We can do a lot of fun programming exercises with just one Button and one LED – plus there are several issues to take away that occur in every day programmers life 🙂 – First off a quick starting point:
LED Helper class
// ----------------------------------
// -------- BASIC LED HELPER --------
// ----------------------------------
// 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;
}
};
BUTTON Helper class
// --------------
// Digital Button helper class
// -------------
class aBUTT {
private:
byte bpin;
long ts = 0;
bool previous_state = false;
bool previous_state_holded = false;
public:
bool is_pressed = false;
bool is_holded = false;
bool on_pressed = false;
bool on_released = false;
bool on_holded = false;
aBUTT(byte bpin) {
this->bpin = bpin;
init();
}
void init() {
pinMode(bpin, INPUT);
}
void operateBUTTON() {
is_pressed = digitalRead(bpin);
on_pressed = false;
on_released = false;
if (previous_state != is_pressed) {
if (is_pressed) {
ts = millis();
on_pressed = true;
} else {
on_released = true;
is_holded = false;
on_holded = false;
previous_state_holded = on_holded;
}
previous_state = is_pressed;
}
on_holded = false;
if (ts + 1000 < millis() && is_pressed ) {
is_holded = true;
if (previous_state_holded != is_holded && is_pressed ) {
on_holded = true;
previous_state_holded = is_holded;
//Serial.println("holdi");
}
}
}
};
Mainloop
// ----------------------------------
// -------- MAIN LOOP --------
// ----------------------------------
aLED led1(11);
aBUTT button1(12);
void setup() {
Serial.begin(9600);
}
void loop() {
led1.operateLED(); //operate specific LED
button1.operateBUTTON();
if(button1.is_pressed){
led1.setMode(1);
led1.pulse_speed = .01;
}else{
led1.setMode(0);
led1.brightness = 0;
}
if(button1.on_pressed){
Serial.println("BUTTON DOWN");
}
if(button1.on_released){
Serial.println("BUTTON UP");
}
if(button1.on_holded){
Serial.print(".");
}
delay(10);
}
RECORD AND PLAYBACK Button Input
Here we have a more advanced piece of code to record the button input and play it back afterwards with the LED. Get the code over here: