// ----------------------------------
// ------- 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 = 3;
int trigger_threshold = 14;
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;
}
delayMicroseconds(2);
}
};
MAIN SCRTIPT
needs a BLEKeyboard lib installed!
#include <Arduino.h>
#include <touchy.h>
#include <BleKeyboard.h>
// ----------------------------------
// -------MAIN LOOP -----------------
// ----------------------------------
// initalize the aTouch objects : aTouch namewahtevet(yourpinnumber);
aTouch touch1(2);
aTouch touch2(4);
aTouch touch3(15);
aTouch touch4(13);
/*
aTouch touch5(12);
aTouch touch6(14);
aTouch touch7(27);
aTouch touch8(33);
aTouch touch9(32);
*/
BleKeyboard bleKeyboard;
void setup(){
//Serial.begin(9600);
delay(100);
Serial.println("Starting BLE work!");
bleKeyboard.begin();
}
void loop() {
// simply read input and do some calc
touch1.readAndProcessInput();
touch2.readAndProcessInput();
touch3.readAndProcessInput();
touch4.readAndProcessInput();
/*
touch5.readAndProcessInput();
touch6.readAndProcessInput();
touch7.readAndProcessInput();
touch8.readAndProcessInput();
touch9.readAndProcessInput();
*/
if(touch1.is_triggered){
//Keyboard.write("a");
bleKeyboard.write( KEY_UP_ARROW );
}
if(touch2.is_triggered){
//Keyboard.write("a");
bleKeyboard.write( KEY_DOWN_ARROW );
}
if(touch3.is_triggered){
//Keyboard.write("a");
bleKeyboard.write( KEY_LEFT_ARROW );
}
if(touch4.is_triggered){
//Keyboard.write("a");
bleKeyboard.write( KEY_RIGHT_ARROW );
}
delay(100);
}