Your touchInterrupt T0 and T3 are both assigned to 15
Touch 0 = IO 4
Touch 1 = IO 00 ( may not be available)
Touch 2 = IO 2
Touch 3 = IO 15
Touch 4 = IO 13
Touch 5 = IO 12
Touch 6 = IO 14
Touch 7 = IO 27
Touch 8 = IO 33
Touch 9 = IO 32

Use something like Baseblock ComTest Pro to sample the messages on a PC http://www.baseblock.com/
You will need to connect with FTD module od similar

I'm impressed!

Second version of spread sheet, shows about 100K bytes/second transfer

Most of my BT classic is limited to low numbers of bytes so I thought that I would try larger transfers. This is the result of Bytes sent from an APP to an ESP32 using classic bluetooth, no delays introduced The bytes are send via an array which I populated with the same character. At the end of the...

II was really trying to understand what part of the interrupt caused the count delay but I didn't get to the high frequency input limitation. Except for the port call there is not much difference between your and my code... As to your frequency meter I don't have an LCD and was going to adjust your ...

Thanks for that
I tried your code against my original and didn't really see any difference in accuracy or stability. Can you explain what you saw with your code please.

Search this on UTUBE
He gives a polynomial to linearise the analogs..
The best series of tutorials on the ESP32 I have come across


Tech Note 069 - Using the ESP32 ADC and some of its more advanced functions

I cant see why it doesnt work

Have you tested BT recieve by using something like this

if (Serial.available() > 0) {
// read the incoming byte:
incomingByte = Serial.read();

// say what you got:
Serial.print("I received: ");
Serial.println(incomingByte, DEC);
}
}

Have a look at this on UTUBE

He provides a polynomial to linearise an analog


G6EJD

Tech Note 069 - Using the ESP32 ADC and some of its more advanced functions