Here are the three boards of "Blame." The biggest one (left) has the PIC microcontroller, DTMF decoder chip, and relays. The lower right hand board is an MP3 player, and the upper right hand board is the DC motor controller board.
Here is a sneak preview of the completed "Blame." The ultrasonic proximity detector is under the hand, and on either side of the arm motor are magnetic reed switches (used in home security on windows and such).