【方案秀】电机转速测量仪

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pythonworld 发布时间：2016-5-12 19:14

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本帖最后由 pythonworld 于 2016-5-12 19:13 编辑

   电机测速仪组成：ST188红外传感器+555施密特触发器+STM32开发板+LCD1602液晶显示屏
基本原理就是用定时器捕获功能测量测速脉冲的周期，然后转化为频率和转速。
主程序：
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();

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

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART2_UART_Init();
  MX_TIM2_Init();

  /* USER CODE BEGIN 2 */

  LCDCOM(0x38);
  LCDCOM(0x0c);
  LCDCOM(0x06);
  LCDCOM(0x01);

  HAL_TIM_Base_Start_IT(&htim2);
  HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
__HAL_TIM_ENABLE_IT(&htim2, TIM_IT_TRIGGER);

  if(HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1) != HAL_OK)
  {
/* Starting Error */
Error_Handler();
  }

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
   HAL_Delay(1200);
   LCDCOM(0x01);
   HAL_Delay(10);
   LCDCOM(0x80);

   if(status)
   {
   status = 0;
      printf("  %6.0f RPM\n",8000000.0/uwIC2Value2*60);
      LCDCOM(0xc0);
      printf("    RUN    \n");

      if(uwIC2Value2<2)
         {
         LCDCOM(0xc0);
         printf("    HIGH    \n");
         }
   }
   else
      {
      LCDCOM(0x80);
      printf("    0 RPM \n");
      LCDCOM(0xc0);
      printf("    STOP    \n");
      }

//    LCDCOM(0x18);

  }
  /* USER CODE END 3 */

}

定时器触发捕获回调函数：
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
//  HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
  uwIC2Value2= HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
  status = 1;

}