A versatile 2-in-1 industrial-grade module for automation and smart home systems: 2 powerful electromechanical relays (10A) and 2 high-precision differential 16-bit analog inputs based on the ADS1115. Perfect for simultaneous load control and sensor monitoring (0-10V, 4-20mA). Fully compatible with the IoTextra/IoTsmart/IoTbase ecosystem.

Description:

The IoTextra Combo is a hybrid module that combines power switching capabilities and high-precision data acquisition in a single compact form factor. It is designed for professional tasks requiring industrial-grade reliability and high measurement accuracy.

Key Features:

• Power Switching: Two high-quality, industrial-grade Omron G5Q-14 SPDT ( 1 Form C ) relays allow switching loads up to 250 VAC / 30 VDC with a current rating of up to 10 A.
• Precision Measurement: Two differential channels with a 16-bit ADS1115 ADC allow measuring both voltage and current (including the 4-20mA standard) with common-mode noise rejection.
• Flexible Control: The module supports relay operation via GPIO (direct control) and/or the I²C bus through the integrated TCA9534 port expander.
• Safety: Full galvanic isolation of digital channels (4000 Vrms) and reverse polarity protection.

Technical Specifications

Relays (Power Switching):

• Channels: 2 x SPDT (1 Form C).
• Relay Type: High-quality Omron G5Q-14.
• Max Voltage: 250 VAC / 30 VDC.
• Isolation: 4000 Vrms (coil-to-contact); 8000V surge resistance.
• Indication: Status LEDs for each channel.

Analog Inputs:

• Resolution: 16-bit (Delta-Sigma).
• Channels: 2 differential inputs.
• Voltage Ranges: 0–0.5V, 0–5V, 0–10V, ±0.5V, ±5V, ±10V.
• Current Ranges: 0–20mA, 4–20mA, ±20mA, 0–40mA.
• Sample Rate: Up to 860 samples per second (SPS).
• Features: Operational amplifiers, Programmable Gain Amplifier (PGA), and a high-stability 2.5V precision reference (REF3425).

General:

• Power Supply: +5V DC.
• Interface: I²C (100kHz, 400kHz, 3.4MHz) via Qwiic or HOST connector.
• Dimensions: 47 x 56 mm (IoTextra standard).

Flexible Usage Modes

1. Standalone: Connect via Qwiic or HOST connector to any microcontroller.
2. Smart Mode: Plug IoTsmart modules (RP2350, ESP32-S3, etc.) directly into the module's HOST connector.
3. Mezzanine Mode: Install into IoTbase series carrier boards (Pico, Nano, etc.).

Compatibility

Fully compatible with popular platforms: Arduino, Raspberry Pi, ESP32, STM32, and Teensy. Supported in Node-RED, Blynk, and IoTflow environments.

Documentation & Resources

All technical details are available in our public repository.