IoThing Digital – Digital I/O module with two high-power relays and two isolated AC or DC input channels


IoThing Digital is a professional digital I/O module with two high-power Omron G5Q-14 relays and two digital input channels (based on Texas Instruments ISO1211). It allows digital input of both DC and AC signals, so you are not limited in your choice of input voltage level. You can choose the voltage range yourself, for example, 60 VDC or 220 VAC or any other, up to 300 V. The design of this board also integrates a DC-DC converter and a slot for mikroBUS modules.

IoThing Digital can be used as an add-on module for popular SoMs such as Raspberry Pi, Arduino, Adafruit, Particle, SparkFun, Teensy boards and others. We will also be providing PCBs based on LPC824, SAMD21 and STM32F411 microcontrollers as add-on options during this campaign. As a bonus, IoThing Digital measures 65 mmx 56 mm and corresponds to the popular format of the Raspberry Pi 3A+, which greatly simplifies its use with the Raspberry Pi.

Perfect for Professionals and Hobbyists

IoThing Digital is perfect for engineers who are designing distributed / decentralized control systems, developers of modern IoT and IIoT (in which our module can be used as a basis for building compact embedded systems), and even amateur designers who automate everything – from thermometers in windows, to heating systems, up to the implementation of smart homes and smart farms.

Features & Specifications

  • MCP23008 chip with I2C bus for relay control and digital signal input
  • Supports 100 kHz and 400 KHz on I2C bus
  • Selection of one of eight addresses on the I2C bus for the MCP23008 using jumpers on the bottom-side of the module, default address is 0100 010x
  • Grove connector for external module with I2C bus
  • Compatible with major well-known microcontrollers
  • 2 SPDT relays
  • Current consumption of each relay is less than 80 mA
  • Characteristics for resistive load: 3 A 30 VDC or 3 A 250 VAC
  • Dielectric strength: 4 kV VAC, for 1 minute between coil and contacts; 1 kV VAC, for 1 minute between contacts of the same polarity
  • Compliant to IEC 61131-2; Type 1, 2, 3 characteristics for 24 V insulated digital inputs
  • You can enter the values of two digital signals, from 9 V to 300 V, DC and AC
  • Accurate Current Limit for Low-Power Dissipation – 2.2 mA to 2.47 mA for Type 3
  • The maximum insulation voltage (up to 60 s) is 3600 VPK
  • Maximum working insulation voltage: AC – 400 VRMS, DC – 566 VDC
  • Reverse polarity protection
  • Modules you can install with the mikroBUS bus:
    • our modules (SoM Lite series and other modules),
    • Click® modules from MikroElekronika
  • Power supply: non-isolated, 9-36 VDC
  • Size: 65 x 56 mm. The format of the module corresponds to the popular format of the Raspberry Pi 3A+, which greatly simplifies its use with the Raspberry Pi.

Open Source Documentation

You can find documentation and board schematics in our datasheet.

Interested in This Project?

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This module and our other products are described in more detail at www.makethingshappy.com



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