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Instrumentation priority matrix — two-site smart farm

Purpose

Rank where automation earns its keep first for a 35-minute separated operation: trip reduction, risk reduction, and labor relief—with explicit cost of false positives and maintenance.

Architecture package: Reference architecture — 5 ac + 120 ac. Aligns with East Tennessee two-site farm business plan — smart-tech strategy and Field telemetry reference architecture — homestead + 120-acre farm. Financial shell (payback inputs, OPEX, triage hours): Instrumentation ROI model.


First acres, first risks, first systems

Intent: Order work so instrumentation follows operational truth—water, power, access—not dashboard novelty.

First acres (where to instrument before “everywhere”)

Priority Land / infrastructure Why first
P0 Water delivery points stock depend on Welfare + highest trip ROI
P0 Pump / electrical head for that water Silent failure modes
P1 Lanes / gates on critical paths Escape and labor if motorized
P2 Representative paddock for grazing pressure Not every acre on day one

First risks (what failure must surface early)

Risk class Example signal Manual cross-check
Dehydration / dry tank Level / flow / pump run Visual schedule
Unknown pump state Current, pressure, run hours Physical at asset
Power loss at remote hub UPS / battery / generator status Visit + sound
Fence breach (if instrumented) Break detection (optional) Patrol still required

First systems (stack order—not brands)

Order System Role
1 Stable field → hub comms Nothing else matters if backhaul is flaky
2 Time sync at edges Comparable logs—Timing on the farm — synthesis
3 Durable telemetry store (SoR rules) History for debugging and trend
4 Dashboards / automation After 1–3 are credible

See Telemetry system of record — boundaries and authority.

Key decisions supported

Decision Use matrix for
Phase 1 pilot sensor Only rows scoring high on trip ROI + feasible install
OPEX cap Sum annual subscription + spares for enabled rows
What NOT to buy Low trip ROI + high alert fatigue
Manual proof first Rows with “manual first” gate unchecked → no remote control

Scoring columns (1–5 each; total /25 optional)

Criterion Meaning
Trip ROI Reduces unnecessary SITE_FARM visits
Risk Prevents catastrophic loss (stock, crop, equipment)
Labor Reduces hours (not just miles)
Capital Reasonable CAPEX for phase (5 = cheap pilot)
Ops burden Low false positives, spares available, simple triage

Priority matrix (fill)

ID Instrument / signal Trip ROI Risk Labor Capital Ops burden Manual proof first? Phase target Notes
I1 Tank / trough level Y—stick log 30d 0–1
I2 Pump run / fault / pressure Y 1
I3 Gate position (if motorized) Y—safe default 2
I4 Power / generator / UPS at critical loads partial 0–1 home + farm
I5 Soil moisture (point) Y—calibrate to crop 3+ defer if grazing-only
I6 Weather station optional 1
I7 Cameras policy first 2+ privacy, triage load
I8 GPS collars / tags market proof 3+ OPEX heavy
I9 Irrigation valve control walk lines first 3+

Automate early (typical winners)

  • Water visibility + pump fault: highest trip ROI for remote pasture.
  • Power awareness at remote pump or gateway: explains silent failures.

Automate late or never (until gates pass)

Item Why wait
Camera everywhere Bandwidth, storage, alert noise
Remote chute / feed actuation Safety + liability
Full irrigation automation Crop commitment + skill

Manual-before-automation checklist

Known / assumed / open

Class Content
Known Business plan prioritizes telemetry with degraded modes
Assumed LTE or fallback at SITE_HOME acceptable for non-life alerts
Open Radio technology choice (LoRaWAN vs Meshtastic); exact tank count