This is a glass harp that can be controlled via OSC.
spinning stand is made mostly from old printer parts and a disk from hard drive. motor is slowed down with simple ne555 pwm circuit. 'finger replacement' is made from piece of wet cotton.
the pitch can be changed by changing the water level inside glass. i did this by submerging water filled ballon in it. balloon height is changed by small servo motor driven by teensy board. servo position can be changed by sending OSC (open sound control) message from my phone (by wifi) to the laptop which then sends command to the teensy board by serial.
There is a thread on Hackaday forum about this project: http://forums.hackaday.com/viewtopic.php?f=3&t=2401.
It has also been featured on Hackaday: Servo controlled wine glass plays the music of the angels