基于STM32的温湿度采集——OLED显示

本过程采用的是STM32野火mini开发板，AHT20温湿度传感器，0.96寸OLED显示屏。

一、实现温湿度通过串口显示

此步骤的目的是为了查看能否实现温湿度的采集

具体操作请参考下面链接
https://blog.csdn.net/qq_43279579/article/details/111597278

二、实现将温湿度采集数据显示到OLED

本过程是基于上面实现串口显示的工程上，进行添加相关OLED的代码。

文件具体内容请参考下面链接进行下载或查看
https://github.com/Sunlight-Dazzling/stm32_AHT20_OLED/tree/main/User/usart
完成添加之后，进行显示部分代码的编写
显示温湿度的代码

void read_AHT20(void)
{
     
	uint8_t   i;
	for(i=0; i<6; i++)
	{
     
		readByte[i]=0;
	}

	//-------------
	I2C_Start();

	I2C_WriteByte(0x71);
	ack_status = Receive_ACK();
	readByte[0]= I2C_ReadByte();
	Send_ACK();

	readByte[1]= I2C_ReadByte();
	Send_ACK();

	readByte[2]= I2C_ReadByte();
	Send_ACK();

	readByte[3]= I2C_ReadByte();
	Send_ACK();

	readByte[4]= I2C_ReadByte();
	Send_ACK();

	readByte[5]= I2C_ReadByte();
	SendNot_Ack();
	//Send_ACK();

	I2C_Stop();

	//--------------
	if( (readByte[0] & 0x68) == 0x08 )
	{
     
		H1 = readByte[1];
		H1 = (H1<<8) | readByte[2];
		H1 = (H1<<8) | readByte[3];
		H1 = H1>>4;

		H1 = (H1*1000)/1024/1024;

		T1 = readByte[3];
		T1 = T1 & 0x0000000F;
		T1 = (T1<<8) | readByte[4];
		T1 = (T1<<8) | readByte[5];

		T1 = (T1*2000)/1024/1024 - 500;

		AHT20_OutData[0] = (H1>>8) & 0x000000FF;
		AHT20_OutData[1] = H1 & 0x000000FF;

		AHT20_OutData[2] = (T1>>8) & 0x000000FF;
		AHT20_OutData[3] = T1 & 0x000000FF;
	}
	else
	{
     
		AHT20_OutData[0] = 0xFF;
		AHT20_OutData[1] = 0xFF;

		AHT20_OutData[2] = 0xFF;
		AHT20_OutData[3] = 0xFF;
		printf("lyy");

	}
	/*通过串口显示采集得到的温湿度
	printf("\r\n");
	printf("温度:%d%d.%d",T1/100,(T1/10)%10,T1%10);
	printf("湿度:%d%d.%d",H1/100,(H1/10)%10,H1%10);
	printf("\r\n");*/
	t=T1/10;
	t1=T1%10;
	a=(float)(t+t1*0.1);
	h=H1/10;
	h1=H1%10;
	b=(float)(h+h1*0.1);
	sprintf(strTemp,"%.1f",a);   //调用Sprintf函数把DHT11的温度数据格式化到字符串数组变量strTemp中  
    sprintf(strHumi,"%.1f",b);    //调用Sprintf函数把DHT11的湿度数据格式化到字符串数组变量strHumi中  
	GUI_ShowCHinese(16,00,16,"温湿度显示",1);
	GUI_ShowCHinese(16,20,16,"温度",1);
	GUI_ShowString(53,20,strTemp,16,1);
	GUI_ShowCHinese(16,38,16,"湿度",1);
	GUI_ShowString(53,38,strHumi,16,1);
	delay_ms(1500);		
	delay_ms(1500);
}

添加相应的点阵字（可以采用取字模的工具进行获取）

	"温",0x00,0x00,0x23,0xF8,0x12,0x08,0x12,0x08,0x83,0xF8,0x42,0x08,0x42,0x08,0x13,0xF8,
  0x10,0x00,0x27,0xFC,0xE4,0xA4,0x24,0xA4,0x24,0xA4,0x24,0xA4,0x2F,0xFE,0x00,0x00,/*"温",0*/
	"度",0x01,0x00,0x00,0x80,0x3F,0xFE,0x22,0x20,0x22,0x20,0x3F,0xFC,0x22,0x20,0x22,0x20,
  0x23,0xE0,0x20,0x00,0x2F,0xF0,0x24,0x10,0x42,0x20,0x41,0xC0,0x86,0x30,0x38,0x0E,/*"度",0*/
	"湿",0x00,0x00,0x27,0xF8,0x14,0x08,0x14,0x08,0x87,0xF8,0x44,0x08,0x44,0x08,0x17,0xF8,
  0x11,0x20,0x21,0x20,0xE9,0x24,0x25,0x28,0x23,0x30,0x21,0x20,0x2F,0xFE,0x00,0x00,/*"湿",0*/
	"显",0x00,0x00,0x1F,0xF0,0x10,0x10,0x10,0x10,0x1F,0xF0,0x10,0x10,0x10,0x10,0x1F,0xF0,
  0x04,0x40,0x44,0x44,0x24,0x44,0x14,0x48,0x14,0x50,0x04,0x40,0xFF,0xFE,0x00,0x00,/*"显",0*/
	"示",0x00,0x00,0x3F,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFE,0x01,0x00,
  0x01,0x00,0x11,0x10,0x11,0x08,0x21,0x04,0x41,0x02,0x81,0x02,0x05,0x00,0x02,0x00,/*"示",0*/

mian函数

#include "delay.h"
#include "usart.h"
#include "bsp_i2c.h"
#include "sys.h"

#include "oled.h"
#include "gui.h"
#include "test.h"

int main(void)
{
     	
	delay_init();	    	       //延时函数初始化    	  
	uart_init(115200);	 
	IIC_Init();
		  
	NVIC_Configuration(); 	   //设置NVIC中断分组2:2位抢占优先级，2位响应优先级 	
	OLED_Init();			         //初始化OLED  
	OLED_Clear(0); 
	while(1)
	{
     
		//printf("温度湿度显示");
		read_AHT20_once();
		OLED_Clear(0); 
		delay_ms(1500);
  }
}

编译烧录得到的结果

采集的速度自己进行设置，我设置的采集的时间间隔比较长，可以自行修改。

三、小结

整个过程只有能够顺利完成串口显示温湿度和利用OLED显示相关文件的工程，完成OLED显示温湿度也并不难。主要是对于得到的数据进行一些类型上的转换和显示位置的设置。其中，温湿度采集的过程是使用的模拟I2C，OLED的显示采用SPI。

四、参考资料

1. 实现DHT11与0.96寸OLED的动态显示
2. 完整工程代码