🔘 ماموریت ۷۳: انتخاب حالت با کلید گردان

سیم‌کشی

1. Rotary Switch (COM) ⟷ Arduino Uno (GND2)
2. Arduino Uno (D2) ⟷ Rotary Switch (P1)
3. Arduino Uno (D3) ⟷ Rotary Switch (P2)
4. Arduino Uno (D4) ⟷ Rotary Switch (P3)
5. Arduino Uno (D5) ⟷ Rotary Switch (P4)
6. Arduino Uno (D9) ⟷ LED (Green) (ANODE)
7. LED (Green) (CATHODE) ⟷ مقاومت 220Ω (PIN1)
8. مقاومت 220Ω (PIN2) ⟷ Arduino Uno (GND1)

کد

int readMode() {
  for (int i = 0; i < 4; i++) {
    if (digitalRead(i + 2) == LOW) return i + 1;   // the one pin tied to COM
  }
  return 0;
}

void setup() {
  for (int p = 2; p <= 5; p++) pinMode(p, INPUT_PULLUP);
  pinMode(9, OUTPUT);
}

void loop() {
  switch (readMode()) {
    case 1: digitalWrite(9, LOW); break;
    case 2: digitalWrite(9, HIGH); break;
    case 3: digitalWrite(9, (millis() / 500) % 2); break;   // slow blink
    case 4: digitalWrite(9, (millis() / 100) % 2); break;   // fast blink
    default: digitalWrite(9, LOW); break;
  }
}