[sdiy] Doepfer ribbon controller pinout ?

[Scott Juskiw]

At 2:24 PM -0400 2006/04/15, harrybissell wrote:
>LOL... the title says it all.
>
>Anyone have it ?  Four pins... has to be
>ground, reference, and position and force
>
>but whobewho ?  TIA

Finally, a question that I can answer.

There are 5 connections. One ground, two for pressure sensor, and two 
for position sensor. The ground connection is via the shield on the 
USB connection. The rest of the pins are:

pin 1: Pressure B (one side of a pressure sensitive resistor)
pin 2: Pressure A (the other side of a pressure sensitive resistor)
pin 3: Position B (the output signal)
pin 4: Position A (the driving signal)

Take a look at my Sword of Kahless controller user guide and 
schematics for all the answers.

http://www.tellun.com/motm/diy/tln854/TLN-854.html


There are four signals and a ground connection between the R2M 
control box and the
manual. Two of the signals are for the position sensor (Position A 
and Position B), the
other two are for the pressure sensor (Pressure A and Pressure B). 
The position sensor
can best be thought of as a 10K potentiometer with a wiper that can 
be disconnected. One
side of the potentiometer is connected to ground, the other side is 
connected to +2.5 volts
(Position A). When the manual is not being touched, the pot wiper 
(Position B) is
disconnected from the potentiometer and is pulled up to +3.65 volts. 
Touching the
manual connects the wiper to the potentiometer and a voltage of 
between 0 and +2.5 volts
appears at the wiper, depending on where the manual is touched. When 
the manual is
released, the voltage on the wiper immediately jumps back up to +3.65 volts.

The voltage at the wiper (Position B) does not appear directly at the 
output of the R2M.
Instead, the R2M processes the raw wiper voltage to generate both 
MIDI data and the
position control voltage and gate signals. This processing results in 
a delay of between
2.5 msec and 7.5 msec between when the wiper voltage first drops 
below +2.5 volts and
when the R2M gate signal goes high. The position control voltage 
changes 50 sec before
the gate signal goes high. When the manual is released, there is a 
delay of between 0.3 msec and 5.0 msec between when the wiper voltage 
first goes above +2.5 volts and when
the R2M gate signal goes low.

The pressure sensor simply acts a pressure sensitive resistor. With 
no pressure applied the
resistance is large, many megohms, with increasing pressure the 
resistance drops, to near
zero with excessive force. This resistance appears as the Pressure A 
and Pressure B
signals.
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