 } SensorReading;
 
 
-// Global Variables
+// Global Variable
 int sleepCount = 0;
 int numCachedReadings = 0;
 int totalReadings = 0;

#define NUM_DISTANCE_READINGS      3
#define DISTANCE_READING_DELAY     200
#define DISTANCE_INCREMENT         5
#define DATA_DELIM                 ';'
#define BACKUP_FILENAME            "backup.txt"
#define UNSENT_FILENAME            "unsent.txt"

    if (sim900.ensureReady() == true)
    {
      sim900.sendTextMsg(smsBuffer, PHONE_NUMBER);
      if (sim900.isTextMsgDelivered(SMS_TIMEOUT) == false)
      {
        sd.begin();
        sd.writeFile(UNSENT_FILENAME, smsBuffer);
