Supported Devices

The Cannabis Grow Management System supports a wide range of IoT devices for sensor monitoring and automation control.

ESP32 Sensor Devices

Production-ready firmware for ESP32 devices with comprehensive sensor support and MQTT integration.

Hardware Specifications

• Board: ESP32-WROOM-32 (recommended) or compatible ESP32 development board
• WiFi: 2.4GHz WiFi connectivity with automatic reconnection
• Power: 5V USB or external power supply (200-500mA typical)
• GPIO: Multiple GPIO pins for sensor connections

Supported Sensors

Firmware Features

• WiFi connectivity with exponential backoff reconnection
• MQTT communication for sensor data publishing and configuration updates
• OTA (Over-The-Air) firmware updates via HTTP
• Deep sleep mode for battery-powered operation
• Remote configuration via MQTT topics
• Periodic device health and status reporting
• Configurable sensor reading intervals

MQTT Topics

sensors/{growId}/{plantId}/data - Complete sensor payload
sensors/{growId}/{plantId}/temperature - Individual temperature reading
sensors/{growId}/{plantId}/humidity - Individual humidity reading
sensors/{growId}/{plantId}/soilMoisture - Soil moisture reading
devices/{deviceId}/status - Device status updates
devices/{deviceId}/config - Configuration updates (from server)

Getting Started

See the ESP32 Setup Guide for detailed wiring instructions and firmware installation.

ESP8266 Sensor Devices

Lightweight sensor nodes for cost-effective monitoring solutions. ESP8266 devices provide similar capabilities to ESP32 with lower power consumption and cost.

• WiFi connectivity (2.4GHz)
• MQTT communication
• OTA firmware updates
• Compatible with DHT22/DHT11 and analog sensors
• Lower power consumption than ESP32

Automation Controllers

Smart controllers for automated grow operations including lighting, watering, dosing, and climate control.

Light Controllers

Watering Systems

Dosing Systems

Climate Control

Hardware Setup Guide

Complete hardware wiring guide for ESP32 sensor devices.

Pin Connections

DHT22/DHT11 Sensor

DHT22/DHT11          ESP32
─────────────────────────────────
VCC (Pin 1)    →     3.3V
DATA (Pin 2)   →     GPIO 4
                     (with 10kΩ pull-up to 3.3V)
GND (Pin 3)    →     GND

Soil Moisture Sensor

Soil Moisture Sensor  ESP32
─────────────────────────────────
VCC            →      3.3V
GND            →      GND
OUT/AO         →     GPIO 34 (ADC1_CH6)

Power Supply

• USB Power: Connect ESP32 via USB cable (5V, 200-500mA typical)
• External Power: 5V DC via VIN pin or USB
• Battery Operation: 3.7V LiPo battery with proper regulation for 3.3V operation

Calibration

Soil Moisture Sensor

1. Dry Calibration: Remove sensor from soil, let dry completely, read ADC value (~4095)
2. Wet Calibration: Submerge sensor in water, read ADC value (~1500)
3. Update Code: Set calibration values in firmware configuration

Over-The-Air (OTA) Updates

Update device firmware remotely without physical access to devices.

• HTTP-based firmware updates
• Version tracking and rollback support
• Deployment status monitoring
• Template-based firmware generation
• Device-specific configuration injection

See OTA Update Guide for detailed instructions.

Supported Device Types

The system supports registration and management of the following device types:

• ESP32: Full-featured sensor nodes with comprehensive capabilities
• ESP8266: Lightweight sensor nodes for cost-effective solutions
• Arduino: Custom Arduino-based devices with MQTT support
• Raspberry Pi: Raspberry Pi-based monitoring and control systems
• Other: Custom IoT devices with MQTT communication

MQTT Integration

All devices communicate via MQTT protocol for reliable, scalable IoT communication.

MQTT Broker

• Mosquitto MQTT broker
• Username/password authentication
• Topic-based message routing
• QoS levels for message reliability

Message Format

Sensor data is published in JSON format:

{
  "deviceId": "esp32-001",
  "timestamp": "2024-01-01T00:00:00Z",
  "growId": "507f1f77bcf86cd799439011",
  "plantId": "507f191e810c19729de860ea",
  "metrics": {
    "temperature": 72.5,
    "humidity": 65.0,
    "pH": 6.5,
    "co2": 400,
    "ec": 1.2,
    "soilMoisture": 45
  }
}