The circuit is highly-flexible so that you can use any SIM900A modem (and ofcourse any Arduino Uno board) of your choice. Carefully read the modem documentation before construction to make the task ...

Arduino MKR IOT Bundle: There is a slew of Arduinos you can choose from. But for most home automation decisions, the is a great option and affordable ($89 at Amazon).

We've seen a lot of DIY home automation projects over the years, but Instructables user electronichamsters shows off one of the most complete systems we've seen yet. With it, you'll be able to ...