Patent ID: 6934561

Claim:
An intelligent accessory system for identifying a particular electronic device, the system comprising: a. a universal base unit having a control circuit, the control circuit having at least one input and at least one output, the universal base unit further comprising a resistor electrically coupled to the at least one input; and b. an interface device having both a first connector capable of mechanically and electrically coupling to the universal base unit and a second connector capable of mechanically and electrically coupling to at least one first electronic device, the interface device further comprising a capacitor with a value predetermined to correspond to the at least one first electronic device; further comprising a comparator electrically coupled in series between the resistor and the control circuit; wherein when the interface device is coupled to the universal base unit the capacitor and the resistor are electrically coupled in series; further wherein to identify the at least one first electronic device, the control circuit applies a voltage to the capacitor and measures an exponential voltage decay across the resistor.