1. Introduktion og overview
The EBYTE E32-900M30S is a self-developed, 868/915MHz LoRa SMD wireless module designed for long-distance communication with low power consumption. It is based on the Semtech SX1276 chip, offering excellent anti-interference capabilities and stable communication. This module is suitable for a wide range of applications, including smart home systems, industrial sensors, and security alarms.
Figure 1: E32-900M30S LoRa Module
For detailed technical documentation, please refer to the official user manual PDF: E32-900M30S User Manual PDF.
Video 1: E32-900M30S LoRa Module Product Overview
2. Nøglefunktioner
- LoRa Spread Spectrum-teknologi: Utilizes Semtech SX1276 chip for longer transmission distance, faster transmission speed, and stronger anti-interference ability.
- Wide Frequency Band Support: Operates in the global license-free ISM frequency band, specifically 868/915MHz (working frequency range 850-931MHz).
- Langdistancekommunikation: Achieves a field-tested distance of up to 10km under optimal conditions (clear and open area, antenna gain 5dBi, antenna height 2m, air data rate 2.4kbps).
- Lavt strømforbrug: Forbruger kun 2µA i dyb dvaletilstand, hvilket forlænger batterilevetiden betydeligt.
- Industrial Grade Quality: Designed for stable operation in harsh environments, with an operating temperature range of -40°C to +85°C.
- SPI kommunikationsgrænseflade: Standard SPI interface for easy integration with microcontrollers.
- Compact SMD Package: Small form factor (24mm x 38.5mm) for space-constrained applications.
- Flexible Antenna Options: Supports IPEX and Stamp Hole antenna connections.
Figure 2: Hardware Features
Figure 3: LoRa Spread Spectrum Technology
3. Specifikationer
The following table details the key parameters and specifications of the E32-900M30S LoRa module:
Figure 4: Module Specifications
| Parameter | Min. | Typ. | Maks. | Bemærkninger |
|---|---|---|---|---|
| Strømforsyning voltage (V) | 0 | - | 5.5 | Strøm over 5.5V vil beskadige modulet |
| Blokerende effekt (dBm) | - | - | 10 | Sandsynlighed for nedbrænding på tæt hold |
| Arbejdstemperatur (° C) | -40 | - | 85 | Industriel kvalitet |
| Arbejder voltage (V) | 3.3 | 5 | 5.5 | ≥3.3V sikrer udgangseffekt |
| Kommunikationsniveau (V) | - | 3.3 | - | - |
| Arbejdsfrekvens (MHz) | 850 | 868/915 | 931 | Understøtter ISM frekvensbånd |
| TX strøm (mA) | - | 650 | - | Øjeblikkeligt strømforbrug |
| RX strøm (mA) | - | 19 | - | - |
| Dvalestrøm (µA) | - | 2 | - | Software er slukket |
| Max TX Power (dBm) | - | 30 | - | Se transmissionstilstand for detaljer |
| Modtagelsesfølsomhed (dBm) | -123 | -124 | -125 | Luftdatahastighed er 1.2 kbps |
| Referenceområde | - | 10 km | - | Frit og åbent område, antenneforstærkning 5dBi, antennehøjde 2m, luftdatahastighed 2.4kbps |
| FIFO | 256 byte | - | - | Maksimal længde af enkelt afsendelse |
| Krystaloscillator | - | 32 MHz | - | Passive krystaller |
| Protokol | LoRa (recommended) | - | - | FSK/GFSK/MSK/OOK |
| Pakke | SMD | - | - | Afstand på 2.54 mm |
| Interface | SPI | 2.54 mm samphullet | - | - |
| Kommunikationsgrænseflade | SPI | 0-10Mbps | - | - |
| Størrelse | 24 * 38.5 mm | - | - | - |
| Antenne | IPEX/Stamp Hul | 50 ohm impedans | - | - |
Figur 5: Moduldimensioner
4. Pin -definition
Understanding the pinout is crucial for proper integration of the E32-900M30S module with your microcontroller or system. The module features 28 pins, including power, ground, SPI communication lines, and general-purpose I/O (DIO) pins.
Figure 6: Pin Definition Diagram and Table
| Pin nr. | Punkt | Retning | Beskrivelse |
|---|---|---|---|
| 1 | GND | - | Jord |
| 2 | GND | - | Jord |
| 3 | GND | - | Jord |
| 4 | GND | - | Jord |
| 5 | RXEN | Input | RF switch receiving control pin, connected to external MCU I/O, high level effective |
| 6 | TXEN | Input | RF switch transmitting control pin, connected to external MCU I/O, high level effective |
| 7 | DIO2 | Input/Output | Generel IO-port (se SX1278-manualen for detaljer) |
| 8 | VCC | Strømforsyning, område 3.3 ~ 5.5V (ekstern keramisk filterkondensator anbefales) | |
| 9 | VCC | Strømforsyning, område 3.3 ~ 5.5V (ekstern keramisk filterkondensator anbefales) | |
| 10 | GND | - | Jord |
| 11 | GND | - | Jord |
| 12 | NC | - | Suspendere |
| 13 | DIO3 | Input/Output | Generel IO-port (se SX1278-manualen for detaljer) |
| 14 | DIO4 | Input/Output | Generel IO-port (se SX1278-manualen for detaljer) |
| 15 | DIO5 | Input/Output | Generel IO-port (se SX1278-manualen for detaljer) |
| 16 | GND | - | Jord |
| 17 | GND | - | Jord |
| 18 | DIO0 | Input/Output | Generel IO-port (se SX1278-manualen for detaljer) |
| 19 | DIO1 | Input/Output | Generel IO-port (se SX1278-manualen for detaljer) |
| 20 | NRST | Input | Chip reset trigger input pin |
| 21 | MISO | Produktion | SPI data output pin |
| 22 | Mosi | Input | SPI data input pin |
| 23 | SCLK | Input | SPI ur pin |
| 24 | NSS | Input | The module chip selects the pin used to start an SPI communication |
| 25 | GND | - | Jord |
| 26 | GND | - | Jord |
| 27 | MYRE | - | Antennegrænseflade, Sample hul (50Ω karakteristisk impedans) |
| 28 | GND | - | Jord |
5. Opsætning og installation
The E32-900M30S module is designed for surface-mount (SMD) installation. Careful attention to soldering and power supply is essential.
