char** explode(char delimiter, char* str) {
	int l = strlen(str), i=0, j=0, k=0;
	char x = NULL;
	char** r = (char**)realloc(r, sizeof(char**));
	r[0] = (char*)malloc(l*sizeof(char));
	while (i<l+1) {
		x = str[i++];
		if (x==delimiter || x=='\0') {
			r[j][k] = '\0';
			r[j] = (char*)realloc(r[j], k*sizeof(char));
			k = 0;
			r = (char**)realloc(r, (++j+1)*sizeof(char**));
			r[j] = (char*)malloc(l*sizeof(char));
		} else {
			r[j][k++] = x;
		}
	}
	return r;
}

void setup() {
   Serial.begin(115200);
    char S[] = "1,2,3,5,10,68,79";
    int i = 0,m = 0;
    char** a = explode(',',S); 
    //Принтуем массив
    for (i = 0; i < 7; i++) { 
        Serial.println(a[i]);
    }  

}

void loop() {
  // put your main code here, to run repeatedly:

}