Fruit dendrometer
Dendrometer for measuring fruit growth
- Attaches to the plant in seconds
- Léger et n’endommage pas le fruit ou le tronc
- Wind- and rain-resistant installation
- Dimensions to suit different fruit and trunk sizes
- Stable, adjustment-free operation
- Real-time measurement of fruit and trunk growth
- Swiss design and manufacture

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. Plusieurs dendromètres ainsi que d’autres capteurs peuvent être combinés sur le même bus et partager un seul émetteur-récepteur radio pour transférer les données à des fins de surveillance et d’analyse. Le dendromètre comporte deux catégories de registres I2C:
- 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 | température de l’octet high byte 0,1℃/LSB | R |
0x06 | START_MEAS | write 1 to start measurement. always 0 if reading | R/W |
0x7F | ENABLE_MODE_CONFIG | lorsqu’il est activé, toutes les adresses peuvent être écrites | W |
Flash:
Address | Name | Description | Reading/Writing |
0x8A | CALIBRATION_OFFSET_L | 0.01 mm/LSB diameter low byte offset | R |
0x8B | CALIBRATION_OFFSET_H | décalage de l’octet high sur le diamètre 0,01 mm/LSB | R |
0x8C | TEMPERATURE_OFFSET_L | décalage de l’octet de low byte sur la température 0.1℃/LSB | R |
0x8D | TEMPERATURE_OFFSET_H | décalage de l’octet high byte sur la température 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 | Saturation haute de l’octet basse du diamètre 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