ESP8266 wemos WIFIWebServer 例子

最新推荐文章于 2024-09-11 09:15:27 发布

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本文介绍了一个使用ESP8266模块搭建的简易HTTP服务器实例。该服务器能够根据HTTP请求设置GPIO状态，通过连接到指定Wi-Fi网络并监听80端口接收请求，实现对GPIO2高低电平的控制。

开发环境：
这里写图片描述

代码如下：

/*
 *  This sketch demonstrates how to set up a simple HTTP-like server.
 *  The server will set a GPIO pin depending on the request
 *    http://server_ip/gpio/0 will set the GPIO2 low,
 *    http://server_ip/gpio/1 will set the GPIO2 high
 *  server_ip is the IP address of the ESP8266 module, will be 
 *  printed to Serial when the module is connected.
 */

#include <ESP8266WiFi.h>

const char* ssid = "HelloWifi";
const char* password = "123ab";

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  delay(10);

  // prepare GPIO2
  pinMode(2, OUTPUT);
  digitalWrite(2, 0);

  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected AAAA");

  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.println(WiFi.localIP());
}

void loop() {
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
    return;
  }

  // Wait until the client sends some data
  Serial.println("new client");
  while(!client.available()){
    delay(1);
  }

  // Read the first line of the request
  String req = client.readStringUntil('\r');
  Serial.println(req);
  client.flush();

  // Match the request
  int val;
  if (req.indexOf("/gpio/0") != -1)
    val = 0;
  else if (req.indexOf("/gpio/1") != -1)
    val = 1;
  else {
    Serial.println("invalid request");
    client.stop();
    return;
  }

  // Set GPIO2 according to the request
  digitalWrite(2, val);

  client.flush();
  Serial.println("Hello \r\n");
  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now ";
  s += (val)?"high":"low";
  s += "</html>\n";

  // Send the response to the client
  client.print(s);
  delay(1);
  Serial.println("Client disonnected");

  // The client will actually be disconnected 
  // when the function returns and 'client' object is detroyed
}

log:

Connecting to HelloWifi
scandone
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3

connected with HelloWifi, channel 1
dhcp client start...
cnt 
.......ip:192.168.0.103,mask:255.255.255.0,gw:192.168.0.1
.
WiFi connected AAAA
Server started
192.168.0.103
pm open,type:2 0
new client
GET /gpio/0 HTTP/1.1
Hello 

Client disonnected
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /gpio/1 HTTP/1.1
Hello 

Client disonnected
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /gpio/0 HTTP/1.1
Hello 

Client disonnected
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /favicon.ico HTTP/1.1
invalid request
new client
GET /favicon.ico HTTP/1.1
invalid request

操作效果：

这里写图片描述