[PD] FSR and velocity sensitive keyboards
Martin Peach
martin.peach at sympatico.ca
Sat Apr 12 21:21:54 CEST 2008
Steffen Juul wrote:
> Inspired by the (other) topic on force sensitive resisters:
>
> How is velocity sensitive keyboards made, do they use FSR's of some
> sort?
>
I think FSRs would be best for a touch-sensitive keyboard, where the
keys don't move. My edirol PC-70 seems to time the delay between two
switch contacts, the cheapest possible method (I had to open it up to
clean the contacts under a couple of keys). A piezo might be better (and
less expensive than FSR) for instantaneous force detection of a key
hammer. Piezo elements will generate a voltage proportional to pressure,
while FSRs change resistance with pressure and are not as fast, so they
don't register impacts very well.
Martin
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