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/*
 * Capacitive touch code using ESP32 GPIO4 (TOUCH0)
 */ 
const int touchPIN = 4;           //Touch button PIN
const int n = 50;                 //Number of averages for threshold calc
bool interruptFlag = false;

int thresholdValue = 0;           //Used to detect when pressed
int touchSensorValue = 0;         //Holds touch value
int TEMP = 0;


int thresholdCalc(){
  for(int i=0; i<n; i++){
    touchSensorValue = touchRead(touchPIN);
    TEMP += touchSensorValue;
  }//end for
  return (TEMP/(n*2));            //Sets thresholdValue to 1/2 the average measured value
}//end thresholdCalc


void IRAM_ATTR interruptRoutine(){           //Interrupt routine 
  interruptFlag = true;
}//end interruptRoutine



void setup(){
  Serial.begin(115200);
  delay(1000); 
  thresholdValue = thresholdCalc();
  touchAttachInterrupt(touchPIN, interruptRoutine, thresholdValue);     //Setup the interrupt
}//end setup


void loop(){

  if(interruptFlag){
    interruptFlag = false;
    Serial.println("Touch detected");
    //Serial.println(measureButton());
  }//end if
  delay(50);

}//end loop