Posted in Arduino Hacks, Misc Hacks Tagged arduino, dtmf, pots, telephone ← Awesome Portable N64 Keeps Your Games In Hand, Out Of Sight Manage Your Rechargeables At A Glance → ...

The phone-to-Arduino interface is the tricky part, after all. DTMF is an easy standard to work with and it avoids having to go through the hassle of a USB or Bluetooth device, for instance.