5.1 Strømforsyning
- Sørg for, at strømforsyningen voltage is within the recommended range of 3.3V to 5.5V. Exceeding 5.5V can permanently damage the module.
- A stable 5V power supply is typically recommended for optimal performance.
- It is advisable to include an external ceramic filter capacitor near the VCC pins for stable power delivery.
5.2 Antenneforbindelse
- Connect a 50-ohm impedance antenna to the ANT pin (Pin 27) or the IPEX connector.
- For best performance, use an antenna specifically designed for the 868/915MHz frequency band.
5.3 SPI Interface Connection
Connect the module to your microcontroller using the SPI interface pins:
- MOSI (Master Out Slave In): Connect to your MCU's MOSI pin.
- MISO (Master In Slave Out): Connect to your MCU's MISO pin.
- SCLK (Serial Clock): Connect to your MCU's SCLK pin.
- NSS (Slave Select): Connect to your MCU's NSS/CS pin to initiate SPI communication.
5.4 General I/O (DIO) Pins
The DIO0, DIO1, DIO2, DIO3, DIO4, and DIO5 pins are general-purpose I/O and their specific functions and usage details can be found in the SX1278 manual (as referenced in the pin definition table).
5.5 Recommended Circuit Diagram
Below is a recommended circuit diagram for integrating the E32-900M30S module with a microcontroller. This diagram provides a visual guide for essential connections.
Figure 7: Recommended Circuit Diagram
6. Betjeningsvejledning
The E32-900M30S module operates using the LoRa protocol via an SPI interface. Programming the module typically involves configuring the SX1276 chip registers through SPI commands.
6.1 Basic Communication Flow
- Initialisering: Configure the module's operating mode (e.g., sleep, standby, transmit, receive), frequency, spreading factor, bandwidth, and coding rate via SPI.
- Smitte: Load data into the module's FIFO buffer via SPI. Set the module to transmit mode. The module will then send the data wirelessly.
- Reception: Set the module to receive mode. When a LoRa packet is detected, the module will signal via a DIO pin (e.g., DIO0 for RxDone interrupt). Read the received data from the FIFO buffer via SPI.
6.2 Strømstyring
To achieve low power consumption, utilize the module's deep sleep mode when not actively transmitting or receiving. The sleep current is approximately 2µA, which is ideal for battery-powered applications.
Figure 8: Low Power Consumption
7. Anvendelsesscenarier
The E32-900M30S LoRa module's long-distance, low-power, and anti-interference characteristics make it suitable for various applications:
- Home security alarm systems
- Industrial sensor networks
- Smart home automation
- Healthcare product monitoring
- Trådløse alarmsystemer
- Bygningsautomationsløsninger
- Data acquisition systems
Figur 9: Applikationsscenarier
8. Brugertips
- Antenneplacering: For optimal range, ensure the antenna is placed in a clear, open area, away from obstructions and metal objects. Antenna height and gain significantly impact communication distance.
- Strømforsyningsstabilitet: Use a regulated power supply to prevent voltage fluctuations that could affect module performance or cause damage.
- Softwarebiblioteker: Consider using existing LoRaWAN or LoRa libraries for your chosen microcontroller to simplify development and ensure correct protocol implementation.
- Interferens: While LoRa has good anti-interference, avoid placing the module near strong electromagnetic interference sources.
9. Fejlfinding
- Ingen kommunikation: Check all wiring connections, especially for the SPI interface (MOSI, MISO, SCLK, NSS) and power supply (VCC, GND). Verify that the module is correctly initialized in your software.
- Dårlig rækkevidde: Ensure the antenna is properly connected and suitable for the 868/915MHz band. Check for obstructions between transceivers. Verify transmit power settings in software.
- Modulet svarer ikke: Kontroller strømforsyningen voltage. Ensure the NRST pin is correctly handled (e.g., pulled high or toggled for reset).
- High Current Consumption: Verify that the module is entering deep sleep mode when intended. Incorrect software configuration can prevent low-power states.
10. Vedligeholdelse
The E32-900M30S LoRa module is a robust electronic component designed for long-term operation. Minimal maintenance is required:
- Miljøforhold: Operate the module within its specified temperature range (-40°C to +85°C) and avoid excessive humidity or corrosive environments.
- Fysisk inspektion: Periodically inspect the module for any signs of physical damage, loose connections, or corrosion, especially in industrial applications.
- Rensning: If necessary, gently clean the module with a soft, dry cloth. Avoid using liquids or abrasive materials.
- Firmwareopdateringer: Keep your microcontroller's firmware updated to ensure compatibility and access to the latest features or bug fixes for the LoRa module's driver.
11. Garanti og support
For warranty information, technical support, and further assistance, please contact EBYTE Official Store directly or visit their official website. Ensure you have your product model number (E32-900M30S) and any relevant purchase details available when seeking support.
