This is a collection of the Perl programs I’ve written to perform various functions in my Arduino/HCA project. Most important are the two programs that send and receive data to and from the Arduinos and HCA. Other programs are included to show you the range of capabilities that can be added, such as generating web pages, collecting weather station data, even collecting data and controlling a Venstar thermostat. I’ve tried to be careful in copying these in-production programs. If you find any errors or see something to improve please contact me and we can all benefit from it.