Smart Farm Automation

Industrial-grade control systems adapted for agricultural production. Designed before the first seed goes in the ground.

ISA-95 Farm Hierarchy

The same framework that runs billion-dollar factories, scaled for a self-sustaining farm.

Level 4 — Business

Farm-wide planning, financials, and market decisions.

  • Crop yield forecasting
  • Cost/revenue tracking
  • Market price monitoring
  • Seasonal planning calendar

Level 3 — Operations

Day-to-day farm management and execution.

  • Planting/harvest scheduling
  • Inventory (seeds, feed, fuel)
  • Quality tracking per crop/batch
  • Work order management

Level 2 — Supervisory Control

Automated decision-making and system monitoring.

  • Irrigation control logic
  • Climate response (shade, venting)
  • Solar/battery management
  • Alarm management (ISA-18.2)

Level 1 — Sensing & Actuation

Physical sensors and actuators in the field.

  • Soil moisture / temp probes
  • Weather station (wind, rain, UV)
  • Water flow meters
  • Solenoid valves, pumps

Core Automation Systems

Each system designed as a modular unit. Build one, prove it, add the next.

Irrigation Control System

Closed-loop irrigation based on soil moisture, weather forecast, and crop requirements. No water wasted. Every zone independently controlled.

Soil Moisture Sensors Solenoid Valves PID Control Zone Mapping Weather API Integration Drip / Sprinkler Hybrid

Control logic: IF soil_moisture < setpoint AND rain_forecast < 2mm/24hr AND time_in_window THEN irrigate_zone(n) FOR calculated_duration. Log everything. Trend everything.

Solar Power & Energy Management

Off-grid solar array with battery storage. The farm's nervous system runs on sunlight. Monitor production, consumption, and battery state in real time.

PV Panels MPPT Charge Controllers LiFePO4 Battery Bank Inverter Monitoring Load Shedding Logic kWh/Unit Tracking

Weather & Climate Monitoring

On-site weather station feeding data into every other system. Historical trends build the knowledge base for better decisions each season.

Temp / Humidity Wind Speed / Direction Rainfall Gauge UV Index Barometric Pressure Data Logging

Soil Health Monitoring

Continuous soil data across zones. pH, moisture, temperature, and eventually nutrient levels. The foundation for precision agriculture.

Multi-depth Probes pH Sensors EC (Conductivity) Temperature Zone Mapping Trend Analysis

Water System Management

Well pump control, storage tank levels, filtration system monitoring, and distribution pressure. Water is life — treat the system accordingly.

Tank Level Sensors Pump Run/Stop Control Pressure Monitoring Flow Totalization Filter dP Monitoring Leak Detection

Farm Dashboard (HMI)

ISA-101 compliant visualization. Not a pretty dashboard — an effective one. Situational awareness first, aesthetics second. Gray backgrounds, meaningful colors, progressive detail.

Web-Based HMI Real-time Data Alarm Summary Trend Displays Mobile Responsive Historical Reports

Design principle: Follow ISA-101 layering. L1 overview shows whole farm status at a glance. Drill into areas, then units, then diagnostics. Color means something — gray is normal, green is running, red needs action.

Data Pipeline

How data flows from the soil to the screen.

Protocol Stack

Field Level: Modbus + GPIO

Sensors and actuators communicate via Modbus RTU/TCP or direct GPIO to local controllers. Simple, proven, cheap. RS-485 runs long distances across the farm without issues.

Modbus RTU (RS-485) Modbus TCP GPIO (local I/O) 4-20mA Analog

Edge Level: MQTT + Sparkplug B

Edge controllers (Raspberry Pi, ESP32 clusters) publish data via MQTT with Sparkplug B payload format. Birth/death certificates, metric definitions, store-and-forward on disconnect.

MQTT v5 Sparkplug B Eclipse Mosquitto Store & Forward

Application Level: Time-Series DB + Web

All data lands in a time-series database. Grafana or custom dashboards for visualization. REST API for integration. Everything queryable, everything trended.

InfluxDB / TimescaleDB Grafana Node-RED REST API

Farm KPIs

What gets measured gets managed. Industrial metrics adapted for agriculture.

Water Efficiency L/kg Liters of water per kg of produce
Energy Balance kWh Generated vs consumed daily
Yield / Area kg/m² Crop output per unit area
Soil Health Index 0-100 Composite pH, moisture, EC score
System Uptime % Automation system availability
First Pass Yield % Harvest quality rate

OEE for farming? Adapted from manufacturing: Availability (growing days vs downtime) x Performance (actual yield vs theoretical max) x Quality (sellable produce vs total harvest). Track it per crop, per zone, per season. Improve relentlessly.

Alarm Strategy

Every alarm is actionable. No nuisance alarms. No alarm floods.

Alarm Priority Matrix

Priority Response Example
P1 — Emergency Immediate Water tank empty, pump cavitation
P2 — High <1 hour Irrigation zone failure, battery low
P3 — Medium Same day Soil moisture deviation, sensor drift
P4 — Low Next check Filter change due, data gap detected

Target metrics: <6 alarms per hour average. Zero alarm floods. Every alarm documented with consequence and required response. Annual rationalization review.

Recommended Stack

Affordable, repairable, available in Brazil. No vendor lock-in.

Edge Controllers

  • Raspberry Pi 4/5 — MQTT broker, Node-RED, database host
  • ESP32 — Field sensor nodes, WiFi/BLE, ultra-low power
  • Arduino Mega + Ethernet — Modbus RTU gateway, local I/O

Sensors

  • Capacitive soil moisture — No corrosion, long life
  • DS18B20 — Waterproof temperature, 1-Wire bus
  • BME280 — Temp / humidity / barometric pressure
  • Tipping bucket rain gauge — Mechanical reliability
  • Ultrasonic level sensors — Tank water levels, non-contact
  • Hall effect flow sensors — Pipe flow measurement

Actuators

  • 12V/24V solenoid valves — Irrigation zone control
  • VFD (Variable Frequency Drive) — Pump speed control
  • Relay modules — On/off control for pumps, fans, lights

Power

  • Solar panels — Mono-crystalline, locally sourced
  • MPPT charge controllers — Victron or equivalent
  • LiFePO4 batteries — Long cycle life, safe chemistry
  • Pure sine wave inverter — Clean power for electronics

Networking

  • LoRa (SX1276) — Long range field sensor comms, low power
  • WiFi mesh — Near-building coverage
  • RS-485 — Modbus backbone, noise immune, long runs
  • 4G/LTE modem — Remote access and alerts

Ready to Wire It Up

The automation gets designed now. When the land is bought and the first post goes in the ground, the sensor network goes in with it.

Back to The Plan