Hospitality HAL was born out of necessity. The MakerHive had a serious lack of friendly robot voices greeting makers and visitors at the door. While everyone recognized the problem, no one was willing to put in the time to develop the various parts required for a welcoming robotic experience.
With the addition of the OneSheeld, the project was too easy not to complete. Using the Voice Recognition, Twitter, Camera, and Text-to-Speech shield Hospitality HAL was created in short order.
The Hardware is simply an Arduino Uno (Sparkfun RedBoard) and a OneSheeld connected to a Big Red Dome button from Sparkfun (COM-11960). The button is only used for the LED, which is connected to pin 9 and GND on the Arduino.