Introduction
This page shows the data of the dendrometer in real time. the sensor is connected to a vineyard of Ruinart and will be sending measurements back from the sensor to monitor its growth and to use in a data driven artwork of Thijs Biersteker.
Whats a Dendrometer ?
A dendrometer is a scientific instrument used to measure the growth or changes in size of living trees or plants. It captures the subtle swelling and shrinking of a tree's stem diameter, providing real-time data about the plant's health, growth rate, and response to environmental conditions.
at the end of this page are notes on the working and reading of the dendrometer.
How to read the data?
Dendrometer data, typically presented as time-series graphs, shows variations in a plant's stem diameter over time. By analyzing these patterns, one can interpret plant responses to environmental conditions. Increase in stem size suggests growth, while fluctuations can indicate water uptake, loss, or stress responses to weather changes.
Why a Dendrometer :
Thijs Biersteker's art synthesizes technology and ecology, much like how a dendrometer interprets a tree's life. His installations echo the dendrometer's role, capturing nature's subtle signals and transforming them into an immersive, tangible experience. This reflects a shared goal: to foster a deeper connection and respect for our environment.
Dendrometer connected at the Ruinart Vineyard.
( #2803 decent lab)
Past 2 Days (two days shows the day and night rhythm clearly )
Past 14 days
Past 7 days
Past 1 Year
Past 6 months
ABOUT THE DENDROMETER
LoRaWAN® -enabled O- t dendrometer. Measures swelling and shrinkage of stems, branches or roots with a sub-micrometer resolution. Carbon fiber (CFK) frame combined with stainless steel elements for superior long-term and temperature stability. Measurement range: 20000 µm = 20 mm. Compatible with LoRaWAN® networks of any provider. Place and measure: no setup required. Configurable via command line interface and downlink command interface. Unattended real-time monitoring for several years without replacing batteries. Robust polycarbonate enclosure: weatherproof, impact-, UV-resistant (IP67). Standard alkaline (C-type) batteries. CE compliant, Radio Equipment Directive (RED) 2014/53/EU.
DEVICE LOGGING FUNCTION Sampling interval 10 min (configurable through the user interfaces) Data upload interval 10 min (configurable through the user interfaces) Reported sensor data (average of samples) Dendrometer A position Dendrometer B position (dual dendrometer variant only) Battery voltage
DENDROMETER POSITION Operating principle Displacement transducer: linear potentiometer Measurement range 0 … 20000 µm Resolution 0.003 µm (23 bit) RADIO / WIRELESS Wireless technology LoRaWAN® Wireless security AES-128 data encryption LoRaWAN® device type Class A end-device Supported LoRaWAN® features OTAA, ABP, ADR, adaptive channel setup Wireless range > 10 km (line of sight1 ), approx. 2 km (suburban) RF transmit power 14 dBm (25 mW) Effective radiated power 11.9 dBm maximum2 Receiver sensitivity -146 dBm 3 Frequency bands 868 MHz (EU version), 915 MHz (US, AS, AU versions)4 Antenna Integrated omnidirec
OPERATING CONDITIONS
Temperature -20 ... 50 °C Humidity 0 ... 100 % RH MECHANICAL SPECIFICATIONS Dendrometer dimensions 190 × 92 × 8 mm (T-shaped dendrometer plate) Dendrometer weight 200 g approx. Cable length 1 m Sensor device dimensions 135 × 81 × 70 mm (not including sensor / cable) Sensor device weight 400 g including batteries (270 g without batteries) Sensor device material, IP rating Polycarbonate; weatherproof, impact-, UV-resistant (IP66/IP67). Pressure equalizer plug with PTFE membrane (IP68).
Download technical specifications : https://cdn.decentlab.com/download/datasheets/Decentlab-DL-ZN-datasheet.pdf
INSTALLING THE DENDROMETER:
Mounting instruction 1. Dismantle the two screws on one side of the frame. 2. Enclose the stem, branch or root section with the frame and torque the two screws of the frame. 3. Clear the spot on the bark on which the sensor head is placed from rough, dead parts of bark. Use a knife, a chisel or sandpaper but never cut into the living part of the bark. 4. Adjust the distance between the potentiometer and the stem. Place the sensing rod on the bark. Ensure that the sensing rod is pointing towards the centre of the stem. 5. Place the three screws tightly on the bark surface (no drill wholes necessary). Make sure the frame is not moving anymore after fixing the screws. 6. Connect the brown wire to a stabilised +5V DC power supply, the yellow (and green) wire to GND, and the white wire to the data logger. Maintenance Put a droplet of WD-40 on the moveable sen
Please see technical sheet http://www.natkon.ch/pdf_files/Tech_Produkte/DatasheetZN11-O-WP.pdf
CONNECTING TO THE NETWORK
Sensor data are transmitted in real-time using LoRaWAN® radio technology. LoRaWAN® enables encrypted radio transmissions over long distances while consuming very little power. The user obtains sensor data through Decentlab’s data storage and visualization system seen on this page, later we can embed this in the user's own infrastructure.
LoRaWAN (Low Range Wide Area Network) is a type of wireless communication specifically designed for long-range, low-power applications, making it ideal for agricultural and environmental monitoring. With its ability to transmit data over several kilometers, it can easily cover large farm lands and remote vineyards. By connecting sensors like dendrometers to the LoRa network, farmers and viticulturists can continually monitor crop growth and environmental conditions, receiving real-time data without the need for regular manual checks. Its robustness, power efficiency, and wide coverage make LoRaWAN a probable presence in many agricultural and viticultural sites, including possibly the location in question.
REPLACING THE BATTERY
Replacing the battery in a Decent Lab sensor requires a few straightforward steps.1. Ensure the device is off and safe to handle.2. Locate the battery compartment, usually found at the back or the underside of the device. 3. Depending on the sensor design, you might need a screwdriver to open the compartment. 4. Remove the old battery, taking note of the battery orientation. 5.Insert the new battery, matching the polarity of the old one. 6 Close the battery compartment and secure it. 7. Turn on the sensor to confirm the new battery is functioning correctly.
Remember, always recycle used batteries properly, as they contain harmful materials that should not be disposed of in regular trash.
Check below of the battery is low
( the data below is real time )
POWER SUPPLY Internal battery type
2 × alkaline C batteries (LR14) Power consumption (average) ≤ 0.5 mW (10 min interval) Battery lifetime estimation5 9.3 years (10 min interval, SF7) 4.4 years (10 min interval, SF12) 15.8 years (60 min interval, SF7) 12.1 years (60 min interval, SF12)
