This mechatronic device designed and built in Mechanical Engineering 333 is an automatic bass guitar tuner. The automatic tuner operates in two modes: manual tuning and automatic tuning. In manual tuning mode, the device operates like a standard tuner. The user plucks a string on the instrument, the tuner outputs to the LCD screen the closest note to the resonating string, and how far out of tune the note is (as shown below).

if tuned below an A, or if the string was properly tuned to an A.

In automatic tuning mode, the user selects what note he/she wants the pre-selected string to be tuned to via the input dial. Then he/she places the instrument in the tuning jig, places the motor and tuning peg adapter on the tuning peg of the string to be tuned. Next the user turns on the device, and plucks the string to be tuned. The device senses what note is being played, then powers the motor to tune the string to the user inputted note.

The automatic tuner project has three main parts: the frequency measurement circuit, the mechanical fixture with motor, and the controlling code.

Documentation completed 3/14