---

#include <QuadDisplay.h>

#define BUTTON_PIN 2
#define LED_PIN 3
#define DISPLAY_PIN 4

int s = 0;
unsigned long t = 0;

void setup() {
  Serial.begin(9600);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
  displayInt(DISPLAY_PIN, 0);
}

void loop() {
  if (digitalRead(BUTTON_PIN) == LOW || Serial.read() == 'R') {
    s = 0;
    Serial.println(s);
    displayInt(DISPLAY_PIN, 0);
    digitalWrite(LED_PIN, LOW);
    delay(500);
    t = millis();
  }

  if (s > 0) digitalWrite(LED_PIN, HIGH);

  if (millis() - t >= 1000) {
    t = millis();
    s++;
    Serial.println(s);
    displayInt(DISPLAY_PIN, (s / 60) * 100 + (s % 60));
  }
}



ХУЙ

import serial
import tkinter as tk

try:
    ser = serial.Serial('COM4', 9600, timeout=0.1)
except:
    exit()

def update():
    if ser.in_waiting:
        line = ser.readline().decode().strip()
        if line.isdigit():
            v = int(line)
            lbl.config(text=f"{v//60:02d}:{v%60:02d}")
    root.after(50, update)

root = tk.Tk()
root.title("Timer")

lbl = tk.Label(root, text="00:00", font=("Arial", 60))
lbl.pack(pady=20)

tk.Button(root, text="RESET", command=lambda: ser.write(b'R'), bg="red", font=("Arial", 20)).pack()

update()
root.mainloop()