查看: 14 | 回复: 0

发表于: 昨天 17:40 | 显示全部楼层

您对以太网通信感兴趣吗？在本篇帖子中，我们将使用ENC28J60模块和Arduino开发板探索以太网通信的世界。无论您是初学者还是经验丰富的Arduino爱好者，这都将对您有所帮助。在本文中，我们将学习如何连接ENC28J60模块，并提供分步说明和要点。通过简单的说明和实际示例，我们将学习如何建立TCP/IP 连接、发送和接收数据以及使用ENC28J60模块创建我们自己的Web服务器。

所需的组件

● Arduino Micro开发板

● ENC28J60以太网网络模块

● 公/母跳线

ENC28J60以太网模块的引脚排列

该模块配备ENC28J60 以太网网络控制器，支持各种网络协议。由于具有SPI接口，它可以轻松与微控制器通信。该芯片的最大数据传输速度为10Mbps，足以满足许多应用的需求。该模块有10个引脚，如下图所示。

使用Arduino和ENC28J60模块创建Web服务器的硬件连接

按如下所示连接各个组件，将Arduino开发板的SPI引脚连接到以太网模块的SPI引脚。

注意：ENC28J60以太网模块的电源电压必须为3.3V。更高的电压可能会烧毁芯片。

Web服务器代码

在开始编写代码之前，首先从此链接下载EthernetENC库并将其安装在Arduino软件中。

现在让我们开始编写Web服务器代码。通过此代码，Arduino读取6个模拟输入并以特定格式显示在Web服务器页面上。

/*
modified on OCT 23, 2023
Modified by MajidMerati from Arduino Examples
*/
#include <SPI.h>
#include <EthernetENC.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 6, 101);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
void setup() {
// You can use Ethernet.init(pin) to configure the CS pin
//Ethernet.init(10); // Most Arduino shields
//Ethernet.init(5); // MKR ETH shield
//Ethernet.init(0); // Teensy 2.0
//Ethernet.init(20); // Teensy++ 2.0
//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.println("Ethernet WebServer Example");
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
// Check for Ethernet hardware present
if (Ethernet.hardwareStatus() == EthernetNoHardware) {
Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
while (true) {
delay(1); // do nothing, no point running without Ethernet hardware
}
}
if (Ethernet.linkStatus() == LinkOFF) {
Serial.println("Ethernet cable is not connected.");
}
// start the server
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a new line
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
// output the value of each analog input pin
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is ");
client.print(sensorReading);
client.println("<br />");
}
client.println("</html>");
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}