'Pressure Sensitive Key'
What you are looking for sounds like the type of key that is used on some electronic musical
I am not current this, but you might try out the demo keyboards at a discount store to see
which ones have this feature.
My old Yamaha DX-II had these.
Mon, 21 Feb 2000 09:23:38 +1200
Lance Allen <AUCKLAND.AC.NZ> l.allen
I want to sense an analog response to how hard a button is being
pressed. A small button like any membrane keypad type except
rather than just a close or open an output that is continuous ,
doesn't have to linear or anything.
The PIC A/D will read this and use a lookup table.
I have been examining carbon loaded plastic and capacitance type
sensors but I am unhappy with what I have found so far, an off the
shelf solution would of course be best.
If anyone has any tips, links etc I would be grateful.
Brooke Clarke wrote:
> What you are looking for sounds like the type of key that is used on
> some electronic musical keyboards.
Ahh, now this provides a *whole new* slant on the problem. Musical
keyboards provide not a pressure-sensitive interface, but a velocity-
sensitive one. Is that what you want after all? It may be.
Velocity sensing is dead easy - it just requires two contacts which
operate at different points of the key travel (reliably). Most
commonly, the two contacts are the end points of a SPDT action and
correspond to the supply rails, so the logic must discriminate between
pulled high, pulled low and tri-state.
There are ways of doing this with a single PIC I/O. If you can spare
two I/O per switch, it's even easier.
More... (looser matching)
- Last day of these posts
- In 2000
, 2001 only
- New search...