update LED definition and add infrared source code

guowenxue

2019-01-30 b06022623775de9ab47ef1ce355c5ecd134b8529

 modules/c/ds18b20.c

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

    return 0;
}