⏱️ ماموریت ۵۴: کرنومتر

سیم‌کشی

1. Arduino Uno (D2) ⟷ Push Button (PIN_A1)
2. Push Button (PIN_B1) ⟷ Arduino Uno (GND2)

کد

const int BTN = 2;
bool running = false;
unsigned long startTime = 0;
int lastBtn = HIGH;

void setup() {
  pinMode(BTN, INPUT_PULLUP);
  Serial.begin(9600);
  Serial.println("Press to start");
}

void loop() {
  int btn = digitalRead(BTN);
  if (lastBtn == HIGH && btn == LOW) {
    if (!running) {
      startTime = millis();
      running = true;
      Serial.println("Go!");
    } else {
      running = false;
      Serial.print("Time: ");
      Serial.print((millis() - startTime) / 1000.0);
      Serial.println(" s");
    }
    delay(30);   // tiny debounce
  }
  lastBtn = btn;
}