🌙 ماموریت ۲۰: چراغ خواب خودکار

سیم‌کشی

1. Arduino Uno (VCC5) ⟷ Photoresistor (LDR) (B)
2. Photoresistor (LDR) (A) ⟷ Arduino Uno (A0)
3. Arduino Uno (D13) ⟷ مقاومت 220Ω (PIN1)
4. مقاومت 220Ω (PIN2) ⟷ LED سفید (ANODE)
5. LED سفید (CATHODE) ⟷ Arduino Uno (GND1)

کد

// Night light: when it gets dark, the LED turns on.
// Select the LDR and drag its "light level" slider to test!
const int LED = 13;

void setup() {
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int light = analogRead(A0);      // 0 = dark, 1023 = bright
  Serial.print("Light: ");
  Serial.println(light);

  if (light < 400) {
    digitalWrite(LED, HIGH);       // dark → light on
  } else {
    digitalWrite(LED, LOW);        // bright → light off
  }
  delay(200);
}