Instructables

Contact microphone to listen to finger-taps

My idea is to attach a contact microphone to the wrist to listen to finger-taps and determine which fingers produce the taps.
Assumptions:
- The tap sound propagates along the bones like in tubes, 
- Each finger produces a characteristic sound signal.
- Pattern recognition of sound signals identifies the sound and the finger that produces it.

Any help?

Thanks

rickharris1 year ago
I guess this is possible but I doubt there is a lot of difference between fingers. I could be wrong on that.

If you attach the sensor to the surface to be tapped you could use a Pizeo sounder as a sensor, A microphone will need to be conditioned before sending the signal to the microprocessor/computer.

A shmitt trigger should do the job.
brian.s (author)  rickharris1 year ago
Thank you for the reply, I know it's challenging but in my application it is necessary to have the acoustic sensor on the wrist.
Same response.