microwave_game.ino

//inspired by https://twitter.com/paulpod/status/1330091111889690628

#include <Arduino.h>
#include <TM1637Display.h>
#include <Bounce2.h>

#define CLK 2
#define DIO 3
#define pin_button A0

int duration = 3000;
long timeLastPressed = duration;
boolean stopped = false;

Bounce button = Bounce(pin_button, 50);  // ms debounce for button
TM1637Display display(CLK, DIO); // four digit seven segment display

void setup()
{
  display.clear();
  pinMode(pin_button, INPUT_PULLUP); 
  display.setBrightness(0); // 0 to 7 
}

void maintainDisplay() {
  static const unsigned long REFRESH_INTERVAL = 1; // how often in ms to update the display
  static unsigned long lastRefreshTime = -1;
  if(millis() - lastRefreshTime >= REFRESH_INTERVAL) { //should we update the display?
    lastRefreshTime += REFRESH_INTERVAL; 
    updateDisplay();
  }
}

void updateDisplay() {
  long now = millis();
  int displaytime = now - timeLastPressed;
  if (displaytime >= 0) { // has the countdown has run out?
    displaytime = 0;
    stopped = true;
  }
  display.showNumberDec(abs(displaytime), true); // show displaytime without center colon, with leading 0s
}

void loop() {
  if (button.update()) {
    if (button.fallingEdge()) {
        stopped = ! stopped;
        timeLastPressed = millis() + duration;
    }
  }
  if (! stopped) {
    maintainDisplay();   
  }
}