ADC로 전압 표시하기

핀 세팅

• ADC1의 In0 체크하고 Parameters Conversion Mode를 Enable 시킴
  
  
• ADC0의 핀은 CN10 커넥터 29pin에 할당되어있음
• 점퍼선으로 +3.3v CN10 1번 핀과 29번핀 연결
  
  
  

ETH Disable

main.c

printf문 추가

• printf문에 %f 사용하려면 설정 필요
• 프로젝트 우클릭 - Properties - C/C++ Build - Settings
  
  

코딩

#include <stdio.h>

int ADCValue;
float Voltage;

int _write(int file, unsigned char* p, int len)
{
  
  HAL_StatusTypeDef status = HAL_UART_Transmit(&huart3, p, len, 100);
  return (status == HAL_OK ? len : 0);
}

int main()

int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_USART3_UART_Init();
  MX_USB_OTG_FS_PCD_Init();
  /* USER CODE BEGIN 2 */
  __HAL_UART_ENABLE_IT(&huart3, UART_IT_RXNE);
  __HAL_UART_ENABLE_IT(&huart3, UART_IT_TC);
  printf("ADC Program\n\r");

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    HAL_ADC_Start(&hadc1);
    if(HAL_ADC_PollForConversion(&hadc1, 1000000) == HAL_OK)
    {
      ADCValue = HAL_ADC_GetValue(&hadc1);
    }
    printf("ADC = %d\r\n", ADCValue);
    Voltage = 3.3 * ((float)ADCValue / 4095.0);
    printf("Voltage = %f\r\n", Voltage);
    HAL_Delay(500);
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

HAL_Delay 정의

void HAL_Delay(uint32_t Delay)
{
  uint32_t tickstart = HAL_GetTick();

  while((HAL_GetTick() - tickstart) < Delay)
  {

  }
}

Voltage 계산

Tera Term

가변저항 연결