How to Use Waveshare TTL-ETH: Examples, Pinouts, and Specs

The Waveshare TTL-ETH (Manufacturer Part ID: 24276) is a TTL to Ethernet module designed to enable serial communication over an Ethernet network. This module is ideal for applications requiring reliable and fast data transmission between microcontrollers and Ethernet-based systems. It simplifies the process of connecting embedded devices to the internet, making it a versatile choice for IoT projects, industrial automation, and remote monitoring systems.

• Internet of Things (IoT) devices
• Remote data logging and monitoring
• Industrial automation and control systems
• Home automation projects
• Serial-to-Ethernet communication for microcontrollers

The following table outlines the key technical details of the Waveshare TTL-ETH module:

The Waveshare TTL-ETH module has a 7-pin interface. The pin configuration is as follows:

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to ground.
2. UART Communication: Connect the TXD pin of the module to the RX pin of your microcontroller and the RXD pin to the TX pin of your microcontroller.
3. Ethernet Connection: Plug an Ethernet cable into the RJ45 port of the module to establish a network connection.
4. Configuration Mode: To configure the module, pull the CFG pin low during power-up. Use the provided configuration software or send AT commands via UART to set parameters such as IP address, baud rate, and communication mode.
5. Reset: Use the RST pin to reset the module if needed.

• Ensure the power supply voltage is within the specified range (3.3V to 5V) to avoid damaging the module.
• Use a level shifter if your microcontroller operates at 1.8V or 2.5V logic levels, as the module operates at TTL levels (3.3V or 5V).
• Keep the Ethernet cable length within the recommended range for reliable communication (typically less than 100 meters for CAT5e or CAT6 cables).
• Avoid placing the module near high-frequency noise sources to maintain signal integrity.

Below is an example of how to use the Waveshare TTL-ETH module with an Arduino UNO to send data over Ethernet.

• Connect VCC to the 5V pin of the Arduino.
• Connect GND to the GND pin of the Arduino.
• Connect TXD to the Arduino's RX (pin 0).
• Connect RXD to the Arduino's TX (pin 1).
• Connect an Ethernet cable to the module's RJ45 port.

#include <SoftwareSerial.h>

// Define RX and TX pins for software serial communication
SoftwareSerial ethSerial(10, 11); // RX = pin 10, TX = pin 11

void setup() {
  // Initialize serial communication with the module
  Serial.begin(9600); // For debugging via Serial Monitor
  ethSerial.begin(9600); // Communication with TTL-ETH module

  Serial.println("Waveshare TTL-ETH Module Test");
  ethSerial.println("Hello, Ethernet!"); // Send data to the module
}

void loop() {
  // Check if data is available from the module
  if (ethSerial.available()) {
    String data = ethSerial.readString();
    Serial.print("Received from Ethernet: ");
    Serial.println(data); // Print received data to Serial Monitor
  }

  // Check if data is available from Serial Monitor
  if (Serial.available()) {
    String data = Serial.readString();
    ethSerial.print(data); // Send data to the Ethernet module
  }
}

1. No Ethernet Connection Detected:

   • Ensure the Ethernet cable is securely connected to the module and the network.
   • Verify that the LINK pin is high, indicating an active Ethernet connection.
   • Check the network configuration (IP address, subnet mask, etc.) using the configuration software.

2. No Data Transmission:

   • Verify the UART connections (TXD and RXD) between the module and the microcontroller.
   • Ensure the baud rate of the module matches the baud rate set in your microcontroller code.
   • Check for any loose or incorrect wiring.

3. Module Not Entering Configuration Mode:

   • Ensure the CFG pin is pulled low during power-up.
   • Verify the power supply voltage is stable and within the specified range.

4. Module Not Responding to Commands:

   • Reset the module using the RST pin and try again.
   • Confirm that the module is powered on and the UART connections are correct.

Q: Can the module operate at 1.8V logic levels?
A: No, the module operates at TTL levels (3.3V or 5V). Use a level shifter for compatibility with 1.8V systems.

Q: What is the maximum baud rate supported by the module?
A: The module supports baud rates up to 115200 bps.

Q: Can I use the module with a Raspberry Pi?
A: Yes, the module can be used with a Raspberry Pi. Connect the UART pins to the Raspberry Pi's GPIO pins and configure the serial port accordingly.

Q: How do I update the firmware of the module?
A: Refer to the manufacturer's documentation for firmware update instructions, as this process may require specific tools or software.

Q: Is the module compatible with DHCP?
A: Yes, the module supports both static IP and DHCP configurations. Use the configuration software or AT commands to enable DHCP.