#include <TM1637Display.h>
#include <Servo.h>

#define CLK_PIN 2
#define DIO_PIN 3
#define START_PIN 4
#define STOP_PIN 5
#define RESET_PIN 6
#define LED_PIN 7
#define SERVO_PIN 8

unsigned long start_time;
unsigned long elapsed_time;
bool is_running = false;

TM1637Display display(CLK_PIN, DIO_PIN);
Servo servo;

void setup() {
  display.setBrightness(7); 
  display.showNumberDecEx(0, (1 << 2) | (1 << 3)); 
  pinMode(START_PIN, INPUT_PULLUP);
  pinMode(STOP_PIN, INPUT_PULLUP);
  pinMode(RESET_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
  servo.attach(SERVO_PIN);
}

void loop() {
  if (digitalRead(START_PIN) == LOW && !is_running) {
    start_time = millis() - elapsed_time;
    is_running = true;
    display.clear();
    digitalWrite(LED_PIN, HIGH);
    servo.write(90); 
    
  } else if (digitalRead(STOP_PIN) == LOW && is_running) {
    elapsed_time = millis() - start_time;
    is_running = false;
    unsigned int seconds = elapsed_time / 1000;
    unsigned int milliseconds = elapsed_time % 1000;
    display.showNumberDecEx((seconds * 100) + (milliseconds / 10), (1 << 2) | (1 << 3));
    digitalWrite(LED_PIN, LOW);
    servo.write(0); 
    
  } else if (digitalRead(RESET_PIN) == LOW) {
    elapsed_time = 0;
    is_running = false;
    display.showNumberDecEx(0, (1 << 2) | (1 << 3));
    digitalWrite(LED_PIN, LOW);
    servo.write(0); 
    
  }
  
  if (is_running) {
    elapsed_time = millis() - start_time;
    unsigned int seconds = elapsed_time / 1000;
    unsigned int milliseconds = elapsed_time % 1000;
    display.showNumberDecEx((seconds * 100) + (milliseconds / 10), (1 << 2) | (1 << 3));
  }

  delay(10);
}