How We Measure
AuraPlant combines capacitive soil moisture sensing with computer vision analysis to build a complete picture of your plant's health. Below are the measurement ranges, what they mean, and how to interpret the data on your dashboard.
Soil Moisture
Moisture Levels Explained
Our capacitive sensor outputs a voltage between 1.60 V (wet) and 2.31 V (dry). The system converts this to a 0–100 % scale through linear calibration.
Critical Dry
0 – 15 %
8 %
2.30 V
The soil has almost no available water. Leaves may be wilting, curling, or developing brown crispy edges. Immediate watering is required to prevent irreversible damage.
Dry
15 – 35 %
25 %
2.15 V
Soil moisture is below the comfort zone for most houseplants. The plant is not in immediate danger but should be watered soon. Leaves may appear slightly droopy in the afternoon.
Optimal
35 – 65 %
52 %
1.95 V
The ideal moisture range for most tropical houseplants. The soil feels damp but not soggy. Roots have access to both water and oxygen. No action needed.
Wet
65 – 100 %
85 %
1.65 V
The soil is heavily saturated. For most plants this is acceptable short-term after watering, but prolonged saturation can lead to root rot. Allow the soil to dry before the next watering cycle.
Visual Analysis
Plant Health by Sight
Every photo is analysed in HSV colour space to calculate the green pixel ratio — the percentage of the image covered by healthy green foliage.
Healthy Growth
Dense green canopy with consistent coverage. The green pixel ratio is high and stable, indicating the plant is photosynthesizing efficiently and producing new foliage.
Early Stress
The green ratio has dropped noticeably. Some leaves may be showing chlorosis (yellowing) at the edges. This often indicates underwatering, nutrient deficiency, or insufficient light.
Wilting / Drought
Significant canopy loss detected. Many leaves have turned brown or fallen. The plant is under severe stress. Immediate intervention is needed — check soil moisture, light levels, and root health.
Recovery
After corrective action the green ratio is trending upward. New shoots and fresh leaves are appearing. Continue current care routine and monitor weekly for sustained improvement.
Data Correlation
Moisture vs. Growth
This simulated 30-day chart shows how soil moisture and green canopy coverage correlate. Consistent watering leads to stable, healthy growth.