Here is an example of basic usage for the helper functions.
// ----------------------------------
// -------MAIN LOOP -----------------
// ----------------------------------
// initalize the aTouch objects : aTouch namewahtevet(yourpinnumber);
aTouch touch1(2);
aTouch touch2(4);
aTouch touch3(12);
void setup() {
Serial.begin(9600);
}
void loop() {
// simply read input and do some calc
touch1.readAndProcessInput();
touch2.readAndProcessInput();
touch3.readAndProcessInput();
// just call the touch object properties for further logic :)
if(touch2.on_pressed){ Serial.println("Touch2 pressed"); }
if(touch2.on_released){ Serial.println("Touch2 released");}
if( touch2.is_holded){ Serial.println("Touch2 hold very long"); }
delay(40);
}
This is the main code for the helpers. This code needs to be put prior to your mainloop code.
// ----------------------------------
// ------- TRXYS TOUCH HELPERS ------
// ----------------------------------
// ( put this code PRIOR to your mainloop code or you will get nice errors :) )
// simple lerp helper function
float return_lerp(float _s, int _target,int _time){
_s = _s + (( float(_target) - _s)/float(_time));
return _s;
}
class aTouch {
private:
bool prev_touch_state = false;
byte pin;
int smooth_time = 4;
int trigger_threshold = 15;
long ts = 0;
public:
int current_val = 0;
int smoothed_val = 0;
int diff_val = 0;
bool is_triggered = false;
bool on_pressed = false;
bool on_released = false;
bool is_holded = false;
aTouch(byte pin) {
this->pin = pin;
}
void readAndProcessInput() {
// reset interaction states
on_pressed = false;
on_released = false;
// directly read out values TWICE = BUGFIX for debouncing
current_val = touchRead(pin);
delayMicroseconds(10);
current_val = touchRead(pin);
//calculate smoothed input values
smoothed_val = return_lerp(smoothed_val,current_val,smooth_time);
// calc current differential sum of button
diff_val = smoothed_val - current_val;
// check if there is a noticable difference input values
if( diff_val > trigger_threshold){
if(prev_touch_state == false){
is_triggered = true;
prev_touch_state = is_triggered;
on_pressed = true;
ts = millis(); // set timestamp for hold routine
}
}else if( diff_val < trigger_threshold*-.4){
if(prev_touch_state == true){
is_triggered = false;
prev_touch_state = is_triggered;
on_released = true;
}
}
// calculate timed holding function
if( ts + 2500 < millis() && is_triggered){
is_holded = true;
}else{
is_holded = false;
}
}
void printAllMetadata() {
// only use this on one touchinput only - it will skrew up else
Serial.print (on_pressed);
Serial.print(",");
Serial.print (on_released);
Serial.print(",");
Serial.print (is_triggered);
Serial.print(",");
Serial.print (current_val);
Serial.print(",");
Serial.println(smoothed_val);
}
};