ESP8266 เป็นเว็บเซิฟเวอร์ สร้างลิงค์กดปุ่ม 4 ปุ่ม Refresh
อุปกรณ์
1. บอร์ด esp8266
2. เครื่องคอมพิวเตอร์
3. สายเชื่อมต่อ usb หรือสำหรับอัพโหลดโปรแกรมและจ่ายพลังงาน
4. Relay 4 channel
ขั้นตอนที่ 1:เชื่อมต่อกับ Relay ให้ครบ 4 ขา
ESP8266 -> Relay 4 channel
3V -> VCC
D1(GPIO5) -> In1
D2(GPIO4) -> In2
D5(GPIO14)-> In3
D6(GPIO12)-> In4
GND -> GND
สร้างปุ่มอัพเดทสถานะของรีเลย์ กรณี มีการใช้งานจากหลายแห่ง
client.println("<p><a href=\"/\"><button class=\"button button2\">Refresh</button></a></p>");
client.println("</body></html>")
/// complete code
// Load Wi-Fi library
#include <ESP8266WiFi.h>
// Replace with your network credentials
const char* ssid = "Nui 2.4G";
const char* password = "0895515998";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Auxiliar variables to store the current output state
String r1State = "off";
String r2State = "off";
String r3State = "off";
String r4State = "off";
// Assign output variables to GPIO pins
const int r1 = 5; // In1
const int r2 = 4; // In2
const int r3 = 14; // In3
const int r4 = 12; // In4
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;
void setup() {
Serial.begin(115200);
// Initialize the output variables as outputs
pinMode(r1, OUTPUT);
pinMode(r2, OUTPUT);
pinMode(r3, OUTPUT);
pinMode(r4, OUTPUT);
// Set outputs to HIGH
digitalWrite(r1, HIGH);
digitalWrite(r2, HIGH);
digitalWrite(r3, HIGH);
digitalWrite(r4, HIGH);
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
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());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
currentTime = millis();
previousTime = currentTime;
while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
currentTime = millis();
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 /1/on") >= 0) {
Serial.println("GPIO 5 on");
r1State = "on";
r2State = "off";
r3State = "off";
r4State = "off";
digitalWrite(r1, LOW);
digitalWrite(r2, HIGH);
digitalWrite(r3, HIGH);
digitalWrite(r4, HIGH);
} else if (header.indexOf("GET /1/off") >= 0) {
Serial.println("Relay 1 off");
r1State = "off";
digitalWrite(r1, HIGH);
} else if (header.indexOf("GET /2/on") >= 0) {
Serial.println("Relay 2 on");
r2State = "on";
r1State = "off";
r3State = "off";
r4State = "off";
digitalWrite(r2, LOW);
digitalWrite(r1, HIGH);
digitalWrite(r3, HIGH);
digitalWrite(r4, HIGH);
} else if (header.indexOf("GET /2/off") >= 0) {
Serial.println("Relay 2off");
r2State = "off";
digitalWrite(r2, HIGH);
} else if (header.indexOf("GET /3/on") >= 0) {
Serial.println("Relay 3 on");
r3State = "on";
r1State = "off";
r2State = "off";
r4State = "off";
digitalWrite(r3, LOW);
digitalWrite(r1, HIGH);
digitalWrite(r2, HIGH);
digitalWrite(r4, HIGH);
} else if (header.indexOf("GET /3/off") >= 0) {
Serial.println("Relay 3 off");
r3State = "off";
digitalWrite(r3, HIGH);
} else if (header.indexOf("GET /4/on") >= 0) {
Serial.println("Relay 4 on");
r4State = "on";
r1State = "off";
r2State = "off";
r3State = "off";
digitalWrite(r4, LOW);
digitalWrite(r1, HIGH);
digitalWrite(r2, HIGH);
digitalWrite(r3, HIGH);
} else if (header.indexOf("GET /4/off") >= 0) {
Serial.println("Relay 4 off");
r4State = "off";
digitalWrite(r4, HIGH);
}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
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: #78909c; border: none; color: white; padding: 12px 20px;");
client.println("text-decoration: none; font-size: 30px; margin: 1px; cursor: pointer;}");
client.println(".button2 {background-color: #4caf50;}</style></head>");
// Web Page Heading
client.println("<body><h1>ESP8266 Web Server</h1>");
// Display current state, and ON/OFF buttons for GPIO 5
client.println("<p>Relay 1 " + r1State + "</p>");
// If the output5State is off, it displays the ON button
if (r1State=="off") {
client.println("<a href=\"/1/on\"><button class=\"button\">ON</button></a>");
} else {
client.println("<a href=\"/1/off\"><button class=\"button button2\">OFF</button></a>");
}
// Display current state, and ON/OFF buttons for GPIO 4
client.println("<p>Relay 2 " + r2State + "</p>");
// If the output4State is off, it displays the ON button
if (r2State=="off") {
client.println("<p><a href=\"/2/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/2/off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 14
client.println("<p>Relay 3 " + r3State + "</p>");
// If the output14State is off, it displays the ON button
if (r3State=="off") {
client.println("<p><a href=\"/3/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/3/off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 12
client.println("<p>Relay 4 " + r4State + "</p>");
// If the output12State is off, it displays the ON button
if (r4State=="off") {
client.println("<p><a href=\"/4/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/4/off\"><button class=\"button button2\">OFF</button></a></p>");
}
client.println("<p><a href=\"/\"><button class=\"button button2\">Refresh</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("");
}
}
/////////////////////////////////////////////////
Relate:
https://randomnerdtutorials.com/esp8266-web-server/
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