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本实验使用的工具：
STM32野火mini开发板、AHT20温湿度传感器、0.96寸OLED显示屏

一、实现温湿度数据采集并通过串口显示

目的：为了查看能否实现AHT20传感器的温湿度采集

具体操作过程请参考小编的另一篇博客：STM32基于I2C的AHT20温湿度数据采集

二、实现将温湿度采集数据显示到OLED屏

本过程是基于上面实现串口显示的工程上，进行OLED屏数据显示代码的添加。

本实验完整工程代码下载详见参考链接。

1.代码下载

点击此链接进行OLED数据显示代码的下载：
https://github.com/Sunlight-Dazzling/stm32_AHT20_OLED/tree/main/User/usart

下载完成后，添加到之前的工程项目里面

2.部分代码的编写

2.1. 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");
	}
	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  
	//printf(strTemp);
	//printf("/r/n");
	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);
	delay_ms(1500);
	delay_ms(1500);	
}

2.2. 添加相应的点阵表示代码
对汉字进行取模可以使用以下链接（不用下载字模提取软件）：https://www.23bei.com/tool-218.html

"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",10*/
"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",12*/
"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",11*/
"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",13*/
"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",14*/

2.3. main函数

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)
	{
		read_AHT20_once();
		OLED_Clear(0); 
		delay_ms(1500);
  }
}

3.编译并烧录

点击左上角的编译按钮进行编译，生成相应的.hex文件

打开mcuisp软件进行.hex文件烧录

4.运行结果

由于还没有接上AHT20传感器，故温湿度显示为0，另外，采集的速度可以自行进行设置，我这里设置的采集间隔比较长。

三、小结

本次实验在实现了温湿度数据采集并通过串口显示和利用OLED屏数据显示代码的基础上，完成OLED屏显示AHT20采集的温湿度数据也并不复杂，其中，温湿度数据采集的过程使用的是模拟I2C，OLED屏的数据显示采用的是SPI。

四、参考链接

1.https://blog.csdn.net/qq_43279579/article/details/111678857
2.https://blog.csdn.net/qq_54496810/article/details/121426752
3.完整工程代码
提取码：1234