检测声音强度，显示大概的分贝数在oled上，不同强度下舵机转不同的角度
1、项目简介
2、实现逻辑
#通过STM32的adc检测大概声音强度
#在oled上显示声音强度
#舵机根据声音大小转动
3、应用场景
#益智小玩具（听到声音自动转头的小猫模型）
4、核心代码梳理
int main(void)
{
/* USER CODE BEGIN 1 */
uint32_t clk;
uint8_t pwm;
/* 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_I2C1_Init();
MX_ADC1_Init();
MX_TIM1_Init();
/* USER CODE BEGIN 2 */
OLED_Init(); //初始化OLED
OLED_Clear();
OLED_ShowString(0,3,"SOUND: . DB",16);
// OLED_ShowNum(52,3,123,3,16);
// OLED_ShowNum(88,3,13,2,16);
HAL_ADC_Start_IT(&hadc1);
HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);
__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1, 90);
HAL_Delay(500);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_Delay(2);
HAL_ADC_Start_IT(&hadc1);
if(clk%250 == 0)
{
HAL_GPIO_TogglePin(GPIOC, LED_Pin);
db = 0;
for(uint8_t i=0; i<50; i++)
{
db += (ADC_temp[i]/10);
}
db = db/5;
if(DB < 30)
DB = db*0.5;
if(DB<40)
DB = db*1.5;
else if(DB < 50)
DB = db*1.5;
else DB = db*2;
DB = DB*1.5;
if((DB >= 0) && (DB <= 200))
{
intDB = (int)DB;
float DB_tmp = DB - intDB;
DB_tmp *= 100;
decDB = DB_tmp;
OLED_ShowNum(52,3,intDB,3,16);
OLED_ShowNum(88,3,decDB,2,16);
if(DB >= 60)
{
if(pwm < 110)
{
for(uint8_t i=0; i<30; i++)
{
pwm = 90 + i;
__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1, pwm);
HAL_Delay(8);//2400/30=8
}
HAL_Delay(5000);
}
}
else
{
if(pwm > 100)
{
for(uint8_t i=0; i<30; i++)
{
pwm = 120-i;
__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1, pwm);
HAL_Delay(8);//1000/25=4
}
}
}
}
}
clk++;
}
/* USER CODE END 3 */
}
5、部分参考资料
无
6、注意事项
#舵机选360度的
#声音检测模块是现成的，不过不是特别准，而且感觉只对某个频率范围内的声音有检测
