Ever been in the living room and wanted to turn off that lamp you forgot about in the bedroom or even start air condition or the heater in another room without moving from your couch??
Why not just build an RF controller that controls the devices from in your house?
In this project a small system was created using RF transmitter & receiver modules. Our mission was to send wireless a command from one arduino to control the other.
In this simple system the arduino with the RF transmitter reads an input from Serial COM and transmits it. Then the arduino with the receiver reads the command. If it receives letter “L” it lights an LED and if the received letter is “T” the LED turns off.
The project:
Ok, now you may think “are you kidding?? What the air condition and heater turning on/off has to do with this you just told us??”. If you thing about it, replace the LED with a relay and instead of Serial COM use 2 input buttons ass inputs. Now, you could start any device connected to the relay around the house (or outside of it!).
Enjoy your new house control! :p