Detecting Third button press

Projects Programming
28

Hello,
check out the proposal for your school assignement.

/* BLOCK COMMENT
  ATTENTION: This Sketch contains elements of C++.
  https://www.learncpp.com/cpp-tutorial/
  https://forum.arduino.cc/t/detecting-third-button-press/919620
*/
#define ProjectName "Detecting Third button press"
// hardware and timer settings
constexpr byte ButtonOnePin {A0};      // portPin o---|button|---GND
constexpr byte ButtonTwoPin {A1};      // portPin o---|button|---GND
constexpr byte ButtonThreePin {A2};     // portPin o---|button|---GND
constexpr byte Led2Pow0Pin {2};        // portPin o---|220|---|LED|---GND
constexpr byte Led2Pow1Pin {3};        // portPin o---|220|---|LED|---GND
constexpr byte Led2Pow2Pin {4};        // portPin o---|220|---|LED|---GND
constexpr byte Led2Pow3Pin {5};        // portPin o---|220|---|LED|---GND
unsigned long BlinkDuration {1000}; // times in msec
// CONSTANT DEFINITION
// forward declaration using function prototype
void blinkBlink();
void buttonOnePressed();
void buttonOneReleased();
void buttonTwoPressed();
void buttonTwoReleased();
void buttonThreePressed();
void buttonThreeReleased();
// VARIABLE DECLARATION AND DEFINITION
unsigned long currentTime;
struct TIMER {              // has the following members
  unsigned long duration;   // memory for interval time
  bool repeat_;             // control for blinking
  bool control_;            // control for start/stop
  unsigned long stamp;      // memory for actual time
};
struct BUTTON {
  byte pin;
  bool statusQuo;
  void (*task[2])();
  unsigned long stamp;
  unsigned long duration;
} buttons[] {
  {ButtonOnePin, false, {buttonOneReleased, buttonOnePressed}, 0, 20},
  {ButtonTwoPin, false, {buttonTwoReleased, buttonTwoPressed}, 0, 20},
  {ButtonThreePin, false, {buttonThreeReleased, buttonThreePressed}, 0, 20},
};
struct BOX {
  byte leds[4];
  int counter;
  TIMER timer;
} box {{Led2Pow0Pin, Led2Pow1Pin, Led2Pow2Pin, Led2Pow3Pin}, 0, BlinkDuration, true, false, 0};
// ------------------ USER FUNCTIONS ---------------
bool checkTimer(TIMER & time_) {  // generic time handler using TIME struct
  if (currentTime - time_.stamp >= time_.duration && time_.control_) {
    if (time_.repeat_) time_.stamp = currentTime;
    else time_.control_ = false;
    return true;
  } else return false;
}
void startTimer(TIMER &timer) {
  timer.control_ = true;
  timer.stamp = currentTime;
}
void stoppTimer(TIMER &timer) {
  timer.control_ = false;
}
void checkButton() {
  for (auto &button_ : buttons) {
    if (currentTime - button_.stamp >= button_.duration) {
      button_.stamp = currentTime;
      bool stateNew = !digitalRead(button_.pin);
      if (button_.statusQuo != stateNew) {
        button_.statusQuo = stateNew;
        button_.task[stateNew]();
      }
    }
  }
}
void blinkBlink() {
  box.counter++;
}
void upDate() {
  int element = 1;
  for (auto led : box.leds) digitalWrite (led, (box.counter & element ? 1 : 0)), element *= 2;
}
void buttonOnePressed() {
  box.counter++;
}
void buttonOneReleased() {
 }
void buttonTwoPressed() {
   startTimer(box.timer);
}
void buttonTwoReleased() {
}
void buttonThreePressed() {
   stoppTimer(box.timer);
   box.counter=0;
}
void buttonThreeReleased() {
}
void setup() {
  Serial.begin(9600);
  Serial.println(F("."));
  Serial.print(F("File   : ")), Serial.println(__FILE__);
  Serial.print(F("Date   : ")), Serial.println(__DATE__);
  Serial.print(F("Project: ")), Serial.println(ProjectName);
  pinMode (LED_BUILTIN, OUTPUT);  // used as heartbeat indicator
  //  https://www.learncpp.com/cpp-tutorial/for-each-loops/
  for (auto Button : buttons) pinMode(Button.pin, INPUT_PULLUP);
  for (auto Output : box.leds) pinMode(Output, OUTPUT);
  // check outputs
  for (auto Output : box.leds) digitalWrite(Output, HIGH), delay(100);
  for (auto Output : box.leds) digitalWrite(Output, LOW), delay(100);
}
void loop () {
  currentTime = millis();
  digitalWrite(LED_BUILTIN, (currentTime / 500) % 2);
  if (checkTimer(box.timer)) blinkBlink();
  checkButton();
  upDate();
}

Have a nice day and enjoy coding in C++.