DHT11温湿度传感器

数据格式

#define DHT_HIGHT HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET)
#define DHT_LOW HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_RESET)
#define DHT_VALUE HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7)
uint8_t datas[5];
void delay_us(uint16_t cnt)
{
    uint8_t i;
    while(cnt)
    {
        for (i = 0; i < 10; i++)
        {
        }
        cnt--;
    }
}
void DHT_GPIO_Init(uint32_t Mode)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    __HAL_RCC_GPIOB_CLK_ENABLE();
    GPIO_InitStruct.Pin = GPIO_PIN_7;
    GPIO_InitStruct.Mode = Mode;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
void DHT11_Start(void)
{
    DHT_GPIO_Init(GPIO_MODE_OUTPUT_PP);
    DHT_HIGHT;
    DHT_LOW;
    HAL_Delay(30);
    DHT_HIGHT;
    DHT_GPIO_Init(GPIO_MODE_INPUT);
    while(DHT_VALUE);
    while(!DHT_VALUE);
    while(DHT_VALUE);
}
void Read_Data_From_DHT()
{
    int i;//轮
    int j;//每一轮读多少次
    char tmp;
    char flag;
    DHT11_Start();
    DHT_GPIO_Init(GPIO_MODE_INPUT);
    for(i= 0;i < 5;i++){
        for(j=0;j<8;j++){
            while(!DHT_VALUE);//等待卡g点
            delay_us(40);
            if(DHT_VALUE == 1){
                flag = 1;
                while(DHT_VALUE);
            }else{
                flag = 0;
            }
        tmp = tmp << 1;
        tmp |= flag;
        }
        datas[i] = tmp;
    }
}
int fputc(int ch, FILE *f)
{
    unsigned char temp[1]={ch};
    HAL_UART_Transmit(&huart1,temp,1,0xffff);
    return ch;
}
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_USART1_UART_Init();
/* USER CODE BEGIN 2 */
    printf("hello world\r\n");
    HAL_Delay(2000);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
//DHT_Get_Temp_Humi_Data(datas);
    Read_Data_From_DHT();
    printf("Temp: %d.%d ", datas[2], datas[3]);
    printf("Humi: %d.%d\r\n", datas[0], datas[1]);
    HAL_Delay(2000);
}
/* USER CODE END 3 */
}