graph LR
p[Pico] -->|ADC_VREF 36 row=6| pos(Positive)
p[Pico] -->|AGND 33 row=8| neg(Negative)
p[Pico] -->|GP26 pin=26 ADC0 31 row=10| tap(Center Tap)
pos(Positive) --- pot(Potentiometer)
neg(Negative) --- pot(Potentiometer)
tap(Center Tap) --- pot(Potentiometer)