What is it?

This is an industrial embedded controller based on the STM32F407VGT6, designed to serve as the central processing unit for automation and control systems.

Unlike typical development boards, this platform integrates industrial communication interfaces, storage, real-time clock, and 24V power support into a single compact solution.

It is designed to directly interface with external I/O modules and field devices, making it ideal for building custom PLCs, industrial controllers, and IoT systems.

Why this board is different

Most STM32 development boards:

• Operate at 5V or USB power only
• Lack industrial communication interfaces
• Require external modules for storage, RTC, and field connectivity

This board provides a complete system-level solution:

• 24VDC industrial power input (18–30V range)
• Integrated RS485 and CAN bus communication
• On-board storage (SPI Flash + microSD)
• High-precision RTC with backup battery
• Built-in USB-C to UART interface for programming and debugging

👉 It is designed for real industrial applications, not just prototyping

Key Features

• STM32F407VGT6 (ARM Cortex-M4, up to 168 MHz)
• 1 MB Flash / 192 KB RAM
• 24VDC industrial power input (18–30V supported)
• On-board switching regulator (3.3V system supply)
• RS485 communication interface (with direction control)
• CAN Bus interface (with selectable termination)
• USB-C to UART (CP2102) for programming and debugging
• External SPI Flash memory (W25Q128 – 128 Mbit)
• microSD card slot for data logging and storage
• DS3231 high-accuracy RTC with backup battery (CR1220)
• SPI, I2C, UART expansion connectors
• Multiple chip-select lines for SPI expansion
• Status LEDs and user controls

Communication Interfaces

• RS485 – Industrial serial communication (Modbus, etc.)
• CAN Bus – Field device communication
• USB-C UART – Debugging and firmware upload
• SPI – High-speed expansion (I/O modules, memory)
• I2C – Peripheral and sensor interface
• UART (x2) – External serial devices

This makes the board suitable as a central controller in distributed systems

Typical Applications

• Custom PLC and industrial controller development
• Industrial automation systems
• Modbus / CAN gateways
• Data logging and monitoring systems
• IoT edge devices
• Test and control platforms

Integration

• Connect external I/O modules via SPI or I2C
• Communicate with field devices using RS485 or CAN
• Store data locally using SPI Flash or microSD
• Program and debug via USB-C

👉 Designed to work seamlessly with EA Control Tech I/O modules (DI, DO, Analog)

System Architecture

• Central MCU: STM32F407 (handles control and communication)
• Power: 24V → regulated 3.3V system supply
• Storage: SPI Flash + microSD
• Timekeeping: RTC with battery backup
• Communication: RS485, CAN, SPI, I2C, UART

This architecture allows building complete embedded control systems on a single platform.

Important Notes

• Designed for 24VDC industrial systems
• All interfaces use 3.3V logic levels
• Ensure proper termination when using RS485/CAN
• Use proper grounding and wiring practices
• Power down before modifying connections