我想用SD卡从Ethernet Shield控制伺服电机？ [英] I want to control a Servo motor from Ethernet Shield using SD Card?

问题描述

Hello Guys！

我正在练习使用我的Arduino Ethernet Shield进行我想做的项目，它包括从互联网上控制伺服电机，我的SD卡上有一个html代码

Hello Guys!
I Was Practicing with my Arduino Ethernet Shield for a Project i wanted to do and it consists of controlling a servo motor from the Internet, I had a html code on my SD Card

 #include <spi.h>
#include <ethernet.h>
#include <servo.h>
#include<sd.h>
Servo myservo;

byte mac[] ={0xDE, 0xAD, 0xBB, 0xEF, 0xFE, 0xED};
IPAddress ip(10,150,40,84);
IPAddress gateway(10,150,40,1);
IPAddress subnet(255,255,255,0);
EthernetServer server(80);
File webFile;
int pos =10;
String redString;
void setup(){
  myservo.attach(9);
  myservo.write(pos);
  Serial.begin(9600);
  pinMode(4,OUTPUT);
  Ethernet.begin(mac,ip,gateway,subnet);
  Serial.print("My Ip is : ");
  Serial.println(ip);
  server.begin();
  //Init SD Card
  if(!SD.begin(4)){
    Serial.println("ERROR - Initialization Failed!");
    return;
  }
  Serial.println("SUCCESS -SD card Initialized.");
  if(!SD.exists("securino.htm")){
    Serial.println("ERROR - Can't find securino.html");
  }else{
  Serial.println("SUCCESS - Found securino.html.");
  }
}
void loop(){
  EthernetClient client = server.available(); // try to get a client
  if(client){ // got a client
   boolean currentLineIsBlank = true;
   while(client.connected()){
     if(client.available()){// client data avail to read
       char c = client.read();// read 1 byte char from client
         // last line of client req. is blank and ends with \n
         // respond to client only after last line recieved
         if(redString.length()<100){
           redString+=c;
         }
         if(c="\n" && currentLineIsBlank){
           Serial.println(redString);
           // send a standard http response header
           client.println("HTTP/1.1 200 OK");
           client.println("Content-Type:text/html");
           client.println("Connenction:close");
           client.println();
           // send Web page
           webFile = SD.open("securino.htm");//open webpage
           if(webFile){
             while(webFile.available()){
               client.write(webFile.read());// send webpage to client
             }
             webFile.close();
           }
           break;
           if(redString.indexOf("?turnlft")>0){ // PROBLEM HERE ****

             pos = pos -10;
             myservo.write(pos);
           }
           if(redString.indexOf("?turnrght")>0){ // AND HERE ****
             pos = pos +10;
             myservo.write(pos);
           }
           redString ="";
         }
         //every line of text recieved from client ends with \r\n
         if(c=='\n'){
           //last char on line of recieved text
           //starting new line with next character read
           currentLineIsBlank = true;
         }
         else if(c!='\r'){
           //a text character was reciever from client
           currentLineIsBlank = false;
         }
     }
   }
   delay(1); //  give the browser time to recieve the data
   client.stop();
  }
}
           <pre lang="c++">

and Here is the HTML Code, I Think the Problem lies Here Could you Help me

This are the Two Link i used to Control the Motor
..........
<a href="\"/?turnlft\"\"">Turn Left</a>
<a href="\"/?turnrght\"\"">Turn Right</a>

推荐答案

1。你有混合client.write和client.println调用，你在发送html代码（正文）之前关闭连接

2.找到一个http客户端和url解析库为arduino确保redString 包含请求网址。我怀疑你的client.read方法是否有效！

3.调试你的http流量。

1. you have mixed client.write and client.println calls and you are closing the connection before sending the html code (body)
2. find a http client and url parsing library for the arduino to ensure "redString" contains the request url. I doubt your client.read method works!
3. debug your http traffic.

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