Splitting a variable

Using Arduino Programming Questions
1

Hi all,

I am creating a Arduino project to turn a spa pool pump on and off based on temperature and the output of my solar PV system.

I have been able to pull the following string in from my PV system, using a MQTT client and storing he output in a char* variable called PVraw.

PVraw contains data in the following format, captured straight from the PV meter [1462009949,1200,"W"] (Where 1200 is the current PV output in kw - this can range from 0 to 5000)

I need to be able to extract the 1200 part and store this in a interger (?) called PVgen.

I have researched various methods to split strings etc, however don't seem to be finding an easy way to do this.

Any help would be greatly appreciated.

Thanks,
Mark

2 
strtok()
3

This would be one way to go:

  • locate the first ','
  • get the number behind it
char pvBuffer[] = "[1462009949,1200,\"W\"]";
int PVraw;

void setup() {
  Serial.begin(115200);
  char* ptr = strchr(pvBuffer, ',');
  if (ptr) {
    PVraw = atoi(ptr + 1);
  }
  Serial.print(F("PVraw = "));
  Serial.println(PVraw);
}
void loop() {}

PVraw = 1200