//********************************************************** #include #include //include library code //*********************************************************** Servo servo2; //create servo object to control a servo const int servoPin = 14;//the servo is attached to ESP32 GPIO 14 //replace with your network credentials const char* ssid = "TR-2"; const char* password = "AQW112_jkh1256*/_;&%_128DF"; // Set web server port number to 80 WiFiServer server(80); String header;//variable to store the HTTP request //decode HTTP GET value String valueString = String(5); int pos1 = 0; int pos2 = 0; //************************************************************** void setup() { Serial.begin(115200);//initialise serial communication at 115200 bps servo2.attach(servoPin); // attaches the servo on the servoPin to the servo object Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.print("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 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(); // 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(""); client.println(""); // Web Page client.println("

ESP32 development board with Servo motor

"); client.println("

Shaft position: degrees

"); client.println(""); client.println(""); client.println(""); //GET /?value=180& HTTP/1.1 if (header.indexOf("GET /?value=") >= 0) { pos1 = header.indexOf('='); pos2 = header.indexOf('&'); valueString = header.substring(pos1 + 1, pos2); //Rotate the servo servo2.write(valueString.toInt()); Serial.println(valueString); } // 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(""); } }