Hi, I'm not an electrician and I don't know much about arduino
All I want is to replace my Expression pedal potentiometer with an optical sensor or something else
I want it to work withot external power so It must be analog As is the case with most Expression pedals
Is this possible or not? if yes..... What exactly do I need to do that? I have good experience in welding and I like to rely on myself in such matters
And how can I control the required voltage and offset it if necessary in order to get the rang I want?
note: I am talking about Expression pedal for keyboards.
Thank you
I'm not an electrical engineer so i don't know what all those symbol means
except LDR
Light depending resistor sensor If I'm not mistaken
yes maybe something like that
What exactly do I need?
Just ldr sensor? Connect it to trs cable directly?
The potentiometer has three legs, just like the drawing shows. Next to it is a light dependant resistor and a standard resistor configured as a voltage divider. You could almost just replace the potentiometer with two devices, but you probably need to mount the LDR somewhere external and run two wires to/from it.
You will also need to find out what value the potentiometer is, to be able to specify what LDR and value of resistor you need.
No. That's just one of those things you learn by doing. You'll also have to spend some time finding the right LDR (they each have ratings and values that need to be considered). I expect for your application the resistor will be something like 100R (100 ohms).
