Documentation:

• DFRobot Wiki SEN0482
• Arduino library V2 on GitHub
• Guide: wind transmitters via RS485 to UART on Arduino and micro:bit (DFRobot Community)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0482
• Measuring range: 0 to 360° (V2) and 16 directions
• Resolution: 0.1° (V2, register 0x0000), 16 directions in register 0x0001
• Start-up wind speed: max. 0.3 m/s
• 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
• Mounting: align the mark on the sensor to the north (DFRobot Wiki)
• Dimensions: Ø 235 × 167 mm
• Weight: 560 g

Scope of Delivery:

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