Components and Peripherals:

STM32 Microcontroller: The core of your system.

Analog Temperature Sensor: Reads the ambient temperature.

LCD Display: Shows the current temperature and mode status.

Relay: Controls an external device based on temperature thresholds.

Buttons:

Mode Selection (Auto/Manual)

Temperature Adjustment (in Manual Mode)

ADC (Analog-to-Digital Converter): Converts analog temperature readings to digital values.

I2C: Communicates with the LCD.

Key Variables:

autoMode: Indicates whether the system is in Auto Mode (1) or not (0).

manualMode: Indicates whether the system is in Manual Mode (1) or not (0).

adcValue: Stores the raw ADC value from the temperature sensor.

nhietdo: Calculated temperature from the ADC value.

dienap: Voltage corresponding to the ADC value.

count: User-set temperature threshold in Manual Mode.

set: Indicates if a temperature has been set in Manual Mode.

Initialization:

System Clock Configuration: Sets up the system clock.

Peripheral Initialization: Initializes GPIO, ADC, I2C, and LCD.

ADC Start: Begins ADC conversion to read temperature data.

LCD Initialization: Prepares the LCD for displaying information.

Main Functionality:

Mode Selection:

Auto Mode is selected by pressing a button connected to GPIO_PIN_12.

Manual Mode is selected by pressing a button connected to GPIO_PIN_15.

Temperature Setting:

In Manual Mode, the user can set a temperature threshold by pressing a button connected to GPIO_PIN_10.

Temperature Reading and Display:

Continuously reads the temperature in both modes.

Displays the current temperature on the LCD.

Relay Control:

In Auto Mode, the relay is activated if the temperature exceeds 45°C.

In Manual Mode, the relay is activated if the temperature exceeds the user-set threshold.

Interrupts:

HAL_GPIO_EXTI_Callback:

Handles button presses to switch modes and set temperature thresholds.

Updates the LCD based on mode changes and temperature settings.

Error Handling:

Error_Handler: Enters an infinite loop if an error occurs, disabling interrupts.

Functions:

SystemClock_Config: Configures the system clock.

MX_GPIO_Init: Initializes GPIO pins.

MX_ADC1_Init: Configures and initializes the ADC.

MX_I2C1_Init: Configures and initializes the I2C for LCD communication.

Main Loop:

In the main loop, the system:

Reads the temperature.

Updates the LCD with the current temperature.

Controls the relay based on the selected mode and temperature readings.

Delays for a short period before repeating.