🔋 ماموریت ۷۵: زمان شارژ خازن

سیم‌کشی

1. Arduino Uno (D7) ⟷ مقاومت 220Ω (PIN1)
2. مقاومت 220Ω (PIN2) ⟷ خازن 10µF (POS)
3. خازن 10µF (POS) ⟷ Arduino Uno (A0)
4. خازن 10µF (NEG) ⟷ Arduino Uno (GND1)

کد

const int CHARGE = 7;

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

void loop() {
  digitalWrite(CHARGE, LOW);             // empty the capacitor first
  while (analogRead(A0) > 5) {}
  delay(200);

  unsigned long t0 = millis();
  digitalWrite(CHARGE, HIGH);            // start charging through 10k
  while (analogRead(A0) < 647) {}        // 63 % of 1023
  unsigned long ms = millis() - t0;

  Serial.print("Time constant: ");
  Serial.print(ms);
  Serial.println(" ms");                 // 10k x 100uF = about 1000 ms
  delay(2000);
}