Nanobot Crop Guardian Field Map (2D)

Swarm Controls

Bot count 60

Chemotaxis strength χ 0.70

Payload capacity (doses) 3

Bot speed 3.2 m/s

Capture radius 0.55 m

Biomarker diffusion rate D 0.80

Biomarker decay rate k 0.120

Field Status

Infected remaining

Treated (total)

Bots dosing now

Sim time

0.0 s

Legend

Healthy plant

Infected plant (emits biomarker)

Treated plant

Nanobot — searching

Nanobot — dosing

Nanobot — returning to depot

How it works

Infected plants continuously leak a disease biomarker (a volatile organic compound / stress metabolite). It spreads across the field top-down, following Fick's second law with decay:

∂C/∂t = D·∇²C − k·C + S(x,t)

D — diffusion rate (slider)
k — decay rate (slider)
S — source term, active at each infected plant

The field is solved on a 40×40 grid with an explicit finite-difference (FTCS) stencil each fixed sub-step, clamped to a stable time-step so it stays accurate at every diffusion rate on the slider.

Each nanobot behaves like a chemotactic bacterium: it samples the local gradient ∇C at its position (central difference on the grid) and biases its heading toward it, blended with a random-walk "tumble" component:

v = normalize( χ·∇C + (1−χ)·r̂ )·speed

χ — chemotaxis strength (slider), r̂ — random unit vector

Searching (cyan) — following the gradient uphill toward the strongest plume.
Dosing (yellow) — arrived within capture radius of an infected plant and is dwelling to apply a precision dose, which clears the local source.
Returning (purple) — payload exhausted; heading straight to the depot to recharge before rejoining the search.

This mirrors real precision-agriculture proposals for nanoscale/microscale robotic agents: cheap local sensing plus a chemical gradient replaces GPS or central coordination, so the swarm converges on outbreaks without knowing the field layout in advance. This 2D map view is the field's native coordinate frame — the source 3D scene renders the same grid as a textured ground plane, so nothing about the underlying mechanism changes here, only the camera.

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