How do I attach 4 input pots to arduino?
It doesn't really matter as long as the the voltage across your pots doesn't exceed the ARef or IORef voltage, which is usually equal to Vcc (3.3V or 5V) for the Arduino boards. It's best to use the 5V from your board. The ADC inputs are relatively high impedance so very little current flows through. Don't use very large value pots or you might not get the correct values from your analog inputs.