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(It also needs hardware in the form of 10M resistors.) Would it be challenging to make the arduino ADCTouch library work for Teensy 4.0? Right now it does not compile because of the absence of ADMUX, ADCSRA, and ADSC. Thanks for any suggestions on how to do this.

Many components... No offense Lalbert, but one diode and one resistor per pad is a lot more overhead than no external components! As far as I remember there is an atmega328 library that just uses internal pullups?

I liked teensy 3.2 very much because I could implement an octave of touch for USB synth. Is there a touch library for teensy 4 that can replace the native touch on 3.2?

Thankd - can go that route, just hoping to be able to use a few more pins this way

I've been trying to use the capacitance switch function below but haven't had any luck with Teensy LC, it always returns the default value. Should it work in theory with the Teensy LC? Do I need to do something about the pin mappings and registers? Thanks! uint8_t readCapacitivePin(int...