test_adc.py

from machine import Pin, ADC

adc0 = ADC(Pin(26))
adc01 = ADC(26)
adc1 = ADC(Pin(27))
adc2 = ADC(Pin(28))
adc3 = ADC(Pin(29))
adc4 = ADC(4)

print(adc0.read_u16())
print(adc01.read_u16())
print(adc1.read_u16())
print(adc2.read_u16())
print(adc3.read_uv())
print(adc4.read_u16())