newbie problem

Projects Interfacing w/ Software on the Computer
1

hi there

i have a problem..
this is my code:

#include <SPI.h>
#include <Ethernet.h>
#include "DHT.h"
#include <IRremote.h>
#include "ir.h"

#define DHTPIN 2     // DTH Sensor
#define DHTTYPE DHT22   // DHT 22  (AM2302)

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(10,86,100,201);
IRsend irsend;
EthernetServer server(16123);
DHT dht(DHTPIN, DHTTYPE);

void setup()
{
//  Serial.begin(9600);
//  while (!Serial)
//  {
    ; // wait for serial port to connect. Needed for Leonardo-Board only
//  }

  Ethernet.begin(mac, ip);
  server.begin();
  dht.begin();
//  Serial.print("server is at ");
//  Serial.println(Ethernet.localIP());
}


void loop()
{
  float h; 
  float t;
  
  EthernetClient client = server.available();
  if (client)
  {
//    Serial.println("new client");
    h = dht.readHumidity();
    t = dht.readTemperature();

    // isNaN (not a number)
    if (isnan(t) || isnan(h))
    {
//      Serial.println("ERROR: Failed to read from DHT");
    }

    String clientMsg = "";
    String clientbuffer = "";
    while (client.connected())
    {
      if (client.available())
      {
        char c = client.read();
        clientMsg += c;
        client.print(c);
  //      Serial.println(clientMsg);
        if (c == '\n') // Zeilenende: \n
        {
          clientMsg.toUpperCase();
          if (clientMsg.startsWith("GET "))
          {
            if (clientMsg.substring(4,9) == "KLIMA" )
            {
              client.print("Temperature:");
              client.println(t);
              client.print("Humidity:");
              client.println(h);
            }
          }
         if (clientMsg.startsWith("PUT "))
          {
            client.print("PUT: ");
            clientbuffer = clientMsg.substring(4,8);
            client.println(clientbuffer);
              if (clientbuffer == "IR P")
              {
                irsend.sendRaw(S_pwr,68,38);
              }
              if (clientbuffer == "IR 1")
              { client.println("jap");
                irsend.sendRaw(S_1,68,38); irsend.sendRaw(S_1,68,38); irsend.sendRaw(S_1,68,38);
              }              
              if (clientbuffer == "IR 2")
              {
                irsend.sendRaw(S_2,68,38);
              }
/*              if (clientbuffer == "IR 3")
              {
                irsend.sendRaw(S_3,68,38);
              }
              if (clientbuffer == "IR 4")
              {
                irsend.sendRaw(S_4,68,38);
              }
              if (clientbuffer == "IR 5")
              {
                irsend.sendRaw(S_5,68,38);
              }
              if (clientbuffer == "IR 6")
              {
                irsend.sendRaw(S_6,68,38);
              }
 */             if (clientbuffer == "IR 7")
              {
                irsend.sendRaw(S_7,68,38);
              }
              if (clientbuffer == "IR 9")
              {
                irsend.sendRaw(S_9,68,38);
              }
              if (clientbuffer == "IR 0")
              {
                irsend.sendRaw(S_0,68,38);
              }
              
              clientbuffer = "";
          }
         
          if (clientMsg.startsWith("BYE")) // byebye und tschüss
          {
            client.stop();
          }          
          
          clientMsg = "";
          delay(10);
          client.stop();
        }
      }
    }
    delay(10);
    client.stop();
//    Serial.println("client disonnected");
  }
}

this works fine..
but if i remove the comment (/* ........ */) am unable to connect to the arduino.. then, i comment out the same code, i am can connect... i have tested it 10x..
why? - This confuses me.. it's the same.. i can't understand this..

2

why? - This confuses me.. it's the same.. i can't understand this..

It ISN'T the same. Every if statement adds more code/uses more memory. You (still) only have a limited amount of it. When you've overfilled it, strange things happen. Get a Mega; get more memory.

3

The Ethernet library uses a lot of memory, but the code is still small.
It should easily fit into a Arduino Uno.

The String class seems to be the problem.
Can you use old style arrays as buffers and 'C' string functions ?

4

it's a atmega328 (arduino duemillanove).
ok. i can try it with ansi C char array's.

is it really possible that the memory is to small? - my program will be much bigger.. it's only the first part.
is there an other arduino with much more memory.. or is there another way...?

thanks.

5

is there an other ardunio with much more memory

The Mega has 8K. The DUE has 96K. By contrast the 328-based Arduinos have 2K.

6

you're right..
i used this code from Arduino Playground - AvailableMemory to test it.

i buy something with a mega 2560.

thanks