The Arduino Opta Lite Micro PLC is a next-generation programmable logic controller designed to bridge industrial automation and IoT. Equipped with an STM32H747XI dual-core Cortex-M7 + M4 processor, it offers exceptional performance for real-time control, monitoring, and predictive maintenance tasks. Supporting both Arduino sketches and industry-standard PLC languages such as Ladder Logic (LD) and Function Block Diagram (FBD), the Opta Lite ensures versatility and ease of integration. With built-in Ethernet and USB-C connectivity, it enables seamless communication and deployment in industrial environments. Its compact form factor, robust performance, and support from the Arduino Pro ecosystem make it the perfect choice for engineers, educators, and IoT developers aiming to modernize automation solutions. Featured By RoboticsBD.
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Arduino Opta, specially designed for PLC engineers, is a secure, easy-to-use micro PLC with industrial IoT capabilities.
Opta is equipped with frequently used networks and protocols in multiple industries, and supports both Arduino sketch and standard PLC languages, including LD (Ladder Logic Diagram) and FBD (Function Block Diagram). Its powerful STM32H747XI dual-core Cortex-M7 + M4 MCU allows users to perform real-time control, monitoring and implement predictive maintenance applications.
Secure and durable by design, Opta supports OTA firmware updates and ensures data security from the hardware to the Cloud thanks to the onboard secure element and X.509 standard compliance. Meanwhile, it maintains Arduino Pro's signature easy deployment in production thanks to a vast range of readily available software libraries and Arduino sketches. Last but not least, various connectivity options make keeping everything under control effortless via real-time dashboards combined with intuitive Arduino Cloud (or third-party services). Users can update wireless firmware and achieve remote control easily.
Opta is mainly programmed on Arduino PLC IDE, which makes PLC programming easy. Choose any of the 5 programming languages defined by the IEC 61131-3 standard (Ladder, Functional Block Diagram, Structured Text, Sequential Function Chart, or Instruction List) and users can quickly code PLC applications or port existing ones to Arduino Opta.
Figure 2: Connection Diagram for Modbus RTU with RS-485 interface
Integrate the micro PLC with users' existing machines, devices, and production lines, or combine it with other elements in the modular and versatile Arduino ecosystem, from small and smart sensor-packed modules to SOMs to gateways, for end-to-end solutions that can be customized to meet any need.
Arduino Opta is available in three variants:
Arduino Opta Lite: onboard Ethernet and USB-C ports
Arduino Opta RS485: onboard Ethernet and USB-C ports, plus RS-485 connectivity
Arduino Opta WiFi: onboard Ethernet and USB-C ports, plus RS-485 and WiFi/Bluetooth LE
USB-TTL converter. Logic Level: 5V. Operating Supply Voltage: 5V. Digital I/O Pins: 14. Analog I/O Pins: 6. The board color, shape, and parts may differ from the pictures due to rotating stock.
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Compact Micro PLC designed for industrial IoT and automation projects Powered by STM32H747XI dual-core Cortex-M7 + M4 MCU for real-time control Supports Arduino sketches & standard PLC languages (LD, FBD) Integrated Ethernet & USB-C ports for reliable connectivity Ideal for predictive maintenance, monitoring, and automation Backed by Arduino Pro...
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Controls Operator and display panel with background lighting Power supply Interface for expansion modules Interface for the program module (card) and a PC cable Pre-configured standard functions, e.g. on- and off-delays, pulse relay and softkey Timer Digital and analog flags Inputs and outputs, according to the device type.
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Compact Micro PLC designed for industrial IoT and automation projects
Powered by STM32H747XI dual-core Cortex-M7 + M4 MCU for real-time control
Supports Arduino sketches & standard PLC languages (LD, FBD)
Integrated Ethernet & USB-C ports for reliable connectivity
Ideal for predictive maintenance, monitoring, and automation
Backed by Arduino Pro ecosystem with extensive libraries and community support
