Problem

  char* date_time = (char*) calloc(80,sizeof(char));
  char* CO_Vout = (char*) calloc(80,sizeof(char));
  char* NO2_Vout = (char*) calloc(80,sizeof(char));
  char* O3_Vout = (char*) calloc(80,sizeof(char));
  char* cel = (char*) calloc(80,sizeof(char));
  char* hum = (char*) calloc(80,sizeof(char));
  char* e_NO2_Vout = (char*) calloc(80,sizeof(char));
  char* e_NO_Vout = (char*) calloc(80,sizeof(char));
  char* e_CO_Vout = (char*) calloc(80,sizeof(char));

Is still there...