Question about connecting an expression pedal to analog in (Brain v.1)

garubi

Hallo,

for my Hammond MIDI controller I need to connect an expression pedal to a Brain's analog input (I need it to control the Volume).

I looked at your YouTube tutorials (this one:http://www.youtube.com/watch?v=FuySTcMex5w) but it leaves me with a question:

Since I can't assume that the pedal would be always connected (One could forgot it at home, or the pedal could die during a gig... etc), does the wiper pin of the female jack has to be connected to GND (or V) when the pedal isn't connected? 

Or, putting the question in another way: Do I have to get a stereo female jack with a switch so that the wiper can be short circuited to V or GND when the pedal is not connected?

Thank you!

Stefano

Mark

If you are not using a wiper, you will need it to be grounded or disabled in the editor.

garubi

Thank you Mark!

Stefano

garubi

One more question Mark.

I've got a famale jack with a switch, so when the pedal jack is plugged out the analog signal pin is automatically grounded.

I haven't soldered it yet, but it should work, right?

The problem:

I expect that when Signal is grounded, the CC value from that analog input will drop to 0.

I need that the CC value remain at least at 64 (more or less) so that even without the volume pedal connected I have some volume from my device.

Could I solve this issue by putting a resistor between the GND and the Signal? Could it work? What value should the resistor have?

Tahnks for you help

Stefano

garubi

Hallo again,

I solved connecting the female jack so that when the pedal isn't connected the wiper is "short circuited" to V+ so to the Brain it looks like the signal it is at its maximum.

Stefano

Mark

Nice!