Example Code for Arduino-WIFI control LED

Hardware Preparation

• DFR0868 Beetle ESP32-C3 x 1

Software Preparation

• Download Arduino IDE: Click to download Arduino IDE
• Add ESP32 board to Arduino IDE

Steps

1. Connect to WIFI "Beetle ESP32 C3", WIFI password has been set: 12345678
2. Visit the website http://192.168.4.1/ON to turn on the light. Visit http://192.168.4.1/OFF to turn off the light
3. After the visit, click the up and down to conveniently control the on and off of the light without entering the URL.

Sample Code

/*
Steps：
1. Connect to WIFI "Beetle ESP32 C3", WIFI password has been set: 12345678
2. Visit the website http://192.168.4.1/ON to turn on the light; Visit http://192.168.4.1/OFF to turn off the light
3. After the visit, click the up and down to conveniently control the on and off of the light without entering the URL.
*/

#include <WiFi.h>
#include <WiFiClient.h>
#include <WiFiAP.h>

#define myLED 10 //Set pin 10 as LED pin
// Set WIFI name and password
const char *ssid = "Beetle ESP32 C3";//WIFI name
const char *password = "12345678";//password

WiFiServer server(80);//The default web service port is 80


void setup() {
  pinMode(myLED, OUTPUT);

  Serial.begin(115200);
  Serial.println();
  Serial.println("Configuring access point...");

  //If you want to open the network without a password, please delete the password
  WiFi.softAP(ssid, password);
  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.begin();

  Serial.println("Server started");
}

void loop() {
  WiFiClient client = server.available();   // detect waiting for connection

  if (client) {                             // check if connected
    Serial.println("New Client.");
    String currentLine = "";                // create String variable to save the data
    while (client.connected()) {            // keep looping while keeping the connection
      if (client.available()) {             // check if the connection has data
        char c = client.read();             // read received data
        //Serial.write(c);                    // print on serial monitor
        if (c == '\n') {                    // if newline is read

          //end with a newline reminder
          if (currentLine.length() == 0) {
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println();
             //connect characters with here
            client.print("Click <a href=\"/ON\">here</a> to turn ON the LED.<br>");
            client.print("Click <a href=\"/OFF\">here</a> to turn OFF the LED.<br>");

            // HTTP response is blank
            client.println();
            // Break out of the loop
            break;
          } else {    // Clear variable cached data if there is a newline
            currentLine = "";
          }
        } else if (c != '\r') {  // If you get characters other than carriage return
          currentLine += c;      // The obtained character is added to the end of the variable
        }

        // Check to see if /ON or /OFF
        if (currentLine.endsWith("/ON")) {
          digitalWrite(myLED, HIGH);               //Turn on the light when getting /ON
        }
        if (currentLine.endsWith("/OFF")) {
          digitalWrite(myLED, LOW);                //Turn off the light when getting /OFF
        }
      }
    }
    // Disconnect
    client.stop();
    Serial.println("Client Disconnected.");
  }
}

Result

Use the mobile phone to connect to this wifi, access 192.168.4.1 through the browser, as shown in the figure, the ip address is 192.168.4.1, and the service is enabled.

Use a browser to access the ip address and get it as shown below

Try clicking the links separately to control the LEDs

Member function

• WiFiServer server()
  
  Description: Set the server port

• softAP(ssid,password)
  
  Description: Configure WiFi as AP mode, and set the name and password
  
  Parameter:

• ssid: wifi name in AP mode

• password: wifi password in ap mode

• server.available()
  
  Description: Check whether the service port is connected (whether WIFI is connected)

• client.connected()
  
  Description: Check connection status
  
  Return value: true/false

• client.available()
  
  Description: Detect whether there is data input connected to WIFI

• client.read()
  
  Description: Read WIFI received data

• currentLine.endsWith()
  
  Description: Check whether the bracket content is obtained

• client.stop()
  
  Description: Disconnect