Ultrasonic 7-in-1 RS485 Weather Station Sensor for Arduino

The ultrasonic 7-in-1 weather station from DFRobot measures wind speed, wind direction, temperature, humidity, air pressure, light intensity and rainfall in one device. Wind is measured with four ultrasonic probes without moving parts, which saves maintenance and on-site calibration. The UV-resistant ABS housing is protected to IP54. The values come via RS485 with Modbus-RTU, the supply is 10 to 30 V DC; there is an Arduino example from DFRobot.

Recommended Accessories:

• DFRobot RS485-to-UART Module with Active Isolation
• USB to RS485 Converter Module
• Universal plug-in power supply 3–12V DC 1000mA
• DC Socket Female Barrel Jack 5.5mm / 2.1mm with Screw Terminals

Features:

• Wind 0 to 40 m/s (start 0.5 m/s), ±(0.5 m/s + 2 % FS); direction 0 to 359°, ±3°
• Temperature -40 to 80 °C, ±0.5 °C; humidity 0 to 99 % RH, ±3 % RH
• Air pressure 0 to 120 kPa, ±0.15 kPa; light 0 to 200000 lux, ±7 %
• Optical tipping bucket rain gauge on top, resolution 0.1 mm, ±4 %, up to 4 mm/min
• RS485 with Modbus-RTU, factory address 1, 4800 baud (1200 to 115200 baud selectable)
• Polling interval and waiting time at least 200 ms each; use a 120 Ω termination on long lines (DFRobot FAQ)
• Cable: brown VCC (10 to 30 V), black GND, yellow RS485-A, blue RS485-B
• Clean the lower measuring surface of dust regularly (DFRobot)

Application Examples:

• Weather station for garden, roof or school
• Ventilation and irrigation in the greenhouse based on weather data
• Measuring point with LoRaWAN node or PLC
• Measuring rainfall and pausing irrigation

Documentation:

• Wiki DFRobot SEN0657
• Arduino example (DFRobot Wiki)
• Modbus registers and settings (DFRobot Wiki)
• Dimension drawing

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0657
• Supply: 10 to 30 V DC
• Current consumption: below 10 mA
• Interface: RS485, Modbus-RTU, address 1, 4800 baud factory setting
• Wind speed: 0 to 40 m/s, ±(0.5 + 2 % FS), response time 1 s
• Wind direction: 0 to 359°, ±3°, response time 1 s
• Temperature: -40 to 80 °C, ±0.5 °C
• Humidity: 0 to 99 % RH, ±3 % RH
• Air pressure: 0 to 120 kPa, ±0.15 kPa, response time 2 s
• Light intensity: 0 to 200000 lux, ±7 %, response time 2 s
• Rainfall: up to 4 mm/min, resolution 0.1 mm, ±4 %
• Long-term stability: humidity ≤1 %/year, temperature ≤0.1 °C/year, light ≤5 %/year
• Protection class: IP54
• Housing: ABS, UV-resistant
• Cable: 14 cm on the sensor, adapter cable 150 cm
• Dimensions: 344 × 93 × 93 mm
• Weight: 916 g

Scope of Delivery:

• 1× ultrasonic weather station 7-in-1 RS485
• 1× adapter cable 150 cm