SensorTile.box声音控制LED亮度

littleshrimp

SensorTile.box声音控制LED亮度 [复制链接]

本帖最后由 littleshrimp 于 2020-2-28 19:56 编辑

原理比较简单使用ADC采集麦克风数据做峰峰值计算后控制PWM输出调节LED亮度

VID_20200228_160307.mp4 (5.6 MB, 下载次数: 15)

工程使用STM32CubeMX创建，核心代码如下：

/* USER CODE BEGIN 0 */
uint16_t vpp(uint16_t *buf,uint16_t len)
{
  uint16_t max = 0;
  uint16_t min = 4095;
  for(int i=0;i<len;i++)
  {
    if(buf[i] > max)max = buf[i];
    if(buf[i] < min)min = buf[i];
  }
  return max - min;
}
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
{
  half_flag = 1;
}
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{
  cplt_flag = 1;
}
/* USER CODE END 0 */

/**
  * [url=home.php?mod=space&uid=159083]@brief[/url]  The application entry point.
  * @retval int
  */
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_DMA_Init();
  MX_ADC1_Init();
  MX_DFSDM1_Init();
  MX_I2C1_Init();
  MX_I2C3_Init();
  MX_RTC_Init();
  MX_SDMMC1_SD_Init();
  MX_SPI1_Init();
  MX_SPI2_Init();
  MX_SPI3_Init();
  MX_TIM2_Init();
  MX_TIM6_Init();
  MX_TIM7_Init();
  MX_TIM15_Init();
  MX_FATFS_Init();
  MX_USB_DEVICE_Init();
  /* USER CODE BEGIN 2 */
  
  HAL_TIM_PWM_Start(&htim15, TIM_CHANNEL_2);
  HAL_ADC_Start_DMA(&hadc1,(uint32_t*)adc_buf,ADC_BUF_COUNT);
  /* USER CODE END 2 */
 
 

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
      if(half_flag)
      {
        half_flag = 0;
        dutyCycle = vpp(adc_buf, ADC_BUF_COUNT/2);
        __HAL_TIM_SET_COMPARE(&htim15, TIM_CHANNEL_2, dutyCycle);
      }
      if(cplt_flag)
      {
        cplt_flag = 0;
        dutyCycle = vpp(&adc_buf[ADC_BUF_COUNT/2], ADC_BUF_COUNT/2);
        __HAL_TIM_SET_COMPARE(&htim15, TIM_CHANNEL_2, dutyCycle);
      }
    /* USER CODE END WHILE */

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

工程文件：

7.box_adc_pwm_led.rar (10.98 MB, 下载次数: 52)

yujie2510

感谢分享，很棒的学习资料

SensorTile.box声音控制LED亮度 [复制链接]

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