import network
from machine import Pin, freq, TouchPad
freq(240000000)
network.WLAN().active(False)
t=TouchPad(Pin(32))
while True:
    t.read()

This code writes a number like 603... which gets smaller as I get near the wire connected to pin 32.
As I touch it it gives TouchPad Error.

Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
ValueError: Touch pad error

If instead I do:

import network
from machine import Pin, freq, ADC
freq(240000000)
network.WLAN().active(False)
adc=ADC(Pin(32))
adc.atten(ADC.ATTN_11DB)

while True:
    adc.read()

it's vbery easy to understand even the distance between the finger and the header/wire.

I don't understand why the error.

Also:
I can do the same on Pin(34). TouchPad does not even allow it.. but ADC does.