How to Use E22-900M30S: Examples, Pinouts, and Specs

The E22-900M30S is a high-performance RF module manufactured by EBYTE. It is designed for wireless communication applications and operates in the 900 MHz frequency band. This module is ideal for low-power, long-range data transmission, making it a popular choice for IoT devices, remote sensor networks, and industrial automation systems.

• Internet of Things (IoT) devices
• Remote monitoring and control systems
• Wireless sensor networks
• Smart agriculture and environmental monitoring
• Industrial automation and telemetry

The E22-900M30S module has 16 pins. Below is the pinout and description:

1. Power Supply: Connect the VCC pin to a stable power source (2.8V to 5.5V) and the GND pin to ground.
2. UART Communication: Connect the RXD and TXD pins to the corresponding TXD and RXD pins of your microcontroller.
3. Mode Selection: Use the M0 and M1 pins to configure the module's operating mode:
   • Mode 0 (Normal): M0 = 0, M1 = 0
   • Mode 1 (Wake-up): M0 = 1, M1 = 0
   • Mode 2 (Power-saving): M0 = 0, M1 = 1
   • Mode 3 (Sleep): M0 = 1, M1 = 1
4. AUX Pin: Monitor the AUX pin to check the module's status. For example, a high signal indicates the module is idle, while a low signal indicates it is busy.
5. Configuration: Use the SET pin to configure parameters such as frequency, data rate, and transmission power. This can be done via AT commands or a dedicated configuration tool.

Below is an example of how to connect the E22-900M30S to an Arduino UNO and send data.

#include <SoftwareSerial.h>

// Define pins for SoftwareSerial
#define E22_TX 2  // Connect to TXD of E22-900M30S
#define E22_RX 3  // Connect to RXD of E22-900M30S
#define M0_PIN 4  // Connect to M0 of E22-900M30S
#define M1_PIN 5  // Connect to M1 of E22-900M30S
#define AUX_PIN 6 // Connect to AUX of E22-900M30S

SoftwareSerial E22Serial(E22_RX, E22_TX);

void setup() {
  // Initialize serial communication
  Serial.begin(9600);       // For debugging
  E22Serial.begin(9600);    // Communication with E22-900M30S

  // Configure mode pins
  pinMode(M0_PIN, OUTPUT);
  pinMode(M1_PIN, OUTPUT);
  pinMode(AUX_PIN, INPUT);

  // Set module to Normal mode (M0 = 0, M1 = 0)
  digitalWrite(M0_PIN, LOW);
  digitalWrite(M1_PIN, LOW);

  Serial.println("E22-900M30S Initialized");
}

void loop() {
  // Send data to the E22 module
  E22Serial.println("Hello, E22-900M30S!");

  // Wait for the module to process the data
  delay(1000);

  // Check for incoming data
  if (E22Serial.available()) {
    String receivedData = E22Serial.readString();
    Serial.print("Received: ");
    Serial.println(receivedData);
  }

  delay(2000); // Delay between transmissions
}

• Voltage Levels: The E22-900M30S operates at 3.3V logic levels. If using a 5V microcontroller (e.g., Arduino UNO), use a voltage divider or level shifter for the RXD pin.
• Antenna: Ensure a proper 900 MHz antenna is connected to the module for optimal performance.
• Distance: The maximum communication range (10 km) is achievable only in line-of-sight conditions with minimal interference.

1. No Communication Between Devices

   • Ensure the RXD and TXD pins are correctly connected.
   • Verify that both modules are configured with the same frequency, data rate, and other parameters.

2. Short Communication Range

   • Check the antenna connection and ensure it is suitable for the 900 MHz band.
   • Avoid obstacles and interference sources between the transmitter and receiver.

3. Module Not Responding

   • Verify the power supply voltage (2.8V to 5.5V).
   • Check the AUX pin to ensure the module is not busy.

4. Data Corruption

   • Ensure the baud rate of the microcontroller matches the module's UART baud rate.
   • Use shielded cables to reduce electromagnetic interference.

Q: Can I use the E22-900M30S with a 5V microcontroller?
A: Yes, but you must use a voltage divider or level shifter for the RXD pin to avoid damaging the module.

Q: How do I configure the module's parameters?
A: Parameters can be configured using AT commands via UART or a dedicated configuration tool provided by EBYTE.

Q: What is the maximum data rate of the module?
A: The maximum data rate is 19.2 kbps, which is suitable for low-power, long-range applications.