本實(shí)驗(yàn)使用的工具：
STM32野火mini開發(fā)板、AHT20溫濕度傳感器、0.96寸OLED顯示屏

一、實(shí)現(xiàn)溫濕度數(shù)據(jù)采集并通過串口顯示

目的：為了查看能否實(shí)現(xiàn)AHT20傳感器的溫濕度采集

具體操作過程請參考小編的另一篇博客：STM32基于I2C的AHT20溫濕度數(shù)據(jù)采集

二、實(shí)現(xiàn)將溫濕度采集數(shù)據(jù)顯示到OLED屏

本過程是基于上面實(shí)現(xiàn)串口顯示的工程上，進(jìn)行OLED屏數(shù)據(jù)顯示代碼的添加。

本實(shí)驗(yàn)完整工程代碼下載詳見參考鏈接。

1.代碼下載

點(diǎn)擊此鏈接進(jìn)行OLED數(shù)據(jù)顯示代碼的下載：
https://github.com/Sunlight-Dazzling/stm32_AHT20_OLED/tree/main/User/usart

下載完成后，添加到之前的工程項(xiàng)目里面

2.部分代碼的編寫

2.1. 顯示溫濕度的代碼

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("溫度:%d%d.%d",T1/100,(T1/10)%10,T1%10);	printf("濕度:%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);   //調(diào)用Sprintf函數(shù)把DHT11的溫度數(shù)據(jù)格式化到字符串?dāng)?shù)組變量strTemp中  	sprintf(strHumi,"%.1f",b);    //調(diào)用Sprintf函數(shù)把DHT11的濕度數(shù)據(jù)格式化到字符串?dāng)?shù)組變量strHumi中  	//printf(strTemp);	//printf("/r/n");	GUI_ShowCHinese(16,00,16,"溫濕度顯示",1);	GUI_ShowCHinese(16,20,16,"溫度",1);	GUI_ShowString(53,20,strTemp,16,1);	GUI_ShowCHinese(16,38,16,"濕度",1);	GUI_ShowString(53,38,strHumi,16,1);	delay_ms(1500);			delay_ms(1500);	delay_ms(1500);	delay_ms(1500);	}

2.2. 添加相應(yīng)的點(diǎn)陣表示代碼
對漢字進(jìn)行取?？梢允褂靡韵骆溄樱ú挥孟螺d字模提取軟件）：https://www.23bei.com/tool-218.html

"溫",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,/*"溫",10*/"濕",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,/*"濕",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*/"顯",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,/*"顯",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函數(shù)

int main(void){		delay_init();	    	       //延時(shí)函數(shù)初始化    	  	uart_init(115200);	 	IIC_Init();		  	NVIC_Configuration(); 	   //設(shè)置NVIC中斷分組2:2位搶占優(yōu)先級，2位響應(yīng)優(yōu)先級 		OLED_Init();			         //初始化OLED  	OLED_Clear(0); 	while(1)	{		read_AHT20_once();		OLED_Clear(0); 		delay_ms(1500);  }}

3.編譯并燒錄

點(diǎn)擊左上角的編譯按鈕進(jìn)行編譯，生成相應(yīng)的.hex文件

打開mcuisp軟件進(jìn)行.hex文件燒錄

4.運(yùn)行結(jié)果

由于還沒有接上AHT20傳感器，故溫濕度顯示為0，另外，采集的速度可以自行進(jìn)行設(shè)置，我這里設(shè)置的采集間隔比較長。

三、小結(jié)

本次實(shí)驗(yàn)在實(shí)現(xiàn)了溫濕度數(shù)據(jù)采集并通過串口顯示和利用OLED屏數(shù)據(jù)顯示代碼的基礎(chǔ)上，完成OLED屏顯示AHT20采集的溫濕度數(shù)據(jù)也并不復(fù)雜，其中，溫濕度數(shù)據(jù)采集的過程使用的是模擬I2C，OLED屏的數(shù)據(jù)顯示采用的是SPI。

四、參考鏈接

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