This contraption was created to pick winners for the 2nd LMR Donation Drawing.
See the included video for a demonstration.
At the heart of the LMR Prize Picker is the FetaDuino from Rocket Brand Studios.
It also features this old WICO Command Control joystick, and a BINGO cage.
Of course, BINGO stands for, "Basic Integrated Number Generator, Of couse."
The BINGO cage is rotated using this nifty gear motor, which I actually bought from JAX quite a while ago.
When a ball is selected, rolls down this shoot and is detected using a simple photo interrupter. A photo darlington and an LED flashlight are used for the detector.
Behind the scenes, two custom circuit boards provide voltage regulation (on the left) and a motor driver and resistor for the photo interrupted (right). A 7.2V NiMH battery provides ample power. Some wire management could be in order.