Thanks. I only got this far because the meeting provided me with much
needed deadline pressure. ;-)
They also naturally provide a gate (when you're touching the screen), and
you can trill by pressing on one spot and tapping another to offset the
voltages. I have a Blacet Miniwave kit (waiting for a Stooge panel) so I'll
have to try out the quantizer when I get it built.
I don't have an MOTM-700 to try yet, but I imagine you could divide the
screen into two or four zones with one (of course that would apply to a
joystick too).
...Craig
----- Original Message -----
From: "John Loffink" <jloffink@...>
To: "'Craig Critchley'" <craigc@...>; <motm@yahoogroups.com>
Sent: Wednesday, July 24, 2002 8:04 PM
Subject: RE: [motm] Pacific NW SDIY Meeting & analog touch panel controller
This looks like a nice project. I bought a few of these touchpads
myself with the same intentions, but have never freed up enough time to
get past the block diagram stage. Good luck on yours. These seem to
have an advantage over a joystick as you can instantaneously jump to any
voltage. They could also be tied to a specialized quantizer type
circuit and function as a rudimentary, monophonic style "keyboard." It
would be simple enough to create templates placed under the glass for
any configuration of "keys."
John Loffink
jloffink@...
-----Original Message-----
From: Craig Critchley [mailto:craigc@...]
Sent: Tuesday, July 23, 2002 10:54 PM
To: synth-diy@...; motm@yahoogroups.com
Subject: [motm] Pacific NW SDIY Meeting & analog touch panel controller
I took my MOTM system to Saturday's synth DIY meeting, along with my DIY
touch panel controller project.
A while back there was some traffic on synth-diy about ribbon
controllers,
and then Larry Hendry posted his notice about a good deal on Bourns pots
at
Electronics Goldmine. I poked around that site looking for other
promising
deals, and found surplus ELO touch screens for $5 each. These are glass
panels you put over an LCD screen to make a touch-sensitive computer
input
device.
I ordered one and did a little research on the 'net. It turned out to
be a
5-wire resistive touchscreen, which wasn't too hard to interface. I
built a
device with a microcontroller and a couple of sample-and-holds which
generates a gate when you touch the screen along with analog voltages
proportional to the X and Y position you touch, sort of like a
two-dimensional ribbon controller. It has a few bugs and unfinished
features, but its basically working.
Anyway, people seemed to like playing around with it at the meeting.
I've
set up a (rudimentary) page about it at
http://www.fuzzer.com/Synthesizers.html. Unfortunately, I've been
rather
busy since Sat. and don't have my pictures posted yet. You can see a
picture of the touch panel with the MOTM in Toby Paddock's pictures,
though.
...Craig