Parinaz-SmartCar

Smart Car Central Control Unit (CCU) - Phase 1, 2 & 3

This repository contains the firmware for the Smart Car Central Control Unit (CCU) developed on the STM32F401VETx microcontroller.

🚀 Features

• Non-Blocking Architecture: Elimination of HAL_Delay() to ensure high-frequency responsiveness for button sampling and critical operations.
• Dual-Channel ADC Multiplexing: Dynamic runtime reconfiguration of ADC channels to sample an LDR (Light Dependent Resistor) and an LM35 temperature sensor sequentially without hardware blocking.
• Smart Tunnel Mode (Auto Light): Automatic activation of lights via high-resolution PWM when sudden darkness is detected.
• Hysteresis Cooling Control: Automated cabin ventilation/cooling trigger with built-in thermal hysteresis ($37^\circ\text{C}$ to $40^\circ\text{C}$) to prevent relay/LED chattering.
• Interrupt-Driven Telemetry (Phase 3): Real-time system monitoring over UART. Transmits core temperature, warning LED status, and PWM light levels using non-blocking interrupt routines (HAL_UART_Transmit_IT) at 9600 baud.

📌 Hardware Pinout Configuration

Based on the STM32CubeMX layout, the peripherals are mapped as follows:

Peripheral / Signal	MCU Pin	Mode / Configuration	Description
TIM2_CH1	PA0	PWM Generation	Automatic/Manual Light Intensity Control
ADC1_IN1	PA1	Analog Input (Rank 1)	LDR Sensor for Ambient Light Intensity
ADC1_IN2	PA2	Analog Input (Rank 2)	LM35 Sensor for Core Temperature Tracking
RED_LED	PA3	GPIO Output	Temperature Warning Status Indicator
USART1_TX	PA9	Asynchronous	Serial Telemetry Data Output (9600 Baud)
USART1_RX	PA10	Asynchronous	Serial Receive (Reserved)
BTN_UP	PB0	GPIO Input (Pull-up)	Manual PWM Increment Button
BTN_DOWN	PB1	GPIO Input (Pull-up)	Manual PWM Decrement Button
RCC	PH0 / PH1	Crystal/Ceramic Resonator	Main System Clock Source
SYS	PA13 / PA14	Serial Wire Debug (SWD)	Debugging and Flashing Interface

🛠️ Software Logic Workflow

1. Environmental Sampling (Every 500ms):
   • Writes ADC_ChannelConfTypeDef at runtime to sample ADC_CHANNEL_1 (LM35) then ADC_CHANNEL_2 (LDR).
   • Processes the raw ADC value to extract temperature values using the standard analog voltage transfer function.
2. Telemetry Broadcast (Every 500ms):
   • Packages system state (Temperature, Warn LED ON/OFF, PWM value) into a formatted string buffer.
   • Dispatches data to the Virtual Terminal via UART interrupts, ensuring the main loop continues execution without stalling.
3. Driver Input Polling (Every 200ms):
   • Scans PB0 and PB1 for manual override commands.
   • Adjusts PWM Compare Register values dynamically in steps of 50 units (Max: 1000).

💻 Developed With

• STM32CubeMX (Clock configuration & Peripheral initialization)
• Keil uVision 5 / STM32CubeIDE (Embedded C Firmware)
• Proteus 8.17 (Hardware circuit simulation)

📁 Repository Structure

The project is organized into the following directories:

• firmware/: Contains the full STM32CubeMX configuration (.ioc file), generated HAL drivers, and the Keil MDK-ARM project source code.
• simulation/: Contains the Proteus ISIS circuit schematic and real-time simulation file (.pdsprj).
• docs/: Contains project documentation, phase reports (in Persian), timing diagrams, and sensor datasheets.

👨‍💻 Author

• Parinaz Kari - @ParinazKari