Hallo,
ich probiere gerade ein wenig im Bereich Webserver und habe folgenden Sketch (zugegeben, teilweise aus Internet-Fundstücken zusammengesetzt):
// #include <SPI.h> // ENC28J60 Ethernet
#include <UIPEthernet.h> // ENC28J60 Ethernet
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 200);
EthernetServer server(80);
String HTTP_req; // stores the HTTP request
boolean LED_status = 0; // state of LED, off by default
void setup()
{
Ethernet.begin(mac, ip); // initialize Ethernet device
server.begin(); // start to listen for clients
Serial.begin(9600); // for diagnostics
pinMode(3, OUTPUT); // LED on pin 3
pinMode(4, OUTPUT); // LED on pin 4
}
void loop()
{
EthernetClient client = server.available(); // try to get client
if (client) { // got client?
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) { // client data available to read
char c = client.read(); // read 1 byte (character) from client
HTTP_req += c; // save the HTTP request 1 char at a time
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println(F("HTTP/1.1 200 OK"));
client.println(F("Content-Type: text/html"));
client.println(F("Connection: close"));
client.println();
// send web page
client.println(F("<!DOCTYPE html>"));
client.println(F("<html>"));
client.println(F("<head>"));
client.println(F("<title>Arduino LED Control</title>"));
client.println(F("</head>"));
client.println(F("<body>"));
client.println(F("<h1>Christian's Webserver</h1>"));
client.println(F("<form method=get>"));
client.println(F("
Ausgang A <input type=submit name=a value=ein><input type=submit name=a value=aus>"));
client.println(F("
Ausgang B <input type=submit name=b value=ein><input type=submit name=b value=aus>"));
client.println(F("</from>"));
client.println(F("
"));
client.println(F("<p>Analog Eingang:</p>"));
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print(F("Analog Eingang "));
client.print(analogChannel);
client.print(F(" : "));
client.print(sensorReading);
client.println(F("
"));
}
client.println(F("</body>"));
client.println(F("</html>"));
Serial.println(HTTP_req);
if (HTTP_req.indexOf("GET /?a=ein")>0){
digitalWrite (3, HIGH);
Serial.println(F("Pin 3 Ein"));
}
if (HTTP_req.indexOf("GET /?a=aus")>0){
digitalWrite (3, LOW);
Serial.println(F("Pin 3 Aus"));
}
if (HTTP_req.indexOf("GET /?b=ein")>0){
digitalWrite (4, HIGH);
Serial.println(F("Pin 4 Ein"));
}
if (HTTP_req.indexOf("GET /?b=aus")>0){
digitalWrite (4, LOW);
Serial.println(F("Pin 4 Aus"));
}
HTTP_req = ""; // finished with request, empty string
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}
Prinzipiell läuft das, nur die Ausgänge schalten nicht (Zeile 69, 74, 77, 81).
Es sieht so aus als ob if (HTTP_req.indexOf("GET /?a=ein")>0) nicht wahr ist obwohl im HTTP_req String z.B. das GET /?a=ein enthalten ist.
Andere "fertige" Beispiele die auch mit index.Of arbeiten laufen aber problemlos.
Bitte, kann jemand einen Blick auf meinen Code werfen, ich übersehe wahrscheinlich ein Detail.
Christian
