[sdiy] capacitive sensors - AD7147

[Scott Nordlund]

Ensoniq did something very similar in the late 80's to early 90's.  There's a small metal plate under each key, and a coiled circuit board trace underneath that, with a squishy foam rubber pad separating them (hall effect sensors?  I'm not sure).  A microprocessor calibrates everything when started, and then scans the sensors for note on/off, velocity, and polyphonic aftertouch (presumably release velocity would be possible as well).  There are no electrical contacts, and nothing to get dirty or wear out.  I think they patented it, but it must be expired by now.

----------------------------------------
> From: jhaible at debitel.net
> To: lanterma at ece.gatech.edu; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] capacitive sensors - AD7147
> Date: Mon, 24 Aug 2009 08:30:10 +0200
> CC:
>
> A quick glance at this, and it seems to say: "Polyphonic aftertouch - with just a piece of copper foil unter each key!"
>
> JH.
>
> ----- Original Message -----
> From: "Aaron Lanterman" 
> To: "synthdiy DIY" 
> Sent: Monday, August 24, 2009 8:05 AM
> Subject: [sdiy] capacitive sensors - AD7147
>
>
> Has anyone played with the AD7147? It looks pretty cool. 13 inputs
> gives a full octave keyboard.
>
> - Aaron
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