基于51单片机的温湿度检测代码
时间: 2023-08-26 17:04:58 浏览: 60
下面是一个简单的基于51单片机的温湿度检测代码,使用DHT11传感器来获取温湿度数据:
```c
#include <reg51.h>
#include <stdio.h>
#define DHT11_PIN P1_0
void delay(unsigned int t)
{
unsigned int i, j;
for (i = 0; i < t; i++)
{
for (j = 0; j < 100; j++);
}
}
void send_start_signal()
{
DHT11_PIN = 0;
delay(18);
DHT11_PIN = 1;
delay(30);
}
int read_response()
{
unsigned int i, timeout;
timeout = 10000;
while (DHT11_PIN && timeout);
if (timeout == 0)
{
return -1;
}
timeout = 10000;
while (!DHT11_PIN && timeout);
if (timeout == 0)
{
return -1;
}
timeout = 10000;
while (DHT11_PIN && timeout);
if (timeout == 0)
{
return -1;
}
return 0;
}
unsigned char read_byte()
{
unsigned char i, data = 0;
for (i = 0; i < 8; i++)
{
while (!DHT11_PIN);
delay(30);
if (DHT11_PIN)
{
data |= (1 << (7 - i));
}
while (DHT11_PIN);
}
return data;
}
void main()
{
unsigned char hum, temp, checksum;
while (1)
{
send_start_signal();
if (read_response() == -1)
{
printf("Error: No response from sensor.");
continue;
}
hum = read_byte();
temp = read_byte();
checksum = read_byte();
if (checksum != hum + