[sdiy] Substitute for pin matrixes? Neat solution?

[karl dalen]

Guess what i found?

Bipolar hall switch!!!

A hall sensor who detects S or N pole and accordingly
switches position with Schmitt trigger action!

This little fellow can drive a Cmos switch directly!

One match with a tiny S pole Nib magnet glued on top and another
match with N pole magnet, now play your matrix in real time!
Kind of miniature cricket! 

Now, guess whats inside this sensor? A Cmos switch! Unfortunately
its not open ended otherwise it would have been absolutely ideal!

http://se.farnell.com/rohm/bu52025g-tr/hall-effect-ic-ssop5/dp/1716307
http://se.farnell.com/rohm/bu52011hfv-tr/hall-effect-ic-hvsof5/dp/1716301

Exclamation mark.

Regards! :)
KD


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