Nautilis iRelay PRO — Smart WiFi Controller Description: The Nautilis iRelay PRO is an advanced modular WiFi environmental controller that builds upon the proven Nautilis V8 temperature controller. Designed for precision and flexibility, it combines temperature control with real-time monitoring of pressure, humidity, and CO₂ — all integrated into one compact device. Perfect for fermentation chambers, kegerators, grow environments, and other applications requiring reliable climate and pressure management.

A smart temperature and environmental controller designed for seamless integration with Home Assistant. It combines precise temperature control with environmental sensing and advanced connectivity.

Key Features Graphical CO₂ visualization with color-coded zones: 🟢 0–1000 ppm (Good), 🟡 1000–1400 ppm (Moderate), 🟠 1400–1800 ppm (Poor), 🔴 Above 1800 ppm (Bad).

Relative humidity display with intuitive color levels: 🔵 0–40% (Dry), 🟢 40–60% (Comfort), 🟠 60–90% (Humid), 🔴 Above 90% (High humidity).

Air pressure monitoring in bar or psi with full calibration support.

Two primary temperature sensors — one internal and one external (2m cable) for remote monitoring and control.

Temperature units selectable in °C or °F.

Calibration support for main sensor.

Supports up to three additional temperature sensors.

Dynamic visual indicators:

🔺 Red arrow when temperature is rising.

🔻 Blue arrow when temperature is falling.

Target temperature background shows system state: 🔴 Heating | 🔵 Cooling | ⚪ Idle | ⚫ Error.

Configurable delay timer and hysteresis display for precise temperature management.

Full iSpindel hydrometer integration — receives and displays all key data (specific gravity, temperature, battery, angle, etc.) and forwards it to Home Assistant.

Independent heating and cooling relay control — both can operate simultaneously or independently. You can disable one or both, turning the device into a monitoring-only unit.

Automatic Home Assistant Discovery for all sensors and relays (no manual setup).

Compact TFT display (240×320) with responsive interface and clear visual status indicators.

Technical Specifications:

Parameter Specification Power Supply 5 V USB-C regulator Communication Wi-Fi (MQTT protocol) ADC Module ADS1115, 16-bit precision (0–5 V input) Sensors 3 × DS18B20, 1 × SCD4x, 1 × Pressure sensor External Data iSpindel WiFi Hydrometer Output 2 × Relay (Heating/Cooling) Pressure Units bar / psi (selectable) Integration Home Assistant auto-discovery Firmware OTA upgradable Display 2″ TFT 240×320 full-color screen

What is included: – 2″ TFT LCD screen – 3d printed case – SCD40 sensor (CO2, Humidity, box temperature) – 1 x thermometer on 2m cable, – USB C power plug built into the box – 3Pin Screw Terminal Block for Pressure Sensor (without sensor) – buzzer – 2 connectors for connecting 2 relays (Heating/Cooling) (without relays) – ESP32 – Supports one iSpindel device – worldwide shipping with tracking number