Industrial IoT Controller Board – STM32 + ESP32 + GSM/GPS + RS485 + Dual Relay

Key Product Features

• Dual-controller architecture – STM32 + ESP32
• STM32 microcontroller for real-time control and I/O processing
• ESP32 module for Wi-Fi and Bluetooth connectivity
• GSM/GPRS cellular communication module
• GPS/GNSS location capability
• Remote data transmission over cellular network
• Wi-Fi connectivity
• Bluetooth/BLE capability
• RS485 communication interface
• UART serial communication interfaces
• FTDI/UART programming interface
• Multiple external input/output connectors
• Multiple STM32 GPIO connections
• Multiple ESP32 GPIO connections
• 2 onboard relay outputs
• Relay-based external load/control interface
• Dedicated motor/output connection
• External field-device connectivity
• Multiple JST-style plug-in connectors
• Screw-terminal connections for field wiring
• 12V DC input
• Onboard voltage regulation/power-management section
• Status LEDs
• User/programming push buttons
• Onboard buzzer for audible indication/alarms
• Boot/reset controls
• Modular controller design allowing firmware customization
• Mounting holes for enclosure/panel integration

Communication Interfaces

This is one of the strongest selling points, so I would give it a separate section:

Wi-Fi: Via ESP32
Bluetooth/BLE: Via ESP32
GSM/GPRS: Cellular remote connectivity
GPS/GNSS: Location/tracking
RS485: Industrial wired communication
UART: Controller/peripheral communication
FTDI/UART: Firmware programming/debugging

Depending on the exact GSM/GPS module fitted, we should state the supported cellular technology precisely—for example 2G/4G/LTE—only after confirming the module part number. The visible module marking isn’t clear enough for me to state that confidently from this image.

I/O & Control Features

The board can be described as supporting:

Digital Inputs: Multiple external inputs through dedicated connectors
Digital Outputs: Multiple controller GPIO outputs
Relay Outputs: 2 onboard electromechanical relays
Motor/Load Interface: Dedicated terminal connection visible on PCB
Sensor Interfaces: Multiple connectors for external sensors/modules
UART Devices: External serial peripherals
RS485 Devices: Industrial sensors/meters/controllers
Alarm Output: Onboard buzzer
Status Indication: Multiple LEDs

Potential Applications

This board can be marketed for:

• Industrial IoT gateways
• Machine monitoring systems
• Remote equipment monitoring
• GPS vehicle/equipment tracking
• Fleet-management hardware
• Smart locking systems
• Asset tracking
• Pump and motor monitoring
• Tank-level monitoring
• Remote telemetry systems
• Industrial data loggers
• Factory automation
• RS485/Modbus monitoring
• Remote alarm systems
• GSM-based controllers
• Smart agriculture controllers
• Energy monitoring
• Building automation
• Custom OEM IoT products

Suggested Technical Specifications

Product Description

The STM32 ESP32 GSM/GPS Industrial IoT Controller Board is a versatile embedded control and communication platform designed for industrial IoT, automation, telemetry and remote monitoring applications.

The board combines an STM32 microcontroller for real-time control and I/O processing with an ESP32 for Wi-Fi and Bluetooth connectivity. Integrated cellular and positioning capability enables remote communication and location-aware applications.

For industrial equipment integration, the board provides RS485, UART, multiple external I/O connections and dual onboard relay outputs, allowing connection with sensors, machines, actuators and other field devices.

Its multi-interface architecture makes it suitable as a development platform or controller for customized IoT gateways, machine monitoring systems, tracking devices, smart locks, remote controllers and industrial automation products.