Sensor Node
Sensor connector: up to 4 instrumentsSensor Node
The Sensor Node is the module that connects your various sensors for intelligent agriculture.
Fruit dendrometers
Measuring the growth of your fruitFruit dendrometers
Dendrometers with temperature and growth measurement.
Trunk dendrometer
Measure the growth of your fruit treesTrunk Dedrometer
Trunk dendrometer, measures temperature and circumference.
Dendro 400
Measures the long-term growth of your treesDendro 400
Trunk dendrometer, measures temperature and circumference up to 400mm of growth.
Extenso 500
Measures linear displacement by cableExtenso 500
Extensometer, temperature measurement and fault evolution
Sensor Node
Connection module for smart farming sensors
- Le Sensor Node Allows connecting 1 to 4 devices simultaneously.
- Relay between your sensors and the LoRa gateway.
- Battery power allowing up to 2 years of autonomy without recharging
- Weatherproof : Designed to withstand harsh weather conditions.
- Discretion assured: Blends into the landscape to avoid the risk of theft.
- Swiss design and manufacture
Technical data
Specific data - Model S (small fruit)
| Measurement range | 9 mm to 42 mm |
| Overall dimensions | Ø 70 mm × h : 100 mm |
| Weight | 50 g |
Specific data - Model M (medium fruit)
| Measurement range | 19 mm to 90 mm |
| Overall dimensions | Ø 70 mm × h : 150 mm |
| Weight | 55 g |
General data - S and M models
| Sampling | 1 measurement every 15 minutes |
| Materials | Carbon fibre |
| Operating temperature | -20 °C to 60 °C |
Measurement characteristics - Diameter
| Precision | ± 0.05 mm |
| Resolution | 0.01 mm |
Measurement characteristics - Temperature
| Precision | ± 0,05 °C |
| Resolution | 0,01 °C |
| Measurement range | -20 °C to 60 °C |
Fruit dendrometer
Dendrometer for measuring fruit growth
- Le dendrometer is used to measure changes in fruit diameter over the season.
- 2 models available in S and M sizes to suit different fruit sizes.
- Fitted in a matter of seconds.
- Fruit protection : Optimised attachment pressure to avoid damaging the fruit.
- Weatherproof : Designed to withstand harsh weather conditions.
- Discretion assured: Blends into the landscape to avoid the risk of theft.
- Swiss design and manufacture
Technical data
Specific data - Model S (small fruit)
| Measurement range | 9 mm to 42 mm |
| Overall dimensions | Ø 70 mm × h : 100 mm |
| Weight | 50 g |
Specific data - Model M (medium fruit)
| Measurement range | 19 mm to 90 mm |
| Overall dimensions | Ø 70 mm × h : 150 mm |
| Weight | 55 g |
General data - S and M models
| Sampling | 1 measurement every 15 minutes |
| Materials | Carbon fibre |
| Operating temperature | -20 °C to 60 °C |
Measurement characteristics - Diameter
| Precision | ± 0.05 mm |
| Resolution | 0.01 mm |
Measurement characteristics - Temperature
| Precision | ± 0,05 °C |
| Resolution | 0,01 °C |
| Measurement range | -20 °C to 60 °C |
Trunk dendrometer
Dendrometer for measuring daily changes in trunk circumference
- Designed for trunks from 3 to 15 cm in diameter, such as fruit trees and other small trees.
- To be installed during the active vegetation period in order to accurately monitor growth.
- Automatic data recording every 15 minutes, accurate to one hundredth of a millimetre.
- Quick installation in less than a minute. Compact, discreet and weatherproof.
- Connection to the sensor node by cable, with data transmitted to the server via a LoRa gateway.
- Swiss design and manufacture
Technical data
General information
| Sensor | Dendrometer |
| Dimensions | 100 × 12 × 12 mm |
| Weight | 60 g |
| Materials | Aluminium |
| Protection class | IP66 |
| Operating temperature | -40 °C to 60 °C |
Sensor data - Diameter
| Sampling | 1 measurement every 15 minutes |
| Measurement range | 20 mm in circumference |
| Precision | ± 0.05 mm |
| Resolution | 0.01 mm |
Sensor data - Temperature
| Sampling | 1 measurement every 15 minutes |
| Measurement range | -20 °C to 60 °C |
| Precision | ± 0,3 °C |
| Resolution | 0,1 °C |
Dendro 400
Dendrometer for measuring long-term tree growth
- Monitoring the radial growth of large trees
- Monitoring forest dynamics over time
- Measurement of trunk expansion up to 400 mm
- Record temperature variations using the built-in sensor
- Resistant to harsh weather conditions thanks to a robust design
- Remote access to your data via LoRa connectivity
- Swiss design and manufacture
Technical data
General information
| Sensor | Dendrometer |
| Dimensions | 20 × 20 × 260 mm |
| Use | External in a natural environment over several years |
| Operating temperature | -40 °C to 60 °C |
Sensor data - Circumference
| Sampling | 1 measurement per day |
| Measurement range | 400 mm maximum extension |
| Resolution | 0.05 mm |
Sensor data - Temperature
| Sampling | 1 measurement per day |
| Measurement range | -20 °C to 60 °C |
| Precision | ± 0,3 °C |
| Resolution | 0,1 °C |
Extenso 500
Dendrometer for measuring linear displacements by cable, various possible uses.
- Monitoring the stability of rock faces
- Monitoring the deformation of civil engineering structures
- Spacing measurements up to 500 mm
- Integrated temperature sensor
- Weather resistant
- Data transmission via Lora
- Swiss design and manufacture
Technical data
General information
| Sensor | Dendrometer |
| Dimensions | 25 × 27 × 250 mm |
| Materials | Aluminium, Stainless steel |
| Use | External in a natural environment over several years |
| Operating temperature | -40 °C to 60 °C |
Sensor data - Diameter
| Sampling | 1 measurement every 15 minutes |
| Measurement range | 250 to 1000 mm extension |
| Precision | ± 50 µm |
| Resolution | 0.01 mm |
Sensor data - Temperature
| Sampling | 1 measurement every 15 minutes |
| Measurement range | -20 °C to 60 °C |
| Precision | ± 0,3 °C |
| Resolution | 0,1 °C |
Applications
Orchards
Measuring the climate to optimise irrigation
Greenhouses
Measuring the microclimate in greenhouses
Crop research
Maintaining optimum germination conditions
Harvest forecast
Determining whether crops are ready for harvesting
Improving performance
Measuring crop stress and ensuring regular growth to prevent skin damage
Technical data
Measures
The fruit dendrometer measures the following elements:
- Diameter
- Temperature
Data is transferred via a bus interface I2C. Several dendrometers and other sensors can be combined on the same bus and share a single radio transceiver to transfer data for monitoring and analysis. The dendrometer has two categories of registers
- Ram registers: values that change frequently and are not saved after a reset.
- Flash registers: configuration values saved after a reset.
Writing and reading in registers
Configuration registers are read-only by default. ENABLE_MODE_CONFIG must be set to enable write mode.
Package format
Register mapping
Ram :
| Address | Name | Description | Reading/Writing |
| 0x00 | EXIT_DIAMETER_L | low byte diameter 0.01 mm/LSB | R |
| 0x01 | EXIT_DIAMETER_H | high byte diameter 0.01 mm/LSB | R |
| 0x02 | TEMPERATURE_OUTPUT_L | low byte diameter 0.1℃/LSB | R |
| 0x03 | TEMPERATURE_OUTPUT_H | high byte temperature 0.1℃/LSB | R |
| 0x06 | START_MEAS | write 1 to start measurement. always 0 if reading | R/W |
| 0x7F | ENABLE_MODE_CONFIG | when enabled, all addresses can be written to | W |
Flash:
| Address | Name | Description | Reading/Writing |
| 0x8A | CALIBRATION_OFFSET_L | 0.01 mm/LSB diameter low byte offset | R |
| 0x8B | CALIBRATION_OFFSET_H | high byte offset on diameter 0.01 mm/LSB | R |
| 0x8C | TEMPERATURE_OFFSET_L | temperature low byte offset 0.1℃/LSB | R |
| 0x8D | TEMPERATURE_OFFSET_H | temperature high byte offset 0.1℃/LSB | R |
| 0x8E | DIAMETER_LIMIT_LOW_L | low byte low saturation of diameter 0.01 mm/LSB | R/W |
| 0x8F | DIAMETER_LIMIT_LOW_H | High saturation of the low byte of the diameter 0.01 mm/LSB | R/W |
| 0x90 | DIAMETER_LIMIT_HIGH_L | low byte high saturation of diameter 0.01 mm/LSB | R/W |
| 0x91 | DIAMETER_LIMIT_HIGH_H | high byte high diameter saturation 0.01 mm/LSB | R/W |
The fruit dendrometer includes
- Spring arm with integrated sensors and signal conditioning
- Shielded cable
- 4-pole waterproof connector (for connection to our transceiver unit or to a bus extender)
Measures
| Temperature | Diameter | |
| Measurement units | Degrees Celsius | mm |
| Resolution | 0.1°C | 0.01 mm |
| Precision | +- 0.3°C | +-0.05 mm |
| Measurement range | 0°C to 65°C | 19mm to 90mm |
Sourcing
- 3.3V
- 7.4 mA (operating)
Initial configuration
All dendrometers are supplied with a default I2C address. To combine several dendrometers on the same bus, each must be reprogrammed with a unique I2C address; this configuration can be carried out when the order is placed or programmed on site before deployment.
Taking measurements
To make a measurement
- Write 1 to the START_MEAS register
- Wait 50 ms for the measurement to be taken
- Read the measurement (diameter, temperature) from the output register
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