Bionutrient Meter: Some technicals

Key Features

  • 10 wavelength reflectometer output not affected by ambient light - robust and field-ready
  • Connects to Real Food Campaign app to collect, share, and display results.
  • Includes 3 starter experiments and tutorial to create your own
  • Connects to any Android device wirelessly using Bluetooth or wired using USB On The Go.
  • Includes wall charger and internal 3400 mAh battery.
  • Fully open source and hackable.

Applications

Designed for use with:

  • liquids in 5ml or 0.7ml square cuvettes
  • liquid colormetric measurements (example: pH change)
  • cell density (940nm)
  • examples: milk fat concentration, spectral properties of juices, wines, etc.
  • soil or other bulk soil
  • soil carbon estimation (requires calibration)
  • soil color estimation
  • solids objects (fruits, veggies)
  • spectral signatures for nutrient estimation (requires calibration)
  • leaves or other flat objects
  • NDVI (greenness) in leaves
  • Relative carotenoids, anthocyanins, or other color-related compounds.

Default Output

  • Reflectance at all wavelengths (normalized from 0 - 100)
  • Chlorophyll fluoresence and any fluorescence with excitation <700nm and fluorescence >700
  • NDVI (greenness) in leaves

Sensor Detail

Reflectance hardware

  • 10 Wavelengths (nm): UVB - 365; Visible - 385, 450, 500, 530, 587, 632; Far Red / NIR - 850, 880, 940
  • 2 Detectors (nm range): 300 - 700, 700 - 1100

Additional sensors

  • Temperature (full range: -40 - 85C, accuracy within 0 - 65C: +-1C)
  • Relative Humidity (range: 0 - 100%, accuracy: +-3%)
  • Pressure (range: 300 - 1100 hPa, accuracy: +-0.25%)
  • VOCs (range: 0 - 500 IAQs, accuracy: +-15%)
  • Audio jack for additional inputs/outputs. Examples include soil sensor, moisture sensor, etc.

Case

  • 13.9 x 5.2 x 4.6cm
  • 3D printed from PETG
  • Temperature resistant up to 60C

Calibration

All instruments come individually calibrated to reduce instrument to instrument variation, variation by time and by temperature.

For long-term shifts in signal intensity, users may easily recalibrate, or calibrate several machines to the same standard.