How can you remotely control home heating? Here is an SMS remote control system using the mobile network, featuring relay outputs and a temperature sensor. It’s based on an ATmega328P and the Arduino environment! Follow the development journey of this home automation project, including the transition from 2G to 4G.

Many of our readers who own a second home with electric heating will relate to this: the house is cold when you arrive. The same goes for hot water, which isn’t available until the next day due to the long heating time of the water heater. Yet keeping these appliances running constantly when the house is unoccupied would be neither reasonable nor economical. Clearly, remote control would be an advantage.

Commercial solutions exist, and searching for “GSM remote switch” on AliExpress yields several results. However, after testing one such device, I found it incompatible with French phone networks and poorly documented. Given the high cost of more reliable commercial ...