🔘 ماموریت ۳: دکمه و LED

سیم‌کشی

1. Arduino Uno (D2) ⟷ Push Button (PIN_A1)
2. Push Button (PIN_A2) ⟷ Arduino Uno (GND1)
3. Arduino Uno (D8) ⟷ مقاومت 220Ω (PIN1)
4. مقاومت 220Ω (PIN2) ⟷ LED (Blue) (ANODE)
5. LED (Blue) (CATHODE) ⟷ Arduino Uno (GND2)

کد

// Press the button → LED turns on.
const int BUTTON = 2;
const int LED    = 8;

void setup() {
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
}

void loop() {
  // INPUT_PULLUP: pressed = LOW
  if (digitalRead(BUTTON) == LOW) {
    digitalWrite(LED, HIGH);
  } else {
    digitalWrite(LED, LOW);
  }
}