求单片机温湿度报警运行代码

Question

单片机 STC89C52，SHT11温湿度主要实现温湿度采集、温湿度显示和播报、温湿度的判断、报警电路的启动等功能。

Answer 1

以下是简单的基于STC89C52单片机和SHT11温湿度传感器的温湿度报警运行代码的示例。

c
#include <reg52.h>
#include <intrins.h>

sbit SDA = P2^0; // SHT11数据线
sbit SCK = P2^1; // SHT11时钟线
sbit ALARM = P2^2; // 报警输出

unsigned char TempData_H, TempData_L, HumiData_H, HumiData_L;

void Delay_Nus(unsigned int t)
{
while(t--)
_nop_();
}

void Start_SHT11(void)
{
SDA = 1;
Delay_Nus(1);
SCK = 1;
Delay_Nus(1);
SDA = 0;
Delay_Nus(1);
SCK = 0;
Delay_Nus(1);
SCK = 1;
Delay_Nus(1);
SDA = 1;
Delay_Nus(1);
SCK = 0;
}

bit Check_Ack(void)
{
bit ack;
SDA = 1;
Delay_Nus(1);
SCK = 1;
Delay_Nus(1);
ack = SDA;
SCK = 0;
Delay_Nus(1);
return ack;
}

void Write_Byte(unsigned char dat)
{
unsigned char i;
for(i=0; i<8; i++)
{
SDA = dat & 0x80;
dat <<= 1;
Delay_Nus(1);
SCK = 1;
Delay_Nus(1);
SCK = 0;
}
Check_Ack();
}

unsigned char Read_Byte(void)
{
unsigned char i, dat = 0;
SDA = 1;
for(i=0; i<8; i++)
{
SCK = 1;
Delay_Nus(1);
dat = (dat << 1) | SDA;
SCK = 0;
Delay_Nus(1);
}
return dat;
}

void Read_Data(void)
{
Start_SHT11();
Write_Byte(0x04); // 温湿度采集命令
while(!Check_Ack());
Delay_Nus(20);
Start_SHT11();
Write_Byte(0x03); // 读取数据命令
while(!Check_Ack());
TempData_H = Read_Byte();
Write_Byte(0xFF);
TempData_L = Read_Byte();
Write_Byte(0xFF);
HumiData_H = Read_Byte();
Write_Byte(0xFF);
HumiData_L = Read_Byte();
Check_Ack();
}

void main(void)
{
while(1)
{
Read_Data();
if(TempData_H > 30) // 设置温度报警阈值
{
ALARM = 1; // 触发报警
}
else
{
ALARM = 0; // 关闭报警
}
}
}
你需要根据实际硬件和需求进行修改和优化。