The smart-tender is a fun project that can get done in a day, as long as you have all the required items needed to complete the project. The only down side to this particular setup is the new limitations stablished by IFTTT on only having 3 free applets if you don't have a pro account. But I believe that should be more than enough to get the job done.
IFTTT totally makes the process of interacting with smart devices really trivial, perhaps at some point in the future, could be worth paying $36/year but for now I can get it done with 3 applets.
Share your thoughts and let me know how can you improve the project, without adding complexity and keeping it still accessible to many non technical people.