ATTINY85 and POT

Question

I need to read a potentiometer value from an ATTINY85. I have big fat 10K POT but for this use case I need it to be very small so I used a salvaged 2.4K one, the kind that is soldered directly onto a PCB.

I am using tinkercad to prototype my project and I am facing a very weird problem. Everytime I read from the POT Pin, I get the value of 512 (using the debugger)

Here is a screenshot of my prototype:

The goal is to power the circuit and the lamp (does not matter what is there, consider it just a load) with a 9V battery, use a 5V regulator to power the ATTINY85 and use an NPN transistor to turn the lamp/load on or off.

For information, the whole regulator and transistor setup is tested and works like a charm.

Here is the code I wrote for the this case:

void setup()
{
  pinMode(PB0, INPUT);
}

int potValue = 0;

void loop()
{
  potValue = analogRead(PB0);
  delay(100);
}

Not real fancy right? Now no matter what use for the POT, and I tried 2.4K, 10K and up to 100K, the value read by the ATTINY is always 512.

Do you see something wrong in this setup? Could it be a bug in tinkercad? (I'd be surprised though)

I could try and share this circuit within tinkercad if someone would be willing to have a look...

EDIT: I just tried with PB2 as suggested but not the value is always 58:

Answer 1

Port PB0 is not an ADC (analog input) pin on the ATTiny85.

Available pins of the ATTiny85 (from the Atmel ATtiny 25, 45, 85 datasheet):

Choose PB2, PB3, PB4 or PB5 if you need an analog input.

Additional information: When built in TinkerCAD, using PB2 as an analog input does not seem to work correctly and produces a fixed value. Using PB3 did work correctly however. This might be a bug in TinkerCAD.