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pm:prj2026:theodor_ioan.buliga:bianca.buga [2026/05/11 00:35] bianca.buga |
pm:prj2026:theodor_ioan.buliga:bianca.buga [2026/05/26 00:03] (current) bianca.buga |
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| This project implements a password-protected alarm system using the Arduino Nano ATmega328P board. | This project implements a password-protected alarm system using the Arduino Nano ATmega328P board. | ||
| - | * **What it does:** The system activates a passive buzzer alarm that can only be silenced by entering the correct password via push buttons. A green LED confirms a correct entry, while a red LED and an intensified alarm sound signal an incorrect attempt. A reset button and an LCD display are also integrated. | + | * **What it does:** When triggered (via a start button or a PIR motion sensor), a 30-second countdown begins and the passive buzzer starts beeping. The alarm can only be silenced by entering the correct 4-digit password via 4 push buttons. A green LED and a success jingle confirm correct entry, while a red LED and a continuous alarm signal a wrong attempt. The system also controls a servo motor acting as a physical door lock, stores the password persistently in the internal EEPROM (survives power cycles), and allows secure in-system password changes. A 16x2 I2C LCD and UART serial output provide real-time status feedback. |
| + | * **Key features:** Password-protected alarm, PIR motion detection with arming delay, servo door lock, EEPROM password persistence, 4-state FSM, UART debug output. | ||
| </note> | </note> | ||
| ===== General Description ===== | ===== General Description ===== | ||
| - | The system is structured around the following hardware and software modules: | + | The system is structured around a **4-state Finite State Machine (FSM)** running on the ATmega328P. All peripherals are driven using direct register manipulation. |
| + | |||
| **Hardware Modules:** | **Hardware Modules:** | ||
| - | * **ATmega328P X-Mini** — the central processing unit | + | * **ATmega328P (Arduino Nano)** — central processing unit, 16 MHz, 5V |
| - | * **Passive Buzzer** — driven by PWM (Timer1) to produce variable-frequency alarm tones | + | * **PIR Sensor (HC-SR501)** — motion detection for automatic arming |
| - | * **Push Buttons (4x)** — used to input the password digits (e.g. a 4-button combination lock) | + | * **Servo Motor SG90** — actuates the physical door lock mechanism (PC0) |
| - | * **Reset Button** — triggers a software or hardware reset of the system state | + | * **Passive Buzzer** — variable-frequency acoustic feedback via GPIO toggle (PD7) |
| - | * **Green LED** — indicates correct password entry | + | * **4x Password Buttons** — 4-digit code input (PD3, PD4, PB0, PB1) |
| - | * **Red LED** — indicates wrong password entry | + | * **Start/Reset Button** — alarm trigger and system reset (PD2) |
| - | * **16x2 LCD Display ** — displays system status messages | + | * **Arming Button** — PIR sensor arm/disarm toggle (PB4) |
| + | * **Password Change Button** — enters secure password-change mode (PC1) | ||
| + | * **Green LED** — correct password / system disarmed indicator (PD5) | ||
| + | * **Red LED** — active alarm indicator (PD6) | ||
| + | * **PIR Status LED** — visual indicator when PIR is armed (PB2) | ||
| + | * **16x2 LCD (HD44780 + PCF8574 I2C adapter)** — real-time status messages (A4/A5) | ||
| **Bill of Materials:** | **Bill of Materials:** | ||
| Line 92: | Line 98: | ||
| | A5 | I/O (SCL) | J1 (LCD I2C) | I2C clock line | | | A5 | I/O (SCL) | J1 (LCD I2C) | I2C clock line | | ||
| ===== Results ===== | ===== Results ===== | ||
| + | {{:pm:prj2026:theodor_ioan.buliga:bb.png}} | ||
| ===== Conclusions ===== | ===== Conclusions ===== | ||
