# Arduino Opta Lite

> Entry-level industrial micro PLC with STM32H747 dual-core Cortex-M7/M4, Ethernet, 4\u00d72.3kW relays, Modbus TCP, hardware security, DIN rail mount, and IEC 61131-3 PLC programming — the affordable path to Arduino-powered industrial control.

## Quick Facts

- **Brand:** Arduino
- **Board Type:** industrial-controller
- **Price:** ~$127
- **Product Readiness:** consumer
- **CPU:** ARM Cortex-M7 @ 480MHz,Cortex-M4 @ 240MHz
- **CPU Architecture:** ARM Cortex-M7
- **CPU Cores:** 2
- **RAM:** 1MB SRAM
- **Flash:** 2MB
- **USB:** USB-C
- **Power:** 12-24V DC industrial
- **Operating Voltage:** 3.3V
- **Dimensions:** DIN rail (4 modules wide)
- **Weight:** 200g
- **Antenna:** No
- **SD Card:** No

## Connectivity

- **Ethernet:** 10/100 Mbps

## Open Source

- **Firmware:** Yes
- **Schematics:** No
- **PCB Layout:** No

## Certifications

CE, UL

## Compatible Firmware

arduino

## Use Cases

- industrial-automation
- smart-switch
- industrial-iot

## Components

- **STM32H747XI** (mcu): STM32H747XI with Cortex-M7 at 480MHz and Cortex-M4 at 240MHz for real-time PLC control. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Fdatasheet%2Fstm32h747xi.pdf&ref=openhardware.directory&product=arduino-opta-lite&source=md-export)

## Protocols

- **Modbus TCP**: notes: Via Ethernet port
- **Ethernet**: notes: RJ45 port
- **I2C**: notes: Via expansion port

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| I1 | Analog/Digital Input | ADC | digital-input, adc |
| I2 | Analog/Digital Input | ADC | digital-input, adc |
| I3 | Analog/Digital Input | ADC | digital-input, adc |
| I4 | Analog/Digital Input | ADC | digital-input, adc |
| I5 | Analog/Digital Input | ADC | digital-input, adc |
| I6 | Analog/Digital Input | ADC | digital-input, adc |
| I7 | Analog/Digital Input | ADC | digital-input, adc |
| I8 | Analog/Digital Input | ADC | digital-input, adc |
| R1 | Relay Output (2.3kW) |  | digital-output |
| R2 | Relay Output (2.3kW) |  | digital-output |
| R3 | Relay Output (2.3kW) |  | digital-output |
| R4 | Relay Output (2.3kW) |  | digital-output |

## Description

## Overview

The Arduino Opta Lite is the most affordable entry point to Arduino's industrial PLC lineup. It shares the same STM32H747XI dual-core processor and robust industrial enclosure as the Opta WiFi, but trades WiFi and Bluetooth for a lower price, making it ideal for wired industrial installations where Ethernet is the primary network.

The Opta Lite includes Ethernet connectivity with Modbus TCP support, four 2.3kW relay outputs for direct AC load switching, 8 configurable analog/digital inputs, and USB-C for programming. Hardware security via the onboard secure element ensures encrypted communication, and the DIN rail mounting fits standard industrial panels.

Supporting IEC 61131-3 PLC languages (Ladder Logic, Function Block Diagram) alongside the Arduino IDE, the Opta Lite bridges the gap between traditional PLCs and modern IoT development. CE and UL certified for deployment in production environments.

## Where to Buy

- [Arduino Store (US)](https://openhardware.directory/r?to=https%3A%2F%2Fstore-usa.arduino.cc%2Fproducts%2Fopta-lite&ref=openhardware.directory&product=arduino-opta-lite&source=md-export) — $127.00
- [Arduino Store (EU)](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Fopta-lite&ref=openhardware.directory&product=arduino-opta-lite&source=md-export) — €140.76
- [DigiKey](https://openhardware.directory/r?to=https%3A%2F%2Fwww.digikey.com%2Fen%2Fproducts%2Fdetail%2Farduino%2FAFX00003%2F17629433&ref=openhardware.directory&product=arduino-opta-lite&source=md-export) — $148.00
- [Mouser](https://openhardware.directory/r?to=https%3A%2F%2Fwww.mouser.com%2FProductDetail%2FArduino%2FAFX00003&ref=openhardware.directory&product=arduino-opta-lite&source=md-export) — $148.00

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Fopta-lite&ref=openhardware.directory&product=arduino-opta-lite&source=md-export)
- [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fhardware%2Fopta%2F&ref=openhardware.directory&product=arduino-opta-lite&source=md-export)
- [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fdatasheets%2FAFX00003-datasheet.pdf&ref=openhardware.directory&product=arduino-opta-lite&source=md-export)

## Tags

`arduino`, `opta`, `plc`, `industrial`, `ethernet`, `modbus`, `relay`, `din-rail`

## Images

![Arduino Opta Lite](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-opta-wifi/1d1956790554.jpg)

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