Data transmission via XBee

hi guys,
i want read analog senor datas , send them wirelessly on xbee computer.
my setup:

transmitter:
arduino nano (powerd battery), reads 2 sensors (later want expand 6 sensors), , send them via xbee series 1, baudrate: 57600. transmitter code:

code: [select]


void setup() {
 serial.begin(57600);

}

void loop() {
int sensor0 = analogread(a0);
int sensor1 = analogread(a1);
serial.print("<");
serial.print(sensor0);
serial.print("/");
serial.print(sensor1);
serial.print(">");
delay(10);
}



receiver:
arduino mega, reads serial1 (connected xbee) , print values serial monitor. i'm using code found in post paul s in forum. code made receive data 1 sensor. extended 2 sensors. code:

code: [select]


void setup() {
serial.begin(57600);
serial1.begin(57600);
}

char indata[2][5];
int zeile;
int spalte;
boolean started = false;
boolean ended = false;

void loop()
{
  while(serial1.available() > 0)
  {
      char achar = serial1.read();
      if(achar == '<')
      {
          started = true;
          zeile = 0;
          spalte = 0;
          indata[spalte][zeile] = '\0';
      }
      else if(achar == '>')
      {
          ended = true;
      }
      else if(started)
      {
          if(achar != '/')       
          {
          indata[spalte][zeile] = achar;
          zeile++;
          indata[spalte][zeile] = '\0';
          }
           if(achar == '/')
           {
           zeile = 0;
           spalte++;
           indata[spalte][zeile] = '\0';
           }
      }   
  }

  if(started && ended)
  {
      // convert string integer
      char spalte0[4] = {indata[0][0], indata[0][1], indata[0][2], indata[0][3]};
      unsigned int sensor0 = atoi(spalte0);
      char spalte1[4] = {indata[1][0], indata[1][1], indata[1][2], indata[1][3]};
      unsigned int sensor1 = atoi(spalte1);

      // use value
      serial.print("sensor0 = ");
      serial.println(sensor0);
      serial.print("sensor1 = ");
      serial.println(sensor1);
     
     

      // ready next time
      started = false;
      ended = false;

      zeile = 0;
      spalte = 0;
      indata[spalte][zeile] = '\0';
  }
}


my problem:
the code works fine, if incomming value not higher 999. if 1000 1023, first sensor value displayed correctly, second 1 high...it seems there kind of overflow...

this copy serial monitor:
sensor0 = 874
sensor1 = 879 --> perfect

sensor0 = 1012
sensor1 = 7396 --> wrong

any ideas? there logical mistake in receiving code?

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