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[on:]

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

[Reply #1 on:]

You should connect the ring to ground on Arduino.

[Reply #2 on:]

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.

[Reply #3 on:]

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

[Reply #4 on:]

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

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

[Reply #5 on:]

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

[Reply #6 on:]

Have you tried reading the plug with a VOM?

[Reply #7 on:]

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.

[Reply #8 on:]

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?