System of stacked devices

Abstract

A method of implementing use cases includes associating a use case with each of a plurality of devices capable of being used or accessed by a user. The method also includes providing a plurality of stackable blades, each providing a standard physical interface and being configured to implement a solution to the use case associated with each of the plurality of devices. The method further includes stacking the plurality of stackable blades to form an interconnected stack. Each of the plurality of stackable blades are coupled using the standard physical interface. The method also includes executing a first purpose corresponding to a first use case and executing a second purpose corresponding to a second use case. Embodiments provide an electronic ecosystem featuring ubiquitous connectivity in which a standard contact array in each component of the ecosystem assures interoperability between heterogeneous devices.

What is claimed is: 
     
         1 . A user companion device comprising:
 a base unit comprising:
 a battery; and, 
 a communications unit; 
   a first blade coupled to the base unit and including a mobile payment unit; and   a second blade coupled to the first blade and including an electronic key unit.   
     
     
         2 . The user companion device of  claim 1  wherein the communications unit is operable to make and receive phone calls, messaging, and email. 
     
     
         3 . The user companion device of  claim 1  wherein the electronic key unit is operable to unlock a car door, a garage door, or a door of a building. 
     
     
         4 . The user companion device of  claim 1  wherein the user companion device further comprises a third blade comprising a user-selectable, personalized hardware element. 
     
     
         5 . The user companion device of  claim 1  wherein the user companion device is wearable on the user's wrist. 
     
     
         6 . The user companion device of  claim 1  further comprising a third blade coupled to the second blade, the third blade comprising a touch/display screen. 
     
     
         7 . The user companion device of  claim 1  wherein one or more of the first blade or second blade comprises speech recognition circuits.