How I can see the voltage of an analog pin without a potentiometer?

Projects Programming
1

Hello
How I can see the voltage of an analog pin without a potentiometer?

I talked with some people and the said me that I have to use the potentiometer to know that, but I i see that there are persons that don't need the potentiometer to know the voltage of an analog pin.
I don't want to use the potentiometer, because I don't have any potentiometer.

By the way I'm using the Arduino uno

Sorry for my bad English

2

What is the voltage on the pin (what is the pin connected to?), or is the pin unconnected, and therefore floating?

3

If there is any voltage on the pin, if it is connected to anything that has a voltage, the Arduino can "see" that voltage with analogRead() of the pin. Then it can print it for you to see.

Steve

4

Ohhhh, I understand, thank you people!