A dendrometer is an instrument used to measure diameter changes of trees and fruit. Small micrometer changes in diameter occur in trees and fruit throughout the day as part of healthy water transport processes. Comparisons of these daily diameter changes can help predict the onset and occurrence of water stress. Diameter measurements collected over weeks and months show the rate and magnitude of plant growth. In particular, weekly diameter growth data can be analyzed to understand if fruit growth rate is tracking well for harvest.
The OpenDendrometer is a low-cost digital dendrometer with wireless data transfer capabilities. In simplest terms, it is device that measures, logs, and wirelessly reports changes in linear displacement. It uses commonly available electronics components and fabrication techniques to ensure that others can easily build their own OpenDendrometer. All design files and information are shared freely.