The Freq Box is a wired-/or wireless-controller that produces a frequency number. Each knob controls one digit of the frequency. The red knob is a start/stop button. The controller talks to a program that I wrote in Processing. The program reads the input from each knob over serial and then translates that data into a frequency and outputs a sine wave at that frequency. This is done using the beads processing library. The micro-controller is my XBee-Atmel board, which also send info to the 4-digit/7-segment display on the controller. The Freq Box can be powered via internal 9volt or USB from the computer.