Nodemcu+ESP8266实现WEB控制家用电器

一，教程目的

通过Nodemcu+ESP8266通过网页去控制继电器以及灯泡。

二，实验环境

操作系统： windows10
硬件： ESP8266开发板 x1（CP2102）需要下载CP2102驱动点我下载
继电器： 1路5V低电平触发 x1
面包板： 随便都行
杜邦线若干： 一般买面包板送线

三，物品清单

四，硬件连接

1.继电器上的VCCVCC可以理解为正极接入，连接板子上的3V33V3是3.3V供电，将继电器上的GNDGND是负极，连接板子上的GND，将继电器上的ININ可理解为信号控制，连接板子上的D1，接线法看图。

2.将继电器上的COM，连接板子上其他3V3口，将继电器上的NC连接LED灯上的正极（如果要控制家用电器，请将COM接火线NC接零线，如果要在之间加电器请在零线上加）再将板子上的GND接LED的负极，接线法看图。

公共触点：COM
常开触点：NC
请勿接错

继电器接线图：


不懂面包板的朋友请看面包板后面就懂面包板怎么用了
3.将第二个小灯泡的正极接板子的D2,负极接板子的GND，接线法看图。

五，Arduino的esp8266的配置

1.打开Arduino-文件-首选项，开发板管理填http://arduino.esp8266.com/stable/package_esp8266com_index.json

2.工具-开发板-开发板管理

搜索esp8266

安装上去

六，开始写代码

#include 

// Add wifi access point credentiaals
const char* ssid     = "这里填你家WIFI名称";
const char* password = "这里填你家WIFI密码";

WiFiServer server(80);// Set port to 80


String header; // This storees the HTTP request

// Declare the pins to which the LEDs are connected 
int inD1 = D1;
int inD2 = D2; 

String D1state = "关";// state of green LED
String D2state = "关";// state of red LED


void setup() {
  Serial.begin(115200);
 // Set the pinmode of the pins to which the LEDs are connected and turn them low to prevent flunctuations
  pinMode(inD1, OUTPUT);
  pinMode(inD2, OUTPUT);
  digitalWrite(inD1, LOW);
  digitalWrite(inD2, LOW);
  //connect to access point
  WiFi.begin(ssid, password);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());// this will display the Ip address of the Pi which should be entered into your browser
  server.begin();
}

void loop(){
  WiFiClient client = server.available();   // Listen for incoming clients

  if (client) {                             // If a new client connects,
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();
            
            // turns the GPIOs on and off
            if (header.indexOf("GET /D1/on") >= 0) {
              Serial.println("D1 开");
              D1state = "开";
              digitalWrite(inD1, HIGH);
            } else if (header.indexOf("GET /D1/off") >= 0) {
              Serial.println("D1 关");
              D1state = "关";
              digitalWrite(inD1, LOW);
            } else if (header.indexOf("GET /D2/on") >= 0) {
              Serial.println("D2 开");
              D2state = "开";
              digitalWrite(inD2, HIGH);
            } else if (header.indexOf("GET /D2/off") >= 0) {
              Serial.println("D2 关");
              D2state = "关";
              digitalWrite(inD2, LOW);
            }
       
            // Display the HTML web page
            client.println("");
            client.println("");
          
            client.println("");
            // CSS to style the on/off buttons 
            // Feel free to change the background-color and font-size attributes to fit your preferences
            client.println("");
            
            // Web Page Heading
            client.println("
nodemcu 网页测试 BY:southwind QQ:511114355
");
            
            // Display current state, and ON/OFF buttons for GPIO 5  
            client.println("
D1 - 信息 " + D1state + "
");
            // If the green LED is off, it displays the ON button       
            if (D1state == "关") {
              client.println("
开
");
            } else {
              client.println("
关
");
            } 
               
            // Display current state, and ON/OFF buttons for GPIO 4  
            client.println("
D2 - 信息 " + D2state + "
");
            // If the red LED is off, it displays the ON button       
            if (D2state == "关") {
              client.println("
开
");
            } else {
              client.println("
关
");
            }
            client.println("");
            
            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}

七，烧录进开发板

点击Arduino的上传

代码上传完后访问esp8266的IP

八，效果演示

在路由器管理中已经可以看见ESP8266的ip了

我们在浏览器中输入：192.168.4.103，并打开串口监视器查看信息

我们看看Arduino的串口监视器

我们去打开D1上的继电器看看效果


LED可以正常亮起，我们吧D2口上的LED也打开

正常亮起。

九，总结

不可把开发板上的接口直接去接上家庭电器，因为家庭电器220V，板子承受不了，若要接家庭电器，请在继电器上接，红线接COM，零线接NC。