/

/

Component Documentation

How to Use Arduino Ethernet (pre-Rev3): Examples, Pinouts, and Specs

Image of Arduino Ethernet (pre-Rev3)

Design with Arduino Ethernet (pre-Rev3) in Cirkit Designer

Introduction

The Arduino Ethernet (pre-Rev3) is a microcontroller board developed by Arduino, based on the ATmega328 microcontroller. It features an integrated Ethernet controller (WIZnet W5100) that enables network connectivity, making it ideal for Internet of Things (IoT) applications, web-based projects, and remote monitoring systems. This board combines the simplicity of Arduino programming with the power of Ethernet communication, allowing users to create connected devices with ease.

Explore Projects Built with Arduino Ethernet (pre-Rev3)

ESP32 and W5500 Ethernet Module Controlled 8-Channel Relay

Image of ESP32 38Pin 8 Channel Relay USB-C: A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

This circuit enables Ethernet connectivity and device control through an ESP32 microcontroller. It uses the W5500 Ethernet module for network communication and controls an 8-channel relay module for switching external devices or loads.

Open Project in Cirkit Designer

Arduino-Based Multi-Connectivity Interface with Display and Indicators

Image of AP_AGV : AP_TCP(Server) / Bluetooth(Slave) / ModbusRTU(Slave): A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

This circuit features an Arduino UNO R4 WiFi and an Arduino Ethernet board interconnected for combined functionality, possibly for IoT applications. It includes an OLED display and an RS485 to TTL converter for communication, as well as an HC-05 Bluetooth module for wireless data exchange. The circuit also controls several LEDs through resistors, which could be used for status indication, and a DIP switch for input configuration.

Open Project in Cirkit Designer

Arduino Mega 2560 Smart Home System with Ethernet, RFID, and Touchscreen Control

Image of mega ethernet rfid: A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

This circuit integrates an Arduino Mega 2560 with an Ethernet module (W5500), an RFID reader (RC522), and a touchscreen display (ST7796). The Arduino serves as the central controller, managing network communication, RFID scanning, and user interface display.

Open Project in Cirkit Designer

Arduino Nano Weather Station with Ethernet Connectivity

Image of Nano_Sht31_W5500: A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

This circuit features an Arduino Nano microcontroller interfaced with an Ethernet W5500 module for network connectivity and an SHT31 sensor for temperature and humidity measurements. The Arduino Nano communicates with the Ethernet module via SPI and reads data from the SHT31 sensor using I2C, enabling remote monitoring of environmental conditions.

Open Project in Cirkit Designer

Explore Projects Built with Arduino Ethernet (pre-Rev3)

Image of ESP32 38Pin 8 Channel Relay USB-C: A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

ESP32 and W5500 Ethernet Module Controlled 8-Channel Relay

This circuit enables Ethernet connectivity and device control through an ESP32 microcontroller. It uses the W5500 Ethernet module for network communication and controls an 8-channel relay module for switching external devices or loads.

Open Project in Cirkit Designer

Image of AP_AGV : AP_TCP(Server) / Bluetooth(Slave) / ModbusRTU(Slave): A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

Arduino-Based Multi-Connectivity Interface with Display and Indicators

This circuit features an Arduino UNO R4 WiFi and an Arduino Ethernet board interconnected for combined functionality, possibly for IoT applications. It includes an OLED display and an RS485 to TTL converter for communication, as well as an HC-05 Bluetooth module for wireless data exchange. The circuit also controls several LEDs through resistors, which could be used for status indication, and a DIP switch for input configuration.

Open Project in Cirkit Designer

Image of mega ethernet rfid: A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

Arduino Mega 2560 Smart Home System with Ethernet, RFID, and Touchscreen Control

This circuit integrates an Arduino Mega 2560 with an Ethernet module (W5500), an RFID reader (RC522), and a touchscreen display (ST7796). The Arduino serves as the central controller, managing network communication, RFID scanning, and user interface display.

Open Project in Cirkit Designer

Image of Nano_Sht31_W5500: A project utilizing Arduino Ethernet (pre-Rev3) in a practical application

Arduino Nano Weather Station with Ethernet Connectivity

This circuit features an Arduino Nano microcontroller interfaced with an Ethernet W5500 module for network connectivity and an SHT31 sensor for temperature and humidity measurements. The Arduino Nano communicates with the Ethernet module via SPI and reads data from the SHT31 sensor using I2C, enabling remote monitoring of environmental conditions.

