Playing the guitar is fun as it is. But if you are a bit nerdier, then why not adding something weird to it to amaze friends. Youtuber Make It And Fake It has been tinkering with Arduino, servo and couple of chopsticks and put together a crude guitar attachment which can stroke strings with different patterns.
The functionality is yet still limited as for different strokes it needs reprogramming with three control buttons. For more functionality, additional coding might be needed. The fun demonstration at the end of the video proves to be fun from both – funny and practical side. With a bit of tuning one hand really can be free to play another instrument to make the song even better. Servo motor seems to be too loud while playing; maybe there are more quit versions of them. The Arduino code can be found on GitHub.