pH/ORP stamp Atlas scientific

Projects Interfacing w/ Software on the Computer
13

Right Ok, so I have got rid of the pH problem I was having here is how I solved it:

if (sensorPH_stringcomplete)  //if a string from the Atlas Scientific product has been received in its entirety
 { 
   char buf[sensorstringPH.length()];
   sensorstringPH.toCharArray(buf, sensorstringPH.length());
   float pH_reading = atof(buf);
   float check = pH_reading*10;
   Serial.println(check);

As for EC problem I have found out that I can split the string using:

#include <string.h>

char EC_reading;

String Filename = "50000,3720,42.5";
void setup()
{
 Serial.begin(9600);
   char buf[Filename.length()];
  Filename.toCharArray(buf,Filename.length());
 char *p = buf;
 char *str;
  while ((str = strtok_r(p, ",", &p)) != NULL) // delimiter is the comma
  Serial.println(str);
}

void loop(){}

however two problems:

  1. Why does this miss out the last number from Filename (ie the 5)? Not a big issue as I only want to use the first value but still dont understand why it does this. If I put a delimiter at the end of my string it will pick up everything
  2. What does str become? Is it a character array? Im having difficulty extracting just the '5000' before I then will convert it to a float for use elsewhere in my code