EBYTE E77-400M22S / E77-900M22S STM32 Wireless LoRaWAN Module User Manual

1. Introduction

The EBYTE E77-400M22S and E77-900M22S are low-power wireless modules based on the STM32WLE5CCU6 chip, featuring an ARM Cortex-M4 core. These modules support the LoRaWAN 1.0.3 protocol and operate in the 433MHz and 915MHz frequency bands, respectively. Designed for various IoT applications, they offer real-time functionality, digital signal processing, and low voltage operation, making them suitable for intelligent agriculture, industrial manufacturing, smart homes, and security systems.

2. Key Features

• Chip Solution: STM32WLE5CCU6, based on ARM Cortex-M4 core.
• Memory: 256KB Flash, 64KB RAM.
• Interfaces: UART, SPI, I²C, GPIO, ADC.
• Protocol Support: LoRaWAN 1.0.3 protocol.
• Frequency Bands: 433MHz (E77-400M22S) and 915MHz (E77-900M22S), supporting ISM band.
• Low Power Consumption: Optimized for energy-efficient operation.
• Compact Size: 14mm x 20mm, easy to integrate into various designs.
• Long Transmission Distance: Up to 5.6km in clear and open environments.
• Strong Anti-interference Performance: Utilizes LoRa spread spectrum technology.
• Industrial Grade Design: Equipped with high-quality components and high-precision crystal oscillators (32.768KHz and 32MHz).
• Open Source Routines: Available for efficient secondary development.
• Multi-platform Compatible: Supports various application scenarios.

3. Specifications

The following table outlines the main parameters and specifications for the EBYTE E77 series modules:

4. Setup and Integration

The E77 series modules are designed for integration into custom hardware. Detailed setup and integration instructions, including pinout diagrams and example schematics, are available for download from the official EBYTE website. It is crucial to follow these guidelines for proper functionality and to avoid damage.

4.1 Power Supply

• The module requires a stable power supply between 1.8V and 3.6V.
• The communication level is 3.3V. If interfacing with 5.0V TTL devices, a level shifter is required to prevent permanent damage to the module.
• Ensure the power supply can provide sufficient current, especially during transmission peaks.

4.2 Antenna Connection

The module features an IPEX/stamp hole for antenna connection. An external 50Ω antenna suitable for the operating frequency (433MHz or 915MHz) must be connected for optimal performance. Ensure a secure connection to minimize signal loss.

4.3 Software Development Environment

To utilize the full capabilities of the STM32WLE5CCU6 chip, users will need to set up a development environment. EBYTE provides open-source routines and auxiliary tools to facilitate secondary development. These resources are essential for configuring the module's parameters, implementing custom firmware, and integrating it into your application.

For detailed information and auxiliary tools, please visit the official EBYTE website download section:

https://www.cdebyte.com/products/E77-900M22S/4#Downloads

5. Operating Instructions

Operating the E77 series module primarily involves programming the STM32WLE5CCU6 microcontroller and utilizing the LoRaWAN protocol for wireless communication. The module supports standard LoRaWAN features and AT commands for configuration.

5.1 LoRaWAN Protocol

The module is equipped with standard LoRaWAN 1.0.3 firmware, supporting EU433/CN470 frequency bands. It supports both CLASS-A and CLASS-C node types, offering high-efficiency receiving frequency bands. Network access methods include ABP (Activation By Personalization) and OTAA (Over-The-Air Activation).

5.2 Programming and AT Commands

Users are expected to develop their own settings for transmit power and communication interfaces. The provided open-source routines will guide you through programming the module. For basic configuration and control, the module supports AT commands. Refer to the detailed documentation available on the EBYTE website for a complete list of commands and their usage.

5.3 Communication Range

The module offers a long communication distance of up to 5.6km under ideal conditions (clear and open environment, maximum power, 3.5dBi antenna gain, 2m height, 1.2kbps air speed). Actual range may vary depending on environmental factors, obstacles, and antenna quality.

5.4 Application Scenarios

The E77 series modules are versatile and can be applied in various IoT solutions:

• Intelligent Agriculture: Accurately monitor conditions, manage operations, and identify potential risks.
• Industrial Manufacturing: Replace signal cables, reduce wiring, and improve efficiency in industrial sites.
• Smart Home: Physical layer technology solution for home IoT, offering good bypass performance and villa-level coverage.
• Hotel Solutions: Support large numbers of access points for unified management.
• Remote Control: Enable long-range control for various devices.
• Security Systems: Provide reliable wireless communication for security applications.

6. Maintenance

The E77 series modules are designed for robust and reliable operation with minimal maintenance. However, adhering to the following guidelines can prolong their lifespan and ensure optimal performance:

• Environmental Conditions: Operate the module within specified temperature and humidity ranges. Avoid extreme conditions.
• Power Supply Stability: Ensure a clean and stable power supply. Voltage fluctuations outside the 1.8V-3.6V range can damage the module.
• Physical Protection: Protect the module from physical shock, vibration, and moisture. If integrated into a larger system, ensure adequate enclosure.
• Antenna Care: Ensure the antenna is securely connected and not damaged. A damaged antenna can degrade performance or even damage the module's RF front end.
• Firmware Updates: Periodically check the EBYTE official website for any firmware updates that may improve performance or add new features.

7. Troubleshooting

If you encounter issues with your E77 series module, consider the following common troubleshooting steps:

• No Power/Module Not Responding:
  • Verify power supply voltage is within 1.8V-3.6V.
  • Check power connections for shorts or open circuits.
  • Ensure correct polarity.
• Communication Failure (UART/SPI/I²C):
  • Check wiring connections to the host microcontroller.
  • Verify communication protocol settings (baud rate, data bits, parity, stop bits).
  • Ensure proper voltage level shifting if interfacing with 5V systems.
• Poor Wireless Range or Connectivity:
  • Check antenna connection and ensure it is suitable for the module's frequency band.
  • Ensure the antenna is not obstructed or placed near metallic objects.
  • Verify transmit power settings in the firmware.
  • Check for environmental interference or obstacles between modules.
  • Confirm LoRaWAN network parameters (frequency, spreading factor, coding rate).
• Module Overheating:
  • Ensure adequate ventilation if the module is enclosed.
  • Check for excessive current draw, possibly due to a short circuit or incorrect configuration.

For more in-depth troubleshooting or specific technical issues, refer to the detailed documentation and application notes available on the EBYTE official website.

8. Warranty and Support

EBYTE provides technical support and resources for its products. For warranty information, detailed technical specifications, application notes, and software development kits, please visit the official EBYTE website.

Official EBYTE Website:

https://www.cdebyte.com/

For specific product downloads related to the E77-900M22S (which also covers the E77-400M22S series), use the following link:

https://www.cdebyte.com/products/E77-900M22S/4#Downloads

This manual provides general guidance. Always refer to the latest official documentation for the most accurate and up-to-date information.

9. Product Video

Watch this video for a visual overview of the E77-400M22S module and its IoT solutions.