Unit 8: On the Wire

 

 

 

Code for Sketch One: 

const int BUZZER_PIN = 9;    // Buzzer pin
const int WIRE1_PIN = 2;     // Wire 1 pin (trigger alarm)
const int WIRE2_PIN = 3;     // Wire 2 pin (no effect)

void setup() {
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(WIRE1_PIN, INPUT_PULLUP);  // Use internal pull-up resistor
  pinMode(WIRE2_PIN, INPUT_PULLUP);  // Use internal pull-up resistor
}

void loop() {
  bool wire1State = digitalRead(WIRE1_PIN);
  bool wire2State = digitalRead(WIRE2_PIN);

  if (wire1State == HIGH) {
    tone(BUZZER_PIN, 1000); // Play a 1kHz tone
  } else {
    noTone(BUZZER_PIN);
  }

  delay(500); // Debounce delay
}
  

 

Code for Sketch Two: 

const int BUZZER_PIN = 9;    // Buzzer pin
const int WIRE1_PIN = 2;     // Wire 1 pin
const int WIRE2_PIN = 3;     // Wire 2 pin
const int WIRE3_PIN = 4;     // Wire 3 pin
const int WIRE4_PIN = 5;     // Wire 4 pin

int safeWire;                // The wire that does not trigger the alarm

void setup() {
  pinMode(BUZZER_PIN, OUTPUT);

  pinMode(WIRE1_PIN, INPUT_PULLUP);
  pinMode(WIRE2_PIN, INPUT_PULLUP);
  pinMode(WIRE3_PIN, INPUT_PULLUP);
  pinMode(WIRE4_PIN, INPUT_PULLUP);

  randomSeed(analogRead(0));          // Seed the random number generator
  safeWire = random(2, 6);            // Choose a random safe wire: pin 2–5
}

void loop() {
  bool wire1State = digitalRead(WIRE1_PIN);
  bool wire2State = digitalRead(WIRE2_PIN);
  bool wire3State = digitalRead(WIRE3_PIN);
  bool wire4State = digitalRead(WIRE4_PIN);

  if ((safeWire != WIRE1_PIN && wire1State == HIGH) ||
      (safeWire != WIRE2_PIN && wire2State == HIGH) ||
      (safeWire != WIRE3_PIN && wire3State == HIGH) ||
      (safeWire != WIRE4_PIN && wire4State == HIGH)) {
    tone(BUZZER_PIN, 1000); // Unsafe wire cut — alarm!
  } else {
    noTone(BUZZER_PIN);
  }

  delay(500); // Debounce delay
}

  

Notes: