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Topic: reading CV  from volume pedal (Read 899 times) previous topic - next topic

gorgon

Hi!

Does anyone know how to read CV (control voltage) from a expression/volume pedal (ex behringer fcv100)? Connecting a jack cable to the output of the pedal and then the tip to analog in and the ring to 3/5v on the arduino gives no result.

This is what the specs sheet on the pedal says:
input/output:
1/4" TS connectors, unbalanced
Tip: Supply voltage from unit/instrument
to be controlled (Impedance: 50 k[ch937])
Ring: Slider pick-up (control voltage
dependend on pedal position
(Impedance: 0...50 k[ch937])

Sorry if this is very basic - I couldnt find any info on it when searching.. Any help is highly appreciated!

Thanks!
Martin

MikMo

You should connect the ring to ground on Arduino.

gorgon

thanks for the quick reply MikMo.

so,
tip -> analog in
ring -> ground

does not give me anything. I doubt that the pedal sends out any voltage.

Franklin

tip = 5v (from arduino)
ring = analog pin
Stephen

gorgon

Quote
tip = 5v (from arduino)
ring = analog pin


this does also not work, it only gives the value 0.

MikMo

if you have acces to a volt meter try to meassure whats coming out of the pedal, to establish if it is sendig out the expecte voltage

Franklin

Have you tried reading the plug with a VOM?
Stephen

Franklin

#7
Nov 28, 2008, 11:11 pm Last Edit: Nov 28, 2008, 11:20 pm by Franklin Reason: 1
Just what are you inputting that you are trying to read? This device changes the volume out of the signal input as far as I can tell.
Stephen

monk_tavern

Hi gorgon,

A volume pedal is typically just a potentiometer set up as a voltage divider. There has to be an input signal--what is the input in your case?

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