CapTouch

CapTouch Test

int ref0, ref1;     //reference values to remove offset

int ADCTouch_read(byte ADCChannel, int samples) {
  long _value = 0;
  for(int _counter = 0; _counter < samples; _counter ++)
  {
    pinMode(ADCChannel, INPUT_PULLUP);

    analogRead(ADCChannel);

    /*
    ADMUX |=   0b11111;
    ADCSRA |= (1<<ADSC); //start conversion
    while(!(ADCSRA & (1<<ADIF))); //wait for conversion to finish
    ADCSRA |= (1<<ADIF); //reset the flag
    */

    pinMode(ADCChannel, INPUT);
    _value += analogRead(ADCChannel);
  }
  return _value / samples;
}

void setup() {
    // No pins to setup, pins can still be used regularly, although it will affect readings

    Serial.begin(9600);

    ref0 = ADCTouch_read(A0, 500);    //create reference values to 
    ref1 = ADCTouch_read(A1, 500);    //account for the capacitance of the pad
} 

void loop() {
    int value0 = ADCTouch_read(A0, 100);   //no second parameter
    int value1 = ADCTouch_read(A1, 100);   //   --> 100 samples

    value0 -= ref0;       //remove offset
    value1 -= ref1;

    Serial.print(value0 > 40);    //send (boolean) pressed or not pressed
    Serial.print("\t");           //use if(value > threshold) to get the state of a button

    Serial.print(value1 > 40);
    Serial.print("\t\t");

    Serial.print(value0);             //send actual reading
    Serial.print("\t");
  
    Serial.println(value1);
    delay(100);
}