Unit 17: Moving Menace

 

 

 

Code : 

 

  #include  // Include the servo library

// Define pin numbers
const int servoPin = 9;    // Pin for servo signal
const int laserPin = 10;   // Pin for laser
const int buttonPin = 2;   // Pin for the push button

Servo myServo;             // Create a servo object

// Variables to track button state
bool buttonPressed = false;
unsigned long buttonPressTime = 0;
const unsigned long holdThreshold = 2000; // 2 seconds delay before action
bool actionTriggered = false;  // Ensures only one action per press

void setup() {
  myServo.attach(servoPin);  
  pinMode(laserPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP); // Enable internal pull-up resistor for button

  digitalWrite(laserPin, LOW); // Start with laser off
  myServo.write(0); // Ensure servo starts at 0 degrees
}

void loop() {
  int buttonState = digitalRead(buttonPin);

  if (buttonState == LOW) { // Button is pressed
    if (!buttonPressed) { 
      buttonPressed = true;
      buttonPressTime = millis(); // Record the time of press
      actionTriggered = false; // Reset action flag for new press
    }
  } else if (buttonPressed) { 
    // Button was released, reset flag but do not trigger action immediately
    buttonPressed = false;
  }

  // If 2 seconds have passed since button press, trigger the action once
  if (buttonPressed && !actionTriggered && millis() - buttonPressTime >= holdThreshold) {
    actionTriggered = true; // Prevent multiple activations per press
    digitalWrite(laserPin, HIGH); // Turn on laser
    moveServo(); // Move servo from 0 to 180 and back
    digitalWrite(laserPin, LOW);  // Turn off laser
  }
}

// Function to move the servo from 0 to 180 and back
void moveServo() {
  for (int pos = 0; pos <= 180; pos += 5) {  
    myServo.write(pos);
    delay(20);
  }
  for (int pos = 180; pos >= 0; pos -= 5) {  
    myServo.write(pos);
    delay(20);
  }
}
  

Code (serial output for troubleshooting): 

  #include  // Include the servo library

// Define pin numbers
const int servoPin = 9;    // Pin for servo signal
const int laserPin = 10;   // Pin for laser
const int buttonPin = 2;   // Pin for the push button

Servo myServo;             // Create a servo object

// Variables to track button state
bool buttonPressed = false;
unsigned long buttonPressTime = 0;
const unsigned long holdThreshold = 2000; // 2 seconds delay before action
bool actionTriggered = false;  // Ensures only one action per press

void setup() {
  Serial.begin(9600); // Start serial communication
  
  myServo.attach(servoPin);  
  pinMode(laserPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP); // Enable internal pull-up resistor for button

  digitalWrite(laserPin, LOW); // Start with laser off
  myServo.write(0); // Ensure servo starts at 0 degrees

  Serial.println("System Ready");
}

void loop() {
  int buttonState = digitalRead(buttonPin);

  if (buttonState == LOW) { // Button is pressed
    if (!buttonPressed) { 
      buttonPressed = true;
      buttonPressTime = millis(); // Record the time of press
      actionTriggered = false; // Reset action flag for new press
      
      Serial.println("Button Pressed");
    }
  } else if (buttonPressed) { 
    // Button was released, reset flag but do not trigger action immediately
    buttonPressed = false;
    Serial.println("Button Released");
  }

  // If 2 seconds have passed since button press, trigger the action once
  if (buttonPressed && !actionTriggered && millis() - buttonPressTime >= holdThreshold) {
    actionTriggered = true; // Prevent multiple activations per press
    Serial.println("2 Seconds Passed - Activating Sequence");

    digitalWrite(laserPin, HIGH); // Turn on laser
    Serial.println("Laser ON");

    moveServo(); // Move servo from 0 to 180 and back

    digitalWrite(laserPin, LOW);  // Turn off laser
    Serial.println("Laser OFF");
  }
}

// Function to move the servo from 0 to 180 and back
void moveServo() {
  Serial.println("Moving Servo: 0 to 180");
  for (int pos = 0; pos <= 180; pos += 5) {  
    myServo.write(pos);
    delay(20);
  }

  Serial.println("Moving Servo: 180 to 0");
  for (int pos = 180; pos >= 0; pos -= 5) {  
    myServo.write(pos);
    delay(20);
  }

  Serial.println("Servo Movement Complete");
}

  

 

 

 

Notes: