aht

基于STM32的OLED屏显⽰AHT20采集的温湿度数据

⽂章⽬录

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：

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

2.部分代码的编写

2.1.显⽰温湿度的代码

voidread_AHT20(void)

{

uint8_ti;

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;

}

el

{

AHT20_OutData[0]=0xFF;

AHT20_OutData[1]=0xFF;

AHT20_OutData[2]=0xFF;

AHT20_OutData[3]=0xFF;

printf("lyy");

}

printf("rn");

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("rn");

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_ShowCHine(16,00,16,"温湿度显⽰",1);

GUI_ShowCHine(16,20,16,"温度",1);

GUI_ShowString(53,20,strTemp,16,1);

GUI_ShowCHine(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);

}

"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*/

函数

intmain(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