update infinfrared, monitored, sht20, ds18b20 python code

Guo Wenxue

2019-03-19 9d78305854750d631a2c74b3fa77eeadf4616856

 modules/c/ds18b20.c

@@ -116,5 +116,7 @@
    /* convert string value to float value */
    *temp = atof(ptr)/1000;
   
    close(fd);

    return 0;
}