Gate Monitoring System – STM32F401 (Raayan Mini)

A Gate Monitoring System built on STM32F401RBT6 (Raayan Mini).
The system automatically detects entry/exit at a gate, plays time-based greetings, maintains a people count, and helps ensure the gate is properly closed so that street animals or unauthorized persons cannot easily enter when someone forgets to close the gate.

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🧩 Problem Statement

At many institutes, hostels and apartments:

• People open the gate and do not close it properly
• There is no track of how many people entered or exited
• No automatic greeting or time-based behavior
• A half-open gate can allow street animals or intruders to walk inside

This project aims to provide a small embedded solution that:

• Detects entry and exit events using sensors
• Keeps a running people count on an LCD
• Plays Good Morning / Afternoon / Evening / Thank You messages via an external audio controller (UART)
• Uses a gate feedback sensor to support proper gate closing

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🛠 Hardware Overview

• MCU Board: Raayan Mini – STM32F401RBT6 (LQFP64)
• Display: 16x2 HD44780-compatible monochrome LCD (4-bit mode)
• RTC: DS1307 over I²C (device address 0x68) for time & date
• EEPROM: I²C (device address 0x50) to store time slots and volume
• Sensors: Magnetic / limit sensors for gate position and entry/exit detection
• Buttons: 3 push buttons for configuration (increment, decrement, next)
• Status LEDs: Red / Green for basic status indication
• UART: USART2 to gate / audio controller for greetings and control frames

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🔌 Key Pin Connections (STM32F401)

Function	STM32 Pin(s)	Notes
LCD Data (D4–D7)	PB0–PB3	4-bit data bus
LCD RS	PB4	Register select
LCD EN	PB8	Enable
Gate feedback sensor	PA0	Open/close status input (with pull-up)
IR Sensor	PC13	Entry/exit or auxiliary sensor
UP_SW – INC	PC8	Increment value
DN_SW – DEC	PC9	Decrement value
ENT_SW – NEXT	PC10	Next/confirm field
Status LED (Red)	PB13	Error / gate not closed indication
Status LED (Green)	PB14	Normal / OK indication
USART2 TX / RX	PA2 / PA3	To gate / audio controller

RTC (0x68) and EEPROM (0x50) share the same I²C bus of the STM32F4.

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✨ Main Features

• Displays current time and date on a 16x2 LCD
• Detects entry and exit using magnetic / limit sensors
• Maintains and shows total people count
• Sends different greeting commands over UART based on time slot:
  • Morning / Afternoon / Evening greetings
  • “Thank You” for exit
• Uses a gate feedback sensor to assist gate closing logic
• Simple LCD menu with 3 buttons to:
  • Set RTC time & date
  • Configure morning / afternoon / evening time ranges
  • Set volume level (0–30) stored in EEPROM

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📂 Important Source Files

• task.c – Main gate logic, greetings, people count, UART frames
• config.c – RTC time & date setting (LCD + buttons)
• system_config.c – Time slot and volume configuration, helper functions
• LCD.c – 16x2 LCD driver (4-bit mode)
• magnetic.c – Sensor and LED GPIO/EXTI configuration
• SysTickTimer.c – Delay and timing using SysTick
• itoa.c – Small integer-to-string helper for LCD printing

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🛠 Build & Run (Keil µVision)

1. Download the repository as .zip
2. Extract the .zip file.
3. Open the .uvprojx project file in Keil µVision 5.
4. Select device STM32F401RBTx and make sure required Keil Packs are installed.
5. Build the project to generate the firmware image.
6. Flash the firmware to the Raayan Mini board using ST-Link / SWD.

On reset, the system shows a Gate Monitoring welcome message, then displays time and date, and automatically handles greetings, counting and gate closing support when the sensors detect entry or exit.

📸 Demo

🎥 Click the image to watch the Smart Weather Monitor System in action!