int red1 = 5;
int yellow1 = 6;
int green1 = 7;
int red2 = 2;
int yellow2 = 3;
int green2 = 4;
int buttonPin = 10; 
bool lightsPaused = false; 
unsigned long lastButtonPress = 0; 
unsigned long debounceDelay = 50; 

#include <TM1637Display.h>
#define TEST_DELAY   2000
TM1637Display display1(9, 8);
TM1637Display display2(A0, A1);

void setup() {
  display1.clear();
  display1.setBrightness(7);
  display2.clear();
  display2.setBrightness(7);
  for (int i = 2; i < 10; i++) {
    pinMode(i, OUTPUT);
  }
  pinMode(buttonPin, INPUT_PULLUP); 
}

void loop() {
  
  int buttonState = digitalRead(buttonPin);
  if (buttonState == LOW && (millis() - lastButtonPress) > debounceDelay) 
  {
    lastButtonPress = millis();
    lightsPaused = !lightsPaused;
    if (lightsPaused) {
      digitalWrite(red1, LOW);
      digitalWrite(yellow1, LOW);
      digitalWrite(green1, LOW);
      digitalWrite(red2, LOW);
      digitalWrite(yellow2, LOW);
      digitalWrite(green2, LOW);
    }
  }
  if (!lightsPaused) {
    for (int i = 15; i >= 0; i -= 1) {
      int j = i - 3;
      digitalWrite(green1, LOW);
      digitalWrite(yellow1, LOW);
      digitalWrite(red1, HIGH);
      display1.showNumberDec(i, true, 2, 2);
      if (i >= 4) {
        digitalWrite(green2, HIGH);
        digitalWrite(yellow2, LOW);
        digitalWrite(red2, LOW);
        display2.showNumberDec(j, true, 2, 2);
      } else {
        digitalWrite(green2, LOW);
        digitalWrite(yellow2, HIGH);
        digitalWrite(red2, LOW);
        display2.showNumberDec(i, true, 2, 2);
      }
      delay(1000);
    }

    for (int i = 15; i >= 0; i -= 1) {
      int j = i - 3;
      digitalWrite(green2, LOW);
      digitalWrite(yellow2, LOW);
      digitalWrite(red2, HIGH);
      display2.showNumberDec(i, true, 2, 2);
      if (i >= 4) {
        digitalWrite(green1, HIGH);
        digitalWrite(yellow1, LOW);
        digitalWrite(red1, LOW);
        display1.showNumberDec(j, true, 2, 2);
      } else {
        digitalWrite(green1, LOW);
        digitalWrite(yellow1, HIGH);
        digitalWrite(red1, LOW);
        display1.showNumberDec(i, true, 2, 2);
      }
      delay(1000);
    }
  }
}