Write string to SD card and send string via xbee

Projects Programming
5

Thank you for your help thus far. I have changed my code to no longer read the RFID tag into a string; however, i still cannot write the RFID tag to the SD card.

#include <XBee.h>
#include <SD.h>
#include <SPI.h>

XBee xbee;

File dataFile;

char RFID_tag[17];

void setup() {
  //initiate xbee and wait
  xbee.begin(9600);
  delay(6000);
  // RFID tag reader 
  Serial1.begin(9600);
  delay(400);
  
  Serial.begin(9600);
  delay(400);
  
  pinMode(10, OUTPUT); 
  // see if the card is present and can be initialized:
  if (!SD.begin(4)) {
    // don't do anything more:
    return;
  }
}

void loop() {
    // get RFID tag string
    Serial1.readBytesUntil('/r',RFID_tag,17);
    // if there is a string write to SD and send
    if (sizeof(RFID_tag) > 0){  
      // open the file. note that only one file can be open at a time,
      // so you have to close this one before opening another.
      dataFile = SD.open("data.txt", FILE_WRITE);   
      
      // if the file is available, write to it:
      if (dataFile) {
          dataFile.println(RFID_tag);
          dataFile.close();
      }
      // form packet to transmit (DL - destination address (HEX), payload, size of payload)  
      Tx16Request tx16 = Tx16Request(0x0100, (uint8_t*)RFID_tag, sizeof(RFID_tag));
      // transmit packet
      xbee.send(tx16);
}
}//loop() end