Arduino Forum

Using Arduino => Project Guidance => Topic started by: marco_c on Aug 27, 2016, 08:08 am

Title: Guitar aid for a disabled person
Post by: marco_c on Aug 27, 2016, 08:08 am
I have been asked to help design an aid that would allow someone with one hand to play a guitar. This particular person will probably need to have a foot pedal controlling a device for what would be the 'strumming' hand.

The only thing I have found that could be modified/controlled using some electronics is at http://www.thehammerjammer.com/index.html (http://www.thehammerjammer.com/index.html)
Ben Heck also did a 2 part video for an electromechanical device https://www.youtube.com/watch?v=RlNKix43ULY (https://www.youtube.com/watch?v=RlNKix43ULY), but his is a bit invasive on the guitar!

Other devices that allows chords to be played:
http://makezine.com/2012/04/23/arduino-mod-lets-disabled-musicians-play-guitar/ (http://makezine.com/2012/04/23/arduino-mod-lets-disabled-musicians-play-guitar/)
https://www.ultimate-guitar.com/news/general_music_news/you_dont_have_to_bother_learning_guitar_anymore_this_mechanical_device_will_do_it_for_you_now.html (https://www.ultimate-guitar.com/news/general_music_news/you_dont_have_to_bother_learning_guitar_anymore_this_mechanical_device_will_do_it_for_you_now.html)
but these are at the 'wrong end' of the guitar.

Any ideas? Looking for concepts or prior projects at this stage rather than detailed technical discussion of possible implementation.
Title: Re: Guitar aid for a disabled person
Post by: DrDiettrich on Aug 27, 2016, 12:00 pm
A realistic device would implement kind of an electric piano, with one hammer for each string. Then single strings can be activated, or all in sequence with up and down strokes in reversed sequence. More stroke types can be programmed, like with electronic rhythm devices, which then can be synchronized from the foot pedal or other sensors.
Title: Re: Guitar aid for a disabled person
Post by: marco_c on Aug 27, 2016, 12:40 pm
As I understand it, not being a guitar player, there is a difference in sound between a strike and a pluck of the string. The Hammer Jammer device is a striker device as you describe.
Title: Re: Guitar aid for a disabled person
Post by: INTP on Aug 27, 2016, 12:50 pm
If there is adept finger control and strength, strumming is unnecessary with the tapping style if playing. Percussive tapping on the frets with sensitive pickups is all that's needed.
Title: Re: Guitar aid for a disabled person
Post by: Johnny010 on Aug 27, 2016, 01:12 pm
Maybe just using a servo for each string with the servo arms acting like fingers. Maybe making your own designed "fingers" can get the sound close to that of a real finger pluck?
As far as strum...a similar device that just runs an arm over all strings. Timing may be too much of an issue to use all 6 servos to replicate a strum like sound where there is a small delay between each string strike.
Title: Re: Guitar aid for a disabled person
Post by: TomGeorge on Aug 27, 2016, 01:54 pm
Hi,
I have somewhere seen a musical instrument that has a handle at one end, it turns a wheel  that has brushes on half of its circumference.
When the handle turns, the wheel strums the brushes over the strings, faster you turn the faster the strum, the player then uses his other hand to finger the strings.

Tom... :)
I shall go searching.

Title: Re: Guitar aid for a disabled person
Post by: TomGeorge on Aug 27, 2016, 02:00 pm
Hi
BINGO.. its called a Ghironda.
(https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Ghironda3.jpg/1024px-Ghironda3.jpg)



http://www.wikiwand.com/it/Ghironda

Hope the principal helps.... Tom... :)
Title: Re: Guitar aid for a disabled person
Post by: allanhurst on Aug 27, 2016, 03:03 pm
The above device looks rather like the ancient 'hurdy gurdy' !

and it seems as if it probably works in a similar way.

Harpsichord's use a plucking action - perhaps you could have a look at their mechanism and get a hint..

regards

Allan

Title: Re: Guitar aid for a disabled person
Post by: TomGeorge on Aug 27, 2016, 03:44 pm
Hi,
The above device looks rather like the ancient 'hurdy gurdy' !

and it seems as if it probably works in a similar way.

Harpsichord's use a plucking action - perhaps you could have a look at their mechanism and get a hint..

regards

Allan


Yes... That is the name I was thinking of, thank-you, now I can go to bed not thinking about it.
Tom.. nighty night... :smiley-sleep:
Title: Re: Guitar aid for a disabled person
Post by: marco_c on Aug 28, 2016, 01:05 pm
Great ideas so far, thanks all.

The harpsichord mechanism for plucking looks straightforward for a solenoid push/pull implementation.