12 Apr
2008
12 Apr
'08
9:21 p.m.
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