YES NOPE9 wrote:
> I want to be able to robotically press buttons on a cell phone.
> This means the throw of the button press will not be more than 5mm.
> I have seen mention of buttons requiring 21 pounds of pressure.

Sounds waaaaay high.  *Think* about it.  Can you press a cell phone button
with your pinky?  Probably.  Can your pinky press with 21 pounds?  Quite
unlikely.  Or think of it this way.  Picture a filled plastic one gallon
milk jug held so that it presses on the end of a pencil with the other end
of the pencil pressing on a cell phone button.  Wouldn't the cell phone
button be easily pressed with far less force?  In fact, this might crush th=
e
end of the pencil, and that's only 8 pounds.

> One thing I am considering is some kind of doo-hickey using nitinol
> wire.

What's wrong with the obvious and common push-type solenoid?

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.