Microcontroller Projects

photoresistor-interfacing-with-stm32.c

/****************************************************
Dated: 03 November 2018
Property off: www.microcontroller-project.com
Written by  : Usman Ali Butt (usa_butt@hotmail.com)
****************************************************/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f1xx_hal.h"
#include "gpio.h"

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);

int main(void)
{
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 /* Configure the system clock */
  SystemClock_Config();
  /* Initialize all configured peripherals */
  MX_GPIO_Init();

  while (1)
  {
//Check - If their is no light or not sufficient light to break the LDR potential
//Barrier / Photoresistor in Reverse bias 
if(HAL_GPIO_ReadPin(LdrPin_GPIO_Port, LdrPin_Pin)==GPIO_PIN_RESET)  
	HAL_GPIO_WritePin(Bulb_GPIO_Port, Bulb_Pin,GPIO_PIN_SET);      //Switch on the bulb - Activate relay 
	else
//If their is sufficient light and light dependent resistor is conducting than 
//Switch off the bulb	
	HAL_GPIO_WritePin(Bulb_GPIO_Port, Bulb_Pin,GPIO_PIN_RESET);	
  }
}

void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
    /**Configure the Systick interrupt time 
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
    /**Configure the Systick 
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

void _Error_Handler(char *file, int line)
{
  while(1)
  {
  }
}

#ifdef  USE_FULL_ASSERT
#endif /* USE_FULL_ASSERT */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/