arduino-esp32/libraries/ESP32/examples/Touch/TouchRead/TouchRead.ino

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// ESP32 Touch Test
// Just test touch pin - Touch0 is T0 which is on GPIO 4.
void setup()
{
Serial.begin(115200);
delay(1000); // give me time to bring up serial monitor
Serial.println("ESP32 Touch Test");
}
void loop()
{
Serial.println(touchRead(T1)); // get value using T0
delay(1000);
}