Nodemcu+ESP8266实现WEB控制家用电器
作者：互联网
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 <ESP8266WiFi.h>
// 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("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width,initial-scale=1\" charset=\"utf-8\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #77878A;}</style></head>");
// Web Page Heading
client.println("<body><h1>nodemcu 网页测试 BY:southwind QQ:511114355</h1>");
// Display current state, and ON/OFF buttons for GPIO 5
client.println("<p>D1 - 信息 " + D1state + "</p>");
// If the green LED is off, it displays the ON button
if (D1state == "关") {
client.println("<p><a href=\"/D1/on\"><button class=\"button\">开</button></a></p>");
} else {
client.println("<p><a href=\"/D1/off\"><button class=\"button button2\">关</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 4
client.println("<p>D2 - 信息 " + D2state + "</p>");
// If the red LED is off, it displays the ON button
if (D2state == "关") {
client.println("<p><a href=\"/D2/on\"><button class=\"button\">开</button></a></p>");
} else {
client.println("<p><a href=\"/D2/off\"><button class=\"button button2\">关</button></a></p>");
}
client.println("</body></html>");
// 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。
标签：WEB,LED,ESP8266,继电器,else,Nodemcu,client,println,Serial 来源： https://blog.csdn.net/qq_41181921/article/details/106610976