Key Features

• ATmega328 microcontroller for embedded control and automation
• Quectel M08-R GSM/GPRS module for cellular communication
• 16×2 character LCD for displaying system status, parameters, messages, and sensor values
• LM2596-ADJ adjustable DC-DC buck converter for efficient power regulation
• Serial/UART communication between the MCU and GSM module
• Compact integrated controller design
• Suitable for sensor and actuator interfacing
• Easy firmware development and customization
• Designed for automation, monitoring, and remote-control applications

ATmega328 Microcontroller

The onboard ATmega328 provides the main processing and control functionality. It can be programmed to read sensors, process data, control relays or other outputs, communicate with the GSM module, and display information on the LCD.

It is well suited for applications requiring a simple, reliable, and cost-effective embedded controller.

Quectel M08-R GSM/GPRS

The Quectel M08-R is an industrial-grade quad-band GSM/GPRS module supporting GSM 850, EGSM 900, DCS 1800, and PCS 1900 MHz. It supports GPRS data communication and SMS, making the board suitable for remote monitoring and control applications.

The module supports interfaces including UART, SIM, audio, RTC, and antenna connection, with GPRS data rates up to 85.6 kbps.

16×2 LCD Display

The integrated 16×2 character LCD provides a simple user interface for displaying:

• Sensor readings
• GSM/network status
• Device operating status
• Error messages
• Configuration parameters
• Counters and measurements
• System notifications

LM2596-ADJ Power Supply

The onboard LM2596-ADJ adjustable buck converter provides efficient DC-DC voltage conversion and allows the output voltage to be configured according to the requirements of the circuit.

It is useful when operating the controller from common DC power sources such as 12V or 24V supplies, subject to the board’s actual input/output specifications.

Applications

• GSM-based industrial automation
• Remote equipment monitoring
• SMS-based control systems
• Remote ON/OFF control
• Security and alarm systems
• Energy and meter monitoring
• Pump and motor monitoring
• Agricultural automation
• Temperature and sensor monitoring
• Remote data logging
• Machine status monitoring
• Access-control systems
• M2M communication projects

Key Features

• Quectel EC600U 4G LTE module
• OpenCPU / QuecOpen application development
• Integrated user keypad for local control and menu navigation
• Multiple GPIO expansion pins
• GPIOs can be configured as digital inputs or outputs for connecting external devices.
• Support for GPIO interrupt-based applications
• UART interfaces for external controllers and industrial peripherals
• USB interface for programming, debugging and communication
• SIM card interface
• Cellular antenna interface
• Status LEDs for easy monitoring
• Expansion headers for customized hardware development
• Suitable for rapid prototyping and production-oriented IoT designs

OpenCPU Development

One of the main advantages of this board is that the EC600U can act as both the cellular communication module and application processor. This allows developers to build application logic directly on the module instead of necessarily requiring a separate STM32, Arduino, or other MCU.

This architecture can reduce PCB size, component count, firmware complexity, and overall system cost for suitable applications.

GPIO Expansion

The board exposes GPIO resources for connecting external peripherals such as:

• Relays
• LEDs
• Push buttons
• Sensors
• Buzzers
• Digital inputs
• Motor-control interfaces
• External ICs
• Custom expansion circuits

Quectel documents EC600U GPIO support for input/output operation and interrupt functionality; the exact available pins depend on the specific EC600U variant and pin multiplexing configuration.

Integrated Keypad

The onboard keypad provides a convenient local user interface for applications that require user input without adding an external keyboard.

It can be used for:

• Device configuration
• Parameter entry
• Menu navigation
• Password/PIN entry
• Machine control
• Alarm acknowledgement
• Local ON/OFF commands

Applications

This EC600U OpenCPU board is suitable for:

• 4G IoT gateways
• Industrial automation
• Remote machine monitoring
• GPS/asset tracking systems
• Smart energy monitoring
• Remote pump control
• Agriculture automation
• Security and alarm systems
• Vending and payment-related equipment
• Smart meters
• Fleet and vehicle monitoring
• Remote relay controllers
• Data acquisition systems
• M2M communication
• Custom 4G IoT products

The Industrial 8-Channel Relay Controller Board is a powerful embedded control platform designed for industrial automation, remote switching, IoT applications, pump control, motor control, lighting, HVAC, and other high-load switching requirements.

The board combines an STM32 32-bit microcontroller, EC800K 4G communication module, LM2596 DC-DC power supply, and 8 high-capacity 30A relays in a single compact controller.