1. Introducció
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. Característiques clau
- Solució de xip: STM32WLE5CCU6, based on ARM Cortex-M4 core.
- Memòria: 256KB Flash, 64KB RAM.
- Interfícies: UART, SPI, I²C, GPIO, ADC.
- Suport al protocol: LoRaWAN 1.0.3 protocol.
- Bandes de freqüència: 433MHz (E77-400M22S) and 915MHz (E77-900M22S), supporting ISM band.
- Baix consum d'energia: Optimized for energy-efficient operation.
- Mida compacta: 14mm x 20mm, easy to integrate into various designs.
- Llarga distància de transmissió: Up to 5.6km in clear and open environments.
- Strong Anti-interference Performance: Utilizes LoRa spread spectrum technology.
- Disseny de grau industrial: Equipped with high-quality components and high-precision crystal oscillators (32.768KHz and 32MHz).
- Rutines de codi obert: Available for efficient secondary development.
- Compatible amb diverses plataformes: Supports various application scenarios.
3. Especificacions
The following table outlines the main parameters and specifications for the EBYTE E77 series modules:
| Paràmetre principal | Rendiment | Observació |
|---|---|---|
| Freqüència de treball | 410/510MHz (E77-400M22S) / 850/930MHz (E77-900M22S) | Suport a la banda ISM |
| Transmissió de potència | 0 ~ 21.5 dBm | Programari ajustable, els usuaris han de desenvolupar la seva pròpia configuració |
| Rebre sensibilitat | -118 dBm | GFSK, velocitat de l'aire 1.2 kbps |
| Distància mesurada | 5600 m | Clear and open environment, maximum power, antenna gain 3.5dBi, height 2m, airspeed 1.2kbps |
| Nom complet IC | STM32WLE5CCU6 | — |
| Tipus d'antena | IPEX/stamp forat | Impedància equivalent aprox. 50 Ω |
| Interfície de comunicació | UART, SPI, I²C, GPIO, ADC | Els usuaris han de desenvolupar la seva pròpia configuració |
| Embalatge | Pegat stamp forat | — |
| Voltage | 1.8~3.6V | ≥3.3V Potència de sortida garantida. Superar els 3.6V cremarà permanentment el mòdul. |
| Nivell de comunicació | 3.3 V | Es recomana utilitzar 5.0 V TTL per afegir una conversió de nivell |
| FLASH | 256 KB | — |
| RAM | 64 KB | — |
4. Configuració i integració
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 Font d'alimentació
- 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 Connexió de l'antena
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. Instruccions de funcionament
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 Abast de comunicació
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 Escenaris d'aplicació
The E77 series modules are versatile and can be applied in various IoT solutions:
- Agricultura intel·ligent: Accurately monitor conditions, manage operations, and identify potential risks.
- Fabricació industrial: Replace signal cables, reduce wiring, and improve efficiency in industrial sites.
- Casa intel·ligent: Solució tecnològica de capa física per a la IoT domèstica, que ofereix un bon rendiment de bypass i cobertura a nivell de vil·la.
- Solucions hoteleres: Support large numbers of access points for unified management.
- Comandament a distància: Enable long-range control for various devices.
- Sistemes de seguretat: Provide reliable wireless communication for security applications.
6. Manteniment
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:
- Condicions ambientals: Operate the module within specified temperature and humidity ranges. Avoid extreme conditions.
- Estabilitat de la font d'alimentació: Assegureu-vos d'un subministrament d'alimentació net i estable. Vol.tage fluctuations outside the 1.8V-3.6V range can damage the module.
- Protecció física: Protect the module from physical shock, vibration, and moisture. If integrated into a larger system, ensure adequate enclosure.
- Cura de l'antena: Ensure the antenna is securely connected and not damaged. A damaged antenna can degrade performance or even damage the module's RF front end.
- Actualitzacions de firmware: Consulteu periòdicament el registre oficial d'EBYTE website for any firmware updates that may improve performance or add new features.
7. Solució De Problemes
If you encounter issues with your E77 series module, consider the following common troubleshooting steps:
- Sense alimentació/El mòdul no respon:
- Comproveu la font d'alimentació voltage està entre 1.8V i 3.6V.
- Check power connections for shorts or open circuits.
- Assegureu-vos de la polaritat correcta.
- Communication Failure (UART/SPI/I²C):
- Check wiring connections to the host microcontroller.
- Verify communication protocol settings (baud rate, data bits, parity, stop bits).
- Assegureu-vos el volum adequattage 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).
- Sobreescalfament del mòdul:
- 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 weblloc.
8. Garantia i Suport
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 weblloc.
Official EBYTE Weblloc:
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. Vídeo del producte
Mireu aquest vídeo per obtenir una visió generalview of the E77-400M22S module and its IoT solutions.
