Yes thank you. The code below stops the skectch from crashing but when i type in the serial monitor 123456789123456789> (longer then 16 bytes) i then got the sketch to print out what it just received in the str and i get this 1234567891234567** (the * is garbage) but i think this tells me the code is still putting more then 16 bytes in the buffer.
//Reads data from the ELM IC.
//For example 41 0C 7B 7B>.
byte STN_Read(char *str)
{
byte i = 0;
char temp;
while((temp = Serial.read()) != '>')
{
if(temp >= ' ' && temp <= '~')
{
Serial.println(i);
Serial.println(temp);
str[i++] = temp;
}
if(i == 16)
{
return 0;
}
}
str[i] = '\0';
return 1; //No data to read or buffer full.
}