Open Project in Cirkit Designer

Common Applications and Use Cases

IoT devices and smart home systems
Web servers for remote control and monitoring
Data logging and transmission over a network
Network-enabled sensors and actuators
Educational projects involving networking and communication

Technical Specifications

Below are the key technical details of the Arduino Ethernet (pre-Rev3):

General Specifications

Parameter	Value
Microcontroller	ATmega328
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limits)	6-20V
Digital I/O Pins	14 (6 PWM outputs)
Analog Input Pins	6
DC Current per I/O Pin	40 mA
Flash Memory	32 KB (2 KB used by bootloader)
SRAM	2 KB
EEPROM	1 KB
Clock Speed	16 MHz
Ethernet Controller	WIZnet W5100
Ethernet Speed	10/100 Mbps
Dimensions	73.2 mm x 53.3 mm

Pin Configuration and Descriptions

The Arduino Ethernet (pre-Rev3) has a standard pinout similar to other Arduino boards, with additional pins for Ethernet functionality.

Digital Pins

Pin Number	Functionality
0 (RX)	Serial Receive (UART)
1 (TX)	Serial Transmit (UART)
2-13	General-purpose digital I/O
3, 5, 6, 9, 10, 11	PWM outputs

Analog Pins

Pin Number	Functionality
A0-A5	Analog inputs (10-bit resolution)

Ethernet-Specific Pins

Pin Number	Functionality
10	Ethernet chip select (CS)
11	SPI MOSI (Master Out Slave In)
12	SPI MISO (Master In Slave Out)
13	SPI SCK (Serial Clock)

Power Pins

Pin Name	Functionality
VIN	Input voltage to the board (7-12V)
5V	Regulated 5V output
3.3V	Regulated 3.3V output
GND	Ground
IOREF	Reference voltage for I/O pins

Usage Instructions

How to Use the Arduino Ethernet (pre-Rev3) in a Circuit

Power the Board: Connect an external power supply (7-12V) to the VIN pin or use the DC barrel jack.
Connect to Ethernet: Plug an Ethernet cable into the RJ45 port on the board.
Program the Board: Use the Arduino IDE to write and upload your sketch via the USB interface.
Use the Ethernet Library: Include the Ethernet.h library in your sketch to enable Ethernet functionality.
Connect Peripherals: Attach sensors, actuators, or other devices to the digital and analog pins as needed.

Important Considerations and Best Practices

Power Supply: Ensure the input voltage is within the recommended range (7-12V) to avoid damaging the board.
Ethernet Shield Compatibility: The Ethernet controller (WIZnet W5100) uses the SPI interface, so avoid conflicts with other SPI devices.
Static IP vs. DHCP: Decide whether to use a static IP address or DHCP for network configuration. DHCP is easier for beginners, but static IPs are useful for fixed network setups.
Shielding: Use a shielded Ethernet cable to minimize interference in noisy environments.

Example Code for Arduino Ethernet

Below is an example sketch to set up a simple web server using the Arduino Ethernet (pre-Rev3):

#include <SPI.h>
#include <Ethernet.h>

// MAC address and IP address for the Ethernet shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 1, 177); // Static IP address
EthernetServer server(80); // Create a server on port 80

void setup() {
  // Start the Ethernet connection
  Ethernet.begin(mac, ip);
  // Start the server
  server.begin();
  Serial.begin(9600);
  Serial.println("Server is ready at http://192.168.1.177/");
}

void loop() {
  // Listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    Serial.println("New client connected");
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c); // Print received data to Serial Monitor

        // Respond to the client with a simple HTML page
        if (c == '\n' && currentLineIsBlank) {
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
          client.println("<h1>Welcome to Arduino Ethernet!</h1>");
          client.println("</html>");
          break;
        }
        if (c == '\n') {
          currentLineIsBlank = true;
        } else if (c != '\r') {
          currentLineIsBlank = false;
        }
      }
    }
    // Give the client time to receive the data
    delay(1);
    client.stop();
    Serial.println("Client disconnected");
  }
}

Troubleshooting and FAQs

Common Issues and Solutions

Ethernet Not Connecting
- Cause: Incorrect MAC or IP address configuration.
- Solution: Double-check the MAC and IP address in your sketch. Ensure the IP address is within your network's range.
Board Not Responding
- Cause: Insufficient power supply.
- Solution: Use a power supply within the recommended range (7-12V).
SPI Conflicts
- Cause: Multiple SPI devices using the same pins.
- Solution: Ensure only one device is active on the SPI bus at a time. Use separate chip select (CS) pins for each device.
Slow Network Performance
- Cause: High network traffic or poor cable quality.
- Solution: Use a shielded Ethernet cable and minimize network congestion.

FAQs

Q: Can I use the Arduino Ethernet (pre-Rev3) with PoE (Power over Ethernet)?
A: No, the pre-Rev3 version does not support PoE. You will need an external power supply.

Q: Is the Arduino Ethernet compatible with the Arduino Uno shields?
A: Yes, the Arduino Ethernet has the same form factor as the Arduino Uno and is compatible with most Uno shields.

Q: How do I reset the Ethernet connection?
A: Call Ethernet.begin(mac, ip) again in your sketch to reinitialize the Ethernet connection.

Q: Can I use DHCP instead of a static IP?
A: Yes, replace Ethernet.begin(mac, ip) with Ethernet.begin(mac) to use DHCP.