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RANWIE01 -- Rain Gauge (WLAN)

RANWIE01 Rain Gauge

Product Description​

This rain sensor measures the amount of rainfall at the sensor location in millimeters of water column using a tipping bucket mechanism and transmits the quantity within a configurable interval (default: 15 minutes) with an accuracy of 0.5 mm water column. In addition, the temperature is transmitted.

The measurement data is sent via WLAN to the Aqua-Scope Cloud, via MQTT, or as JSON to smart home gateways. The sensor is powered by two AAA batteries (approx. 2 years battery life). In the event of heavy rain exceeding 20 liters/hour, an alarm is triggered. Both the heavy rain threshold and the measurement interval are configurable.

Key Features:

  • Tipping bucket principle, 0.5 mm resolution
  • Heavy rain alarm at > 20 l/h (threshold configurable)
  • Configurable measurement interval (default: 15 min.)
  • WLAN + App / MQTT / JSON Webhook
  • Power supply: 2 x AAA batteries (approx. 2 years battery life, VARTA included)
  • Low battery warning via radio
  • Protection rating: IP55

Setup and Installation​

Installation and Electronics Block
  1. Open the cover by turning it counterclockwise.
  2. Remove the electronics block -- held in place on both sides by small clips.
  3. Inside the electronics block you will find: battery compartment, single button, red/green LED next to the button.
  4. Insert batteries (2 x AAA).
  5. Choose a suitable location:
    • Clear view of the sky
    • No obstacles that could affect precipitation measurement
    • Sufficient WLAN coverage (test with your mobile phone)
  6. Mount the sensor securely on an elevated surface (mast or wall).
  7. Level the sensor horizontally -- use the spirit level in the base (viewing glass) for verification.
  8. Secure with the 3 included screws and wall plugs (prevents wind damage).
Location Selection

The device should be placed at an open location without obstacles that could affect the precipitation measurement. Ensure that sufficient WLAN coverage is available at the chosen location.

Horizontal Alignment

Incorrect alignment will lead to inaccurate or missing measurement values. Use the built-in spirit level in the base.

Connection and Communication​

The WLAN setup is performed via the device's configuration page (SSID "Scope"). A detailed step-by-step guide can be found at WLAN Connection.

Factory Reset: Press and hold the button for 4 seconds while inserting the batteries. The red LED blinks four times (as a counting aid). Release when the LED flashes red three times.

Connection Process (4 Steps):

  1. The device creates a WLAN network with the name "Scope" (no password required)
  2. Connect to this network via smartphone or PC
  3. Open a browser: http://scope.local or http://192.168.4.1
  4. Available WLAN networks are displayed -- enter the WLAN password and email address, then you will be redirected to the Aqua-Scope app at https://app.aqua-scope.com

For Advanced Users​

In addition to the Aqua-Scope app, further communication options are available and can be activated via Configuration -> Communication Options in the app:

info

The local web server and Modbus IP are only available in mains-powered mode, not in battery mode.

Sensor Data​

App View Rain Gauge

The sensor measures rainfall in millimeters of water column in a 15-minute interval.

Transmission Behavior:

  • Rain detected: Measurement is sent immediately via WLAN
  • No rain: Status report only every 6 hours (rain=0 + additional data)
  • Heavy rain alarm: At > 20 l/h, an alarm message is sent immediately
  • All clear: When precipitation falls below the heavy rain threshold, this is also reported

MQTT/JSON Format:

{
  "uptime": "1",
  "temperature": "200",
  "rainlevel": "0",
  "battery": "100",
  "raintotal": "5"
}

Data Fields:

FieldDescription
uptimeHours since last battery change
temperatureTemperature in 1/10 degrees Celsius
rainlevelMeasured rainfall in the last interval (mm water column)
batteryConsumed battery capacity since last change (mAs)
raintotalTotal measured rainfall since last battery change (mm water column)

Configurable Parameters:

ParameterDescriptionDefault
29Measurement interval in seconds. Sends status only if ≥ 0.5 mm rain detected.900 (= 15 min.)
27Zero-report multiplier. Sensor sends zero report after x × measurement interval.24 (= 6 hours)

Local Operation​

The electronics capsule contains: two batteries, an opening with a button, and two LEDs next to the button. The button is operated with a matchstick, needle, paper clip, or small screwdriver.

LED Signals​

SignalMeaning
Red/green blinkingFactory state -- own WLAN "Scope" active
Red blinking (4x) during battery insertionCounting aid for factory reset (hold for 4 sec.)
Three red flashesFactory reset completed
Brief LED flashWaking from deep sleep

Button Functions​

ActionFunction
Hold 4--5 sec. (during battery insertion)Factory reset -- WLAN settings cleared, parameters reset
Press 1--2 sec.Wake from deep sleep + send status report (when WLAN is connected)

Scope of Delivery​

  • Rain gauge (main unit)
  • 3 x mounting screws + wall plugs
  • 2 x AAA batteries (VARTA)

Technical Specifications​

ParameterValue
SKURANWIE01
Processor (main)ESP32-WROOM_32E (Xtensa Dual Core 32 Bit, 240 MHz, 520 KB RAM)
Co-processorXtensa 16 Bit Ultra Low Power RISC
WLAN2.4 GHz, IEEE 802.11 b/g/n
Rain resolution0.5 mm or 0.5 l/m3
Measurement period15 minutes
Temperature accuracy+/- 3 °C
Temperature range-25 °C to +50 °C
Status reportEvery 6 hours (when no rain)
Heavy rain alarmFrom 15 l/h
Controls3-color LED, single button
Batteries2 x AAA, 2.2--3.6 V
Protection ratingIP55
Operating temperature-20 °C to +50 °C
Storage/transport temperature-65 °C to +125 °C
Relative humidity0--90 %
Dimensions (device)132 x 132 x 139 mm
Dimensions (packaging)140 x 140 x 150 mm
Weight219 g
Radio emissions (WLAN)2.4 GHz broadband (EN 300 328)

Further Information​