【蓝桥杯嵌入式笔记】（十六）DHT11

一、原理图

二、CubeMX配置

PA7接上HDQ

三、代码

移植底层代码，将延迟修改

加上读取函数

float DHT11_H;
float DHT11_T;

void dht11_read()
{
	unsigned char data[5];
	int j=5000;
	
	outDQ(0);
	HAL_Delay(20);
	outDQ(1);
	usDelay(30);
	inDQ();
	while(!HAL_GPIO_ReadPin(GPIOA,HDQ)&&(j--));	
	j=5000;
	while(HAL_GPIO_ReadPin(GPIOA,HDQ)&&(j--));	
	
	data[0]=recData();
	data[1]=recData();
	data[2]=recData();
	data[3]=recData();
	data[4]=recData();
	outDQ(1);
	
	if((data[0]+data[1]+data[2]+data[3])==data[4])
	{
		DHT11_H=data[0]+data[1]/10.0;
		DHT11_T=data[2]+data[3]/10.0;
	}
}

 .h也修改一下

void dht11_read(void);

代入主函数

extern float DHT11_H;
extern float DHT11_T;

void project()
{
	led_pro();
	lcd_pro();
	dht11_read();
}

	sprintf(text," h:%0.2f%%  t:%0.2f ",DHT11_H,DHT11_T);
	LCD_DisplayStringLine(Line6, (unsigned char *)text);