Arduino UNO AR TIMER CODE

#include <avr/wdt.h>  // Include the watchdog timer library

const int button3Pin = 3;  // Pin for Button 3
const int button4Pin = 4;  // Pin for Button 4
const int button2Pin = 2;  // Pin for Button 2
const int button5Pin = 5;  // Pin for Button 5
const int pin9 = 9;        // Pin 9 for the primary output
const int ledPin = 12;     // Pin 12 for the LED

void setup() {
  pinMode(button3Pin, INPUT_PULLUP);  // Button 3
  pinMode(button4Pin, INPUT_PULLUP);  // Button 4
  pinMode(button2Pin, INPUT_PULLUP);  // Button 2
  pinMode(button5Pin, INPUT_PULLUP);  // Button 5
  pinMode(pin9, OUTPUT);              // Pin 9 as output
  pinMode(ledPin, OUTPUT);            // LED on pin 12 as output
}

void loop() {
  // Check if Button 2 is pressed (to reset the Arduino)
  if (digitalRead(button2Pin) == LOW) {
    // Enable the watchdog timer to reset the system
    wdt_enable(WDTO_15MS);  // Set a 15ms timeout, enough to reset the Arduino
    while (true) {
      // Infinite loop, the watchdog will reset the Arduino after 15ms
    }
  }

  // Handle Button 5 (pin 5) behavior:
  if (digitalRead(button5Pin) == LOW) {
    // Button 5 is pressed, blink LED on pin 12 every 0.5 seconds
    digitalWrite(pin9, LOW);  // Reverse signal
    digitalWrite(ledPin, HIGH);
    delay(250);
    digitalWrite(ledPin, LOW);
    delay(250);
  } else {
    // Button 5 is not pressed, turn off LED and set pin 9 HIGH
    digitalWrite(pin9, HIGH);  // Reverse signal
    digitalWrite(ledPin, LOW);
  }

  // If Button 3 is pressed, start the loop to set pin 9 low for 60 seconds, then high for 1 second
  if (digitalRead(button3Pin) == LOW) {
    while (digitalRead(button2Pin) == HIGH) {  // Keep looping until Button 2 is pressed
      digitalWrite(pin9, LOW);  // Reverse signal
      digitalWrite(ledPin, HIGH);  // LED stays ON
      delay(60000);                // 60 seconds
      digitalWrite(pin9, HIGH);  // Reverse signal
      for (int i = 0; i < 2; i++) { // Blink LED every 0.5 seconds during the 1-second HIGH period
        digitalWrite(ledPin, HIGH);
        delay(250);
        digitalWrite(ledPin, LOW);
        delay(250);
      }
    }
  }

  // If Button 4 is pressed, start the loop to set pin 9 low for 4 seconds, then high for 1 second
  if (digitalRead(button4Pin) == LOW) {
    while (digitalRead(button2Pin) == HIGH) {  // Keep looping until Button 2 is pressed
      digitalWrite(pin9, LOW);  // Reverse signal
      digitalWrite(ledPin, HIGH);  // LED stays ON
      delay(4000);                 // 4 seconds
      digitalWrite(pin9, HIGH);  // Reverse signal
      for (int i = 0; i < 2; i++) { // Blink LED every 0.5 seconds during the 1-second HIGH period
        digitalWrite(ledPin, HIGH);
        delay(250);
        digitalWrite(ledPin, LOW);
        delay(250);
      }
    }
  }

  // If no buttons are pressed, keep the LED off
  digitalWrite(ledPin, LOW);
}