Arduino Opta® Micro Programmable Logic Controllers

Arduino Opta® Micro Programmable Logic Controllers (PLCs) are secure, easy-to-use devices with Industrial IoT capabilities. The Opta controllers allow users to scale up automation projects while exploiting the open Arduino ecosystem. Computing power enables various real-time control, monitoring, and predictive maintenance applications. A secure onboard element provides over-the-air firmware updates and remote control via the Arduino Cloud or third-party services.

Products Available

  • Opta Lite with Ethernet onboard and USB-C™ programming ports (AFX00003)
  • Opta RS485 which also adds an RS485 half duplex connectivity interface (AFX00001)
  • Opta Wi-Fi is the most versatile option, also featuring Wi-Fi® / BLUETOOTH® Low Energy connectivity (AFX00002)


  • Easy and fast software development, starting from ready-to-use Arduino sketches, tutorials, and libraries
  • Optional support for standard IEC 61131-3 PLC languages
  • Fieldbus integration via Modbus TCP (Ethernet) and Modbus RTU (serial RS485)
  • Seamless IIoT connectivity (Ethernet / Wi-Fi / Bluetooth Low Energy)
  • Easy DIN rail installation
  • Real-time remote monitoring via intuitive Arduino Cloud dashboards or third-party services
  • Security at the hardware level via onboard secure elements and compliance with X.509 Standard
  • Secure OTA firmware updates and cloud device management
  • High power relay switching (4 x 2.3kW)
  • Reliable by design, thanks to industrial certifications and Finder’s expertise in switching technology


  • Industrial automation
    • Conveyor belt management
    • Gathering time information for automated labeling
    • Real-time monitoring in manufacturing
    • Automated Anomaly Detection
    • Tank management
  • Building automation
    • Intelligent roller blinds management
    • Energy monitoring and optimization
    • Smart sun shields operation
    • HVAC systems control


  • 8x configurable digital/analog (0V to 10V) input
  • STM32H747XI Dual Arm® Cortex® Processor
    • Cortex-M7 core up to 480MHz
    • Cortex-M4 core up to 240MHz
  • Connectivity
    • Support 10/100 Ethernet (TCP/IP or Modbus TCP)
    • USB-C™
    • Wi-Fi + Bluetooth Low Energy (Opta Wi-Fi only)
    • RS485 half duplex (Opta RS485 and Opta Wi-Fi only)
  • Memory
    • 1MB RAM (programming)
    • 2MB internal + 16MB Flash QSPI
  • RTC
    • 10-day (typical) power retention at +25°C
    • NTP sync available through Ethernet
  • IP20 rated
  • 4x relays (250VAC, 10A) output
  • Programming languages
    • Arduino programming language via IDE
    • IEC-61131-3 as an option:
      • Ladder Diagram (LD)
      • Function Block Diagram (FBD)
      • Sequential Function Chart (SFC)
      • Structured Text (ST)
      • Instruction List (IL)
  • ATECC608B secure element
  • 12VDC to 24VDC supply voltage range
  • -20°C to +50°C (-4°F to +122°F) operating temperature range


Featuring two expert panelists from Arduino, this video webinar provides device designers with everything they need to know to develop and scale their industrial automation projects.

View Webinar: Scale Up Automation with the Arduino Opta microPLC


Technical Diagram

Mechanical Drawing - Arduino Opta® Micro Programmable Logic Controllers
Published: 2023-03-22 | Updated: 2024-06-04