Spectral sensing plays a crucial role in agriculture and environmental monitoring by providing non-destructive insights into chemical composition and physiological status of plants. Old farmers have an eye for it, but the latest generation of farmers are using spectral sensing to add just the right adjustments to fertigation to get the highest yield with least costly input. Unfortunately, proprietary spectrometers are often expensive and lack modularity, which limits their adoption in agriculture (particularly small family farms), educational, research and field applications. A new study has solved this problem by developing an open-source spectral measurement platform. It addresses this gap by offering a low-cost, customizable solution for reflectance analysis in plant leaves and diverse materials.

Open Source Spectrometer for Leaf Color for Farmers

The open-source spectrometer system integrates a Hamamatsu C12880MA miniature spectrometer with dual illumination: a white LED and a 3 mm incandescent bulb, covering 340–850 nm. Control and acquisition are managed by a Teensy 3.2 microcontroller through a Python interface that enables calibration and data storage. The modular enclosure, fabricated via an open-source RepRap-class fused filament-based 3D printing and PVC components, ensures flexibility and reproducibility. With 3D printing you can even customize the form of the tool to integrate into your own equipment. This device although high-tech can be put together by a knowledgeable high-school student. Full source files are available.

Open Source Spectrometer for Leaf Color – Goo

To determine if the new technology is good enough for farmers a series of validation tests were run. Validation tests demonstrated accurate wavelength alignment when exposed to laser sources, with peaks detected at 407 nm and 663 nm, and truly miniscule mean squared errors of 0.0131 and 0.0208, respectively. Ambient light comparisons with a commercial spectrometer yielded strong agreement. Reflectance measurements using a ColorChecker Classic confirmed consistency in 340–850 nm, validating the suitability of the device for plant reflectance analysis and material identification on farms as well as both scientific research and educational settings. This spectrometer once again shows how the open source approach drops economics cost . The open source spectrometer can be built for less than $500 and offsets the purchase of other devices on the market that start at $1600. This again demonstrates a high ROI for developing open source hardware .