void loop(){
  int count = 0;
  while(count < 30)
  {
    count++;
    float value = readval();
    Serial.println(value);
  }
  while(true){
  };

}


float readval()
{
int byt=0;
float val=0;
float tot=0;
  //function reads a value from the SD card values are stored as character floats with two dp and seperated with either a space or a new line, carriage return.
  while(byt != 10 && byt != 32 )
  {
    //read character
    byt = (myFile.read());
    //find begining of value

    //check for character ending
    if(byt != 13 && byt != 10 && byt != 32)
    {
      //check for decimal place
      if(byt != 46)
      {
        val = byt-48;
        tot *= 10;
        tot += val;
      }
    else if(byt == 46)
      {
        byt = (myFile.read());
        val = byt - 48;
        val /= 10;
        tot += val;
        byt = (myFile.read());
        val = byt - 48;
        val /= 100;
        tot += val;
      }
    }

  }

  return tot;
}