DTMF Module and Arduino Remote Control of Devices

My yet another remote control project about control of devices and appliances using a DTMF module and Arduino. DTMF module can detect and resolve the key pressed from a dialpad or phone. By the help of this we can remotely control many outputs. In my project I used Arduino Mega because it has more digital pins, a DTMF module (very cheap at Chinese sites) and an online dtmf tone generator. you can use an old phone to connect to the system and call it from another phone to send dialtones, or you can embed the tone generator app to your website to remotely control 10 devices over internet. For demonstration purposes I used 10 leds connected to 10 digital outputs of the Mega to simulate controlled outputs. I wrote a simple sketch for sensing the key press and decoding the key pressed to activate outputs but someone can read multiple keypresses and control unlimited outputs using multiplexers. The dtmf module has 4bit output for decoding and keypress sensing stq pin too. The circuit is simple and my Arduino sketch is also provided. Details are on my website at: http://borsaci06.com/Projects.html