The Program's 5 States specification:-

1. Idle state (Starting state): awaiting user action

•  - Active motion detection (No motion detected)
  

•  - Administration authorised usage
  

•  - Ignore RFID input
  

•  - Buzzer alarm OFF
  

•  - Door locked
  

•  - LCD no display (or OFF if we can)
  

2. Input state: receive input from Keypad or from RFID reader

•  - Active motion detection (No motion detected)
  

•  - Administration authorised usage
  

•  - Receiving RFID input
  

•  - Buzzer alarm OFF
  

•  - Door locked
  

•  - LCD prompts for user input
  

•  - Check for correct pass input or prompt for 2 more retrials
  

3. Alert state: the PIR signaled a motion detection

•  - Active motion detection (motion detected)
  

•  - Administration unauthorised usage
  

•  - Receiving RFID input
  

•  - Buzzer alarm ON
  

•  - Door locked
  

•  - LCD displays an Intruder warning message
  

4. Unlock state: the door is unlocked

•  - Disabled motion detection
  

•  - Administration authorised usage
  

•  - Ignore RFID input
  

•  - Buzzer alarm OFF
  

•  - Door Unlocked
  

•  - LCD displays an Unlocked user message
  

5. Admin state:

•  - Disabled motion detection
  

•  - Administration authorised usage
  

•  - Ignore RFID input
  

•  - Buzzer alarm OFF
  

•  - Door Unlocked
  

•  - LCD prompts for #admin options#
  

The Program's State transitions:-

- Idle state --[ '#' (Start) button is pressed ]--> Input state

- Idle state --[ Motion detected from PIR sensor ]--> Alert state

- Input state --[ Correct password input ]--> Unlock state

- Unlock state --[ '*' (Exit) button is pressed ]--> Idle state

- Input state --[ Incorrect password for 3 times ]--> Alert state

- Input state --[ Motion detected from PIR sensor ]--> Alert state

- Alert state --[ Valid admin UID scanned ]--> Admin state

- Admin state --[ '*' (Exit) button is pressed ]--> Idle state

- Input state --[ Idle duration is exceeded with no input ]--> Idle state

- Input state --[ '*' (Exit) button is pressed ]--> Idle state

- Input state --[ Valid admin UID scanned ]--> Admin state