LoRa RANLWE01 Rain Level Sensor Instructions

: June 3, 2024
: LoRa

Table of Contents

LoRa RANLWE01 Rain Level Sensor Instructions
Rain Level Sensor RANLWE01
Setup
Functions
General Information reg. metering of rain
Technical Data
__Downlink-Commands (using FPort 2):
Uplink-Commands (using FPort 2):
Configuration Parameters
- This parameter defines the heavy rain level as time interval (in
Support and Contact
Declaration of Conformity
Disposal Guidelines
Read More About This Manual & Download PDF:
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

LoRa RANLWE01 Rain Level Sensor Instructions

Rain Level Sensor RANLWE01

This rain sensor measures the amount of rain at the location of the sensor in ml within a 15 minute interval and transmits it via LoRaWAN. In case of heavy rain (more than 15 l/h), an alarm message is issued. The device is powered by two AAA batteries. The supplied high-quality VARTA, batteries allow a runtime of over 8 years.

Setup

Please register the device with its three keys with your LoRaWAN server before commissioning. You will find the Device EUI printed on the device. Enter this key on https://aqua-scope.com/lora to get the missing keys.
Open the sensor by turning the housing counterclockwise against the housing base. Now remove the communication module as shown in Figure 2.
After inserting the batteries, the LED next to the button flashes red/green (see Figure 1), indicating an active JOIN process. This is terminated with a successful JOIN on the network or after 20 seconds. The LED will indicate whether the JOIN process was successful by glowing red or green. If no network connection has been established, the device will switch to internal Aqua-Scope communication mode and can communicate directly with Aqua-Scope monitor devices even without a LoRaWAN network. The LoRaWAN JOIN process can be restarted using the button and a paper clip.
After plugging in the communication mode, you can simulate rain by moving the rocker and thus test whether and how such rain is reported by the sensor. Please note that the flat side of the communication module must be on the side of the water rocker.

Functions

Now place the sensor on a horizontal surface. A sight glass in the bottom of the housing will help with alignment.
When rain falls, the sensor will transmit the corresponding amount of rain every15 minutes. The minimum resolution of the sensor is 0.5 mm water column. Please note that this amount of rain
can only be measured exactly at the sensor. Already a few meters away from it, other rain amounts can occur. In case of heavy rain, a corresponding alarm is sent within approx. 2 minutes, which is deleted again when the rain intensity falls below the threshold. The threshold value for start rain can be defined in configuration parameter 3. It is preset at the factory to 15 liters/hour
If no rain is measured within a 15-minute interval, no radio transmission will take place to save the battery. The measuring interval can be freely defined via configuration parameter 1. Even without rain, the sensor will report regularly and transmit its uptime. By default, this wake-up interval is set to 6 hours and can be defined with configuration parameter 2.
In addition to the heavy rain alarm, the device sends an alarm when the battery is almost exhausted. In this case, however, you still have several months to replace the batteries.

General Information reg. metering of rain

Rain is measured either in mm water column above a point or as a quantity in liters on an area of 1 square meter. 1 liter/square meter corresponds to a water column of 1 mm. In the case of snowfall, this 1 mm water column corresponds to a snow depth of about 1 cm of snow.
Professional meteorological institutes use standardized rain gauges with an opening of at least 200 mm (specified in Chinese national standard GB/T 21978.2-2014 “Instrument for precipitation observation. Part 2: Tipping bucket rainfall sensor”). In contrast, this sensor has an aperture of only 130 mm, which allows sufficient measurement accuracy and still does not take up too much space.

Technical Data

Platform: STM32WLE5CCU6
LoRaWAN
- Frequency: EU868
- Join process: OTAA
- Class A
- Standard: LoRaWAN 0.3
- Range: > 10km (TX 22 dB).
range: -40 … 85 deg C
Water protection: IP 55
Dimension: 132x132x139 mm
packed: 140x140x150 mm
Weight: 219

Communication Protocol

Note: This description refers to the latest firmware in https://github.com/aqua-scope/lorain or firmwares 221001 and up. Your device in hand may have an older firmware with different settings.

__ The device can be controlled directly via LoRaWAN. For this purpose, different commands are defined, which are used either ‘uplink’, i.e. from the device to the LoRa network, or ‘downlink’,

i.e. from the LoRa network to the device. Commands can be cascaded up to the maximum number of 52 bytes. All values of the command descriptions are bytes, unless otherwise specified.

__Downlink-Commands (using FPort 2):

· 0x03 : Get hardware ID, device answers with uplink command 0x03

_0x04 PP VV_MSB VVLSB : Set configuration parameter PP for new 16 Bit value VV
· 0x1a : Get firmware version, device answers with uplink command 0x03a
0x14 PP : Get configuration parameter PP, device answers with uplink command 0x04

Uplink-Commands (using FPort 2):

_0x03 XX YY_MSB, YYLSB : Report hardware version XX and device capabilities bitmap YY
_0x04 PP VV_MSB VVLSB : Report 16 Bit Value VV of configuration parameter PP
_0x06 YY VV_MSB VVLSB : Report 16 Bit Sensor Value

· YY=0x01: Temperature in 0.1 degree Celsius. Please note, the temp sensor is based on uncalibrated NTC. Therefore it only gives a rough estimate of the temperature.

YY=0x03: Uptime in days

·YY=0x81: Rain level in measurement steps of 0,5 mm water level (example YY = 0x06 0x81 0x03 means 1.5 mm water or 1.5 l/m3).

_0x0a YY_MSB YY YY YYLSB : Report firmware version as 32 Bit value
_0x0b XX YY ZZ_MSB, ZZLSB : Report alarm state XX (1 or 0) of alarm type YY with optional value Current alarm types are
XX=0x03: sensor alarm (Z is seconds between two events: 0.5 mm within Z s.),
XX=0x0c: battery alarm
_0x12 XX YY_MSB, YYLSB : Battery status, XX = voltage in 100 mV, YY Consumption since reboot in mAh

Configuration Parameters

Parameter 2 – Heartbeat Interval

This parameter defines after how many measurement intervals the sensor will send a report regardless of rainfall. The factory default is 24 which translates together with the default value of parameter #1 (900 seconds = 15 minutes) into 24 * 15 minutes = 6 hours. __

Parameter 3 – Heavy Rain Threshold

This parameter defines the heavy rain level as time interval (in

seconds) for 0.5 mm rain. The default value of 120 means that 0.5 in 120 seconds or less will cause heavy rain alarm. This translates into 15 liter/h.

Parameter 4 – Measurement Interval in Seconds

In case of rain the device reports regularly to the LORA network. This parameter defines the time interval for these reports in sec. The default is 900 = 15 minutes. The value range is 10 – 60000.

Parameter 5 – Calibration of Temperature Sensor

This parameter allows a linear correction of the reported temperature value. The default value is 100.

Support and Contact

Should you encounter any problem, please give us an opportunity to address it before returning this product. Please check our website www.aqua-scope.com and particularly the support section for answers and help. You can also send a message to info@aqua-scope.com
While the information in this manual has been compiled with great care, it may not be deemed an assurance of product characteristics. Aqua-Scope shall be liable only to the degree specified in the terms of sale and delivery. The reproduction and distribution of the documentation and software supplied with this product and the use of its contents is subject to written authorization from Aqua-Scope. We reserve the right to make any alterations that arise as the result of technical development.

Phone: +372 (0) 624 8002
Mail: support@aqua-scope.com
Web: www.aqua-scope.com

Declaration of Conformity

Aqua-Scope Technology OÜ, Sakala 7-2, 10141 Tallinn, Republic of Estonia, The radio emitting device
works on frequency 868…869 MHz with output power of 22 dBm. (158 mW)

Disposal Guidelines

Do not dispose of electrical appliances as unsorted municipal waste, use separate collection facilities. Contact your local government for information regarding the collection systems available. If electrical appliances are disposed of in landfills or dumps, hazardous substances can leak into the groundwater and get into the food chain, damaging health and well-being