Car Alarm

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    - Project: Car_Alarm
    - Source Code compiled for: Arduino Uno
    - Source Code created on: 2024-11-19 22:09:59
    - Source Code generated by: Alessandro

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Upon powering on, the system must take 10 readings */
    /* from the accelerometer across all three axes (X, */
    /* Y, Z). Compute the average of these readings and */
    /* use it to offset gravity from subsequent periodic */
    /* accelerometer measurements. */
/****** SYSTEM REQUIREMENT 2 *****/
    /* On startup, the car alarm must be disengaged by */
    /* default. If an authorized RFID car is scanned */
    /* using the RFID card reader: 1) enable the car */
    /* alarm it it is currently disabled. 2) Disable the */
    /* car alarm if it is currently enabled. */
/****** SYSTEM REQUIREMENT 3 *****/
    /* When the car alarm is enabled: 1) Periodically */
    /* read the accelerometer measurements. 2) If the */
    /* absolute value of any axis (X, Y, or Z) exceeds a */
    /* predefined threshold (set by calibration), trigger */
    /* the alarm. */
/****** SYSTEM REQUIREMENT 4 *****/
    /* When the alarm is triggered, the relay must */
    /* control the car horn. The relay will toggle the */
    /* car horn ON and OFF for 10 cycles. Each ON/OFF */
    /* cycle must have a delay of 500 milliseconds. */
/****** END SYSTEM REQUIREMENTS *****/


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/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <SPI.h>
#include <MPU6050.h>    //https://github.com/electroniccats/mpu6050
#include <Relay.h>      //https://github.com/rafaelnsantos/Relay
#include <MFRC522.h>    //https://github.com/miguelbalboa/rfid

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void calibrateAccelerometer();
void readAccelerometer();
void checkRFID();
void triggerAlarm();
void controlHorn();

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t accelerometer_MPU6050_Interrupt_PIN_D2        = 2;
const uint8_t card_reader_MFRC522_IRQ_PIN_D5                  = 5;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t car_horn_RelayModule_Signal_PIN_D3              = 3;
const uint8_t card_reader_MFRC522_RST_PIN_D4                   = 4;

/***** DEFINITION OF I2C PINS *****/
const uint8_t accelerometer_MPU6050_I2C_PIN_SDA_A4           = A4;
const uint8_t accelerometer_MPU6050_I2C_PIN_SCL_A5           = A5;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
bool    car_horn_RelayModule_Signal_PIN_D3_rawData           = 0;
bool    card_reader_MFRC522_RST_PIN_D4_rawData               = 0;

/***** DEFINITION OF ACCELEROMETER VARIABLES *****/
MPU6050 accelerometer;
float accelOffset[3] = {0.0, 0.0, 0.0}; // Offset for X, Y, Z axes
bool alarmEnabled = false; // Alarm state
const float threshold = 1.5; // Threshold for triggering alarm

// Create an instance of the MFRC522 class
MFRC522 rfid(card_reader_MFRC522_IRQ_PIN_D5, card_reader_MFRC522_RST_PIN_D4);

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/

void setup(void)
{
    // Initialize pins
    pinMode(accelerometer_MPU6050_Interrupt_PIN_D2, INPUT);
    pinMode(card_reader_MFRC522_IRQ_PIN_D5, INPUT_PULLUP);
    pinMode(car_horn_RelayModule_Signal_PIN_D3, OUTPUT);
    pinMode(card_reader_MFRC522_RST_PIN_D4, OUTPUT);

    // Start the SPI library:
    SPI.begin();

    // Initialize the RFID reader
    rfid.PCD_Init();

    // Initialize the accelerometer
    accelerometer.initialize();
    calibrateAccelerometer();
}

void loop(void)
{
    // Check for RFID
    checkRFID();

    // If alarm is enabled, read accelerometer data
    if (alarmEnabled) {
        readAccelerometer();
    }
}

void calibrateAccelerometer() {
    // Take 10 readings from the accelerometer
    int16_t ax, ay, az;
    for (int i = 0; i < 10; i++) {
        accelerometer.getAcceleration(&ax, &ay, &az);
        accelOffset[0] += ax;
        accelOffset[1] += ay;
        accelOffset[2] += az;
        delay(100);
    }
    // Compute average
    accelOffset[0] /= 10.0;
    accelOffset[1] /= 10.0;
    accelOffset[2] /= 10.0;
}

void readAccelerometer() {
    int16_t ax, ay, az;
    accelerometer.getAcceleration(&ax, &ay, &az);

    // Offset gravity
    ax -= accelOffset[0];
    ay -= accelOffset[1];
    az -= accelOffset[2];

    // Check if any axis exceeds the threshold
    if (abs(ax) > threshold || abs(ay) > threshold || abs(az) > threshold) {
        triggerAlarm();
    }
}

void checkRFID() {
    // Look for a new card
    if (!rfid.PICC_IsNewCardPresent()) {
        return;
    }

    // Select one of the cards
    if (!rfid.PICC_ReadCardSerial()) {
        return;
    }

    // Check if the scanned RFID is authorized (for simplicity, using a specific UID)
    // Replace with actual authorization logic
    byte authorizedUID[] = {0xDE, 0xAD, 0xBE, 0xEF}; // Example UID
    if (memcmp(rfid.uid.uidByte, authorizedUID, sizeof(authorizedUID)) == 0) {
        alarmEnabled = !alarmEnabled; // Toggle alarm state
    }

    // Stop reading the card
    rfid.PICC_HaltA();
}

void triggerAlarm() {
    controlHorn();
}

void controlHorn() {
    for (int i = 0; i < 10; i++) {
        digitalWrite(car_horn_RelayModule_Signal_PIN_D3, HIGH);
        delay(500);
        digitalWrite(car_horn_RelayModule_Signal_PIN_D3, LOW);
        delay(500);
    }
}

/* END CODE */