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lib/Button2/examples/ESP32classicCapacitiveTouch/ESP32classicCapacitiveTouch.ino

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+/////////////////////////////////////////////////////////////////
+
+#if !defined(ESP32)
+  #error This sketch needs an ESP32 Classic
+#else
+
+/////////////////////////////////////////////////////////////////
+
+#include "Button2.h"
+
+#define TOUCH_PIN T0 // Must declare the touch assignment, not the pin. For example, T0 is GPIO4 and T3 is GPIO 15. 
+// You can look up the touch assignment in the datasheet: https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
+
+int threshold = 40;   // ESP32
+bool touchActive = false;
+bool lastTouchActive = false;
+bool testingLower = true; 
+byte buttonState = HIGH;// HIGH is for unpressed, pressed = LOW
+/////////////////////////////////////////////////////////////////
+
+Button2 button;
+
+/////////////////////////////////////////////////////////////////
+void gotTouchEvent(){
+  if (lastTouchActive != testingLower) {
+    touchActive = !touchActive;
+    testingLower = !testingLower;
+    // Touch ISR will be inverted: Lower <--> Higher than the Threshold after ISR event is noticed
+    touchInterruptSetThresholdDirection(testingLower);
+  }
+}
+
+
+byte capStateHandler() {
+    return buttonState;
+}
+
+/////////////////////////////////////////////////////////////////
+
+void setup() {
+    Serial.begin(115200);
+    delay(50);
+    Serial.println("\n\nCapacitive Touch Demo");
+    touchAttachInterrupt(TOUCH_PIN, gotTouchEvent, threshold);
+
+    // Touch ISR will be activated when touchRead is lower than the Threshold
+    touchInterruptSetThresholdDirection(testingLower);
+    button.setDebounceTime(35);
+    button.setButtonStateFunction(capStateHandler);
+    button.setClickHandler(click);
+    button.begin(VIRTUAL_PIN);
+}
+
+/////////////////////////////////////////////////////////////////
+
+void loop() {
+  button.loop();
+  if(lastTouchActive != touchActive){
+    lastTouchActive = touchActive;
+    if (touchActive) {
+      buttonState = LOW;
+    } else {
+      buttonState = HIGH;
+    }
+  }
+}
+
+/////////////////////////////////////////////////////////////////
+
+void click(Button2& btn) {
+    Serial.println("click\n");
+}
+
+/////////////////////////////////////////////////////////////////
+#endif
+/////////////////////////////////////////////////////////////////