Textile prototype using touch input and direct visual feedback.
Both LED and Touch Helper Lib is needed for this in prior.
// ----------------------------------
// -------- BASIC HELPERS LED & TOUCH --------
// ----------------------------------
// basic lerp function
float return_lerp(float _s, int _target, int _time) {
_s = _s + (( float(_target) - _s) / float(_time));
return _s;
}
// --------------
// LED Object
// -------------
class aLED {
private:
byte pin;
long ts = 0;
int led_mode = 0; //0 manual / 1:sinpulse / 2:fading
public:
int brightness = 0; // current brightness
float fade_target = 0; // where to fade?
int fade_speed = 4;
float pulse_speed = .004; // speed of pulse when in pulsemode
int pulse_amplitude = 125;
aLED(byte pin) {
this->pin = pin;
init();
}
void init() {
pinMode(pin, OUTPUT);
}
void operateLED() {
if (led_mode == 0) {
// if in manual mode
} else if (led_mode == 1) {
// ----------- PULSE MODE
brightness = int((sin(millis() * pulse_speed) + 1) * pulse_amplitude * .5);
} else if (led_mode == 2) {
// ----------- FADING MODE
brightness = int(return_lerp(brightness, fade_target, fade_speed));
}
analogWrite(pin, brightness);
}
void setMode(int _mode) {
led_mode = _mode;
}
};
class aTouch {
private:
bool prev_touch_state = false;
byte pin;
int smooth_time = 2;
int trigger_threshold = 8;
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 PROGRAM --------
// ----------------------------------
// setup the LED object aLED namewhatever(pin);
aLED led1(19);
aTouch touch1(2);
aTouch touch2(4);
bool holdmode = false;
int hold_ticker = 0;
bool has_record = false;
float curr_pulsespeed = .1;
void setup() {
Serial.begin(9600);
}
void loop() {
led1.operateLED(); //operate specific LED
touch1.readAndProcessInput();
touch2.readAndProcessInput();
if( touch2.is_holded){ Serial.println("Touch2 hold very long"); holdmode = false; hold_ticker = 0; }
if( touch1.is_holded){ Serial.println("Touch1 hold very long"); holdmode = true; }
if(holdmode == false){
if( touch1.on_pressed){
led1.setMode(0);
led1.brightness=255;
led1.setMode(2);
led1.fade_target=1;
}
}else{
// -------------------
// ------- IN HOLDMODE -----------
// ----------------------
hold_ticker++;
led1.setMode(1);
led1.pulse_speed=.00002*float(hold_ticker);
led1.pulse_amplitude = int(.1*hold_ticker)+2;
curr_pulsespeed =.00002*float(hold_ticker);
has_record = true;
}
if( touch1.on_released){
if( hold_ticker == 0){
has_record = false;
}
if(has_record ){
led1.setMode(1);
led1.pulse_speed = curr_pulsespeed*2.;
led1.pulse_amplitude = 122;
}else{
led1.setMode(0);
led1.brightness=0;
}
holdmode = false;
hold_ticker = 0;
}
delay(20);
}