Unit 12: Triggered countdown

 

 

 

 

Code for Sketch One: 

 
#include <GyverTM1637.h>
 
// Define pins for TM1637 display
const int CLK_PIN = 3;
const int DIO_PIN = 2;
 
// Define pins for wires
const int WIRE1_PIN = 10, WIRE2_PIN = 11, WIRE3_PIN = 12, WIRE4_PIN = 13;
// Define pin for the buzzer
const int BUZZER_PIN = 8;
 
// Create display object
GyverTM1637 display(CLK_PIN, DIO_PIN);
 
// Variables to manage the countdown timer
int timeRemaining = 120; // Countdown time in seconds (2 minutes)
unsigned long previousMillis = 0;
const long interval = 1000; // Interval for countdown (1 second)
 
// Variable to track if the countdown is running
bool countdownRunning = true;
bool wireCut[4] = {false, false, false, false}; // Track which wires have been cut
 
void setup() {
  // Initialize the display
  display.clear();
  display.brightness(7);
  updateDisplay();
 
  // Initialize pins for wires
  pinMode(WIRE1_PIN, INPUT_PULLUP);
  pinMode(WIRE2_PIN, INPUT_PULLUP);
  pinMode(WIRE3_PIN, INPUT_PULLUP);
  pinMode(WIRE4_PIN, INPUT_PULLUP);
 
  // Initialize pin for the buzzer
  pinMode(BUZZER_PIN, OUTPUT);
}
 
void loop() {
  // Check if the countdown is running
  if (countdownRunning) {
    // Check if it’s time to update the countdown
    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= interval) {
      previousMillis = currentMillis;
 
      timeRemaining--;
      updateDisplay();
 
      // If the time runs out, sound the alarm
      if (timeRemaining <= 0) {
        countdownRunning = false;
        soundAlarm();
      }
    }
  }
 
  // Check the status of the wires
  checkWires();
}
 
// Function to check the status of the wires
void checkWires() {
  if (digitalRead(WIRE1_PIN) == HIGH && !wireCut[0]) {
    soundAlarm();
    wireCut[0] = true;
  } else if (digitalRead(WIRE2_PIN) == HIGH && !wireCut[1]) {
    timeRemaining -= 10;
    if (timeRemaining < 0) timeRemaining = 0;
    updateDisplay();
    wireCut[1] = true;
  } else if (digitalRead(WIRE3_PIN) == HIGH && !wireCut[2]) {
    timeRemaining -= 10;
    if (timeRemaining < 0) timeRemaining = 0;
    updateDisplay();
    wireCut[2] = true;
  } else if (digitalRead(WIRE4_PIN) == HIGH && !wireCut[3]) {
    timeRemaining -= 10;
    if (timeRemaining < 0) timeRemaining = 0;
    updateDisplay();
    wireCut[3] = true;
  }
}
 
// Function to update the display
void updateDisplay() {
  int minutes = timeRemaining / 60;
  int seconds = timeRemaining % 60;
  display.display(0, minutes / 10);    // Tens of minutes
  display.display(1, minutes % 10);    // Ones of minutes
  display.display(2, seconds / 10);    // Tens of seconds
  display.display(3, seconds % 10);    // Ones of seconds
  display.point(1); // Display the colon
}
 
// Function to sound the alarm
void soundAlarm() {
  digitalWrite(BUZZER_PIN, HIGH);
  delay(3000); // Sound the alarm for 3 seconds
  digitalWrite(BUZZER_PIN, LOW);
}
 
  

Code for Sketch Two:

 
 
#include <GyverTM1637.h>
 
// Define pins for the display, wires and buzzer
const int WIRE1_PIN = 10, WIRE2_PIN = 11, WIRE3_PIN = 12, WIRE4_PIN = 13, BUZZER_PIN = 8, CLK_PIN = 3, DIO_PIN = 2;
 
// Create display object
GyverTM1637 display(CLK_PIN, DIO_PIN);
 
int timeRemaining = 120; // Countdown time in seconds (2 minutes)
unsigned long previousMillis = 0;
const long interval = 1000; // Interval for countdown (1 second)
bool countdownRunning = true;
bool wireCut[4] = {false, false, false, false};
 
// Random safe wire variable
int safeWire;
 
void setup() {
  // Initialize random seed
  randomSeed(analogRead(0));
 
  // Select a random safe wire
  safeWire = random(1, 5); // Random number between 1 and 4
 
  // Initialize the display
  display.clear();
  display.brightness(7);
  updateDisplay();
 
  // Initialize pins for wires
  pinMode(WIRE1_PIN, INPUT_PULLUP);
  pinMode(WIRE2_PIN, INPUT_PULLUP);
  pinMode(WIRE3_PIN, INPUT_PULLUP);
  pinMode(WIRE4_PIN, INPUT_PULLUP);
 
  // Initialize pin for the buzzer
  pinMode(BUZZER_PIN, OUTPUT);
}
void loop() {
  if (countdownRunning) {
    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= interval) {
      previousMillis = currentMillis;
      timeRemaining--;
      updateDisplay();
 
      // If the time runs out, sound the alarm
      if (timeRemaining <= 0) {
        countdownRunning = false;
        soundAlarm();
      }
    }
  }
 
  checkWires();
 
}
void checkWires() {
  if (digitalRead(WIRE1_PIN) == HIGH && !wireCut[0]) {
    if (safeWire == 1) {
      countdownRunning = false;
    } else {
      timeRemaining -= 10;
      if (timeRemaining < 0) timeRemaining = 0;
    }
    updateDisplay();
    wireCut[0] = true;
  } else if (digitalRead(WIRE2_PIN) == HIGH && !wireCut[1]) {
    if (safeWire == 2) {
      countdownRunning = false;
    } else {
      timeRemaining -= 10;
      if (timeRemaining < 0) timeRemaining = 0;
    }
    updateDisplay();
    wireCut[1] = true;
  } else if (digitalRead(WIRE3_PIN) == HIGH && !wireCut[2]) {
    if (safeWire == 3) {
      countdownRunning = false;
    } else {
      timeRemaining -= 10;
      if (timeRemaining < 0) timeRemaining = 0;
    }
    updateDisplay();
    wireCut[2] = true;
  } else if (digitalRead(WIRE4_PIN) == HIGH && !wireCut[3]) {
    if (safeWire == 4) {
      countdownRunning = false;
    } else {
      timeRemaining -= 10;
      if (timeRemaining < 0) timeRemaining = 0;
    }
    updateDisplay();
    wireCut[3] = true;
  }
}
void updateDisplay() {
  int minutes = timeRemaining / 60;
  int seconds = timeRemaining % 60;
  display.display(0, minutes / 10);    // Tens of minutes
  display.display(1, minutes % 10);    // Ones of minutes
  display.display(2, seconds / 10);    // Tens of seconds
  display.display(3, seconds % 10);    // Ones of seconds
  display.point(1); // Display the colon
}
// Function to sound the alarm
void soundAlarm() {
  digitalWrite(BUZZER_PIN, HIGH);
  delay(3000); // Sound the alarm for 3 seconds
  digitalWrite(BUZZER_PIN, LOW);
}
    

 

Notes: