Arduino ESP32 Web服务器控制舵机

2021/11/1 23:40:10

编程Tag： web http header client SERIAL arduino println ESP32 servo

本文主要是介绍Arduino ESP32 Web服务器控制舵机，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

Arduino ESP32 Web服务器控制舵机

利用ESP32的WIFI模块，创建一个简单的网络服务器来控制伺服电机。

实例代码

	#include <WiFi.h>
	#include "Servo.h"
	 
	Servo myservo;  // create servo object to control a servo
	// twelve servo objects can be created on most boards
	 
	// GPIO the servo is attached to
	static const int servoPin = 13;
	 
	// Replace with your network credentials
	const char* ssid     = "";
	const char* password = "";
	 
	// Set web server port number to 80
	WiFiServer server(80);
	 
	// Variable to store the HTTP request
	String header;
	 
	// Decode HTTP GET value
	String valueString = String(5);
	int pos1 = 0;
	int pos2 = 0;
	 
	void setup() {
	    Serial.begin(9600);
	    delay(1000);
	    myservo.attach(servoPin);  // attaches the servo on the servoPin to the servo object
	 
	    // 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
	        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("<!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>body { text-align: center; font-family: \"Trebuchet MS\", Arial; margin-left:auto; margin-right:auto;}");
	                        client.println(".slider { width: 300px; }</style>");
	                        client.println("<script src=\"http://www.lingzhilab.com/home/js/jquery.min.js\"></script>");
	 
	                        // Web Page
	                        client.println("</head><body><h1>ESP32 with Servo</h1>");
	                        client.println("<p>Position: <span id=\"servoPos\"></span></p>");
	                        client.println("<input type=\"range\" min=\"0\" max=\"180\" class=\"slider\" id=\"servoSlider\" οnchange=\"servo(this.value)\" value=\"" + valueString + "\"/>");
	 
	                        client.println("<script>var slider = document.getElementById(\"servoSlider\");");
	                        client.println("var servoP = document.getElementById(\"servoPos\"); servoP.innerHTML = slider.value;");
	                        client.println("slider.oninput = function() { slider.value = this.value; servoP.innerHTML = this.value; }");
	                        client.println("$.ajaxSetup({timeout:1000}); function servo(pos) { ");
	                        client.println("$.get(\"/?value=\" + pos + \"&\"); {Connection: close};}</script>");
	 
	                        client.println("</body></html>");
	 
	                        //GET /?value=180& HTTP/1.1
	                        if (header.indexOf("?value=") >= 0) {
	                            pos1 = header.indexOf('=');
	                            pos2 = header.indexOf('&');
	                            valueString = header.substring(pos1 + 1, pos2);
	 
	                            //Rotate the servo
	                            myservo.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("");
	    }
	}

这篇关于Arduino ESP32 Web服务器控制舵机的文章就介绍到这儿，希望我们推荐的文章对大家有所帮助，也希望大家多多支持为之网！

Arduino ESP32 Web服务器控制舵机

Arduino ESP32 Web服务器控制舵机

实例代码

相关编程文章