IoTextra Input
8-channel digital input module · galvanic isolation · 3750V RMS · TVS protection
Max input voltage 36 VDC · GPIO and/or I²C modes · HOST and Qwiic connectors · 47×56 mm · 5 VDC supply
Part of the IoTextra series · compatible with IoTsmart and IoTbase · Open Hardware
This module is a member of the IoTextra series, which serves as a fundamental building block of our ecosystem and embodies the Make Things Happy Philosophy. It is engineered to bridge the gap between rapid prototyping and industrial-grade reliability.
Hardware Synergy: The module is compatible with both IoTsmart and IoTbase series.
Software Power: This hardware compatibility unlocks the full potential of the IoTflow platform. It enables you to:
- Create custom Node-RED nodes effortlessly.
- Integrate via MQTT with third-party global platforms like Blynk.
- Scale your project from a single node to a complex industrial network.
Key Specifications
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Supply voltage: 5VDC, feeding an onboard 3.3V regulator for the logic section. Reverse-polarity protected.
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Input voltage range: up to 36VDC per isolated channel
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Isolation: 3750 Vrms per channel
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GPIO Mode: input states read via AP0–AP7 signals on the HOST-P connector
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I²C Mode: input states read via I²C using the onboard I/O expander (TCA9534 or compatible); up to 16 modules on one bus
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Hybrid control: some channels via HOST-P GPIO, others via the I²C expander, simultaneously
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Connectors: HOST-P10 or HOST-P12, Qwiic × 2
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Protection: Reverse polarity, ESD (TVS diode assembly on Qwiic connectors), transient suppression
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Status indication: per-channel digital input status LEDs
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Compatibility: Raspberry Pi, Raspberry PICO, Arduino Nano, Adafruit Feather, Teensy, ESP32, SeeedStudio XIAO, Nucleo, and others
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Size: 47 × 56 mm, with mounting holes for base-module or Raspberry Pi installation
Operation Modes
🔌 Standalone
Control via HOST-P10/P12 cable or Qwiic I²C connectors from any host.
🧠 Smart
Insert an IoTsmart module (ESP32-S3, RP2350, RP2040, XIAO) vertically into HOST-P12.
🏗 Mezzanine
Install into an IoTbase carrier board (PICO, Nano) for expanded system integration.
Applications
🏭
IIoT — Machine & Cabinet Status Monitoring
Limit switches, e-stops, pressure switches, cabinet-door contacts — 8 isolated channels per module. Use with Node-RED or IoTflow for a real-time equipment status dashboard.
🏢
Building Automation / HVAC
Damper feedback, filter-clog switches, fan/pump run status — up to 16 modules per I²C bus. Integrates with Home Assistant for zone-by-zone control.
🌱
Smart Farming
Water-level floats, irrigation valve position, greenhouse door/vent contacts — 24–36V-tolerant field wiring. Supports Node-RED and IoTflow for sensor-triggered scheduling.
🔒
Smart Home — Security & Access
Door/window reed switches, PIR motion contacts, enclosure tampers. Node-RED publishes over MQTT to Blynk for instant mobile alerts.
