[sdiy] Ensoniq patent, was: distance meter for keyboard, was: Where to get special white keys?

[Ian Fritz]

At 06:42 PM 3/1/2009, Kyle Stephens wrote:

>You can get Hall sensors for $0.50/a pop here, and at $0.45 for 100+ 
>quantities:
>
>http://www.allelectronics.com/make-a-store/item/SS-19T/HALL-EFFECT-MAGNETIC-POSITION-SENSOR/-/1.html

Those are switches.  You need *linear* Hall sensors.