Datasheet

Potentiometer – The 10K potentiometer is connected
between Vcc and Gnd with the wiper connected to channel 3.
Rotating the potentiometer will cause the voltage to vary between 0V and
Vcc. Rotating the potentiometer CW decreases the voltage on channel 3.
The potentiometer can be used as a general purpose analog control input. For
instance, the potentiometer can be read and the DAC output driving the LED can be
set to match the read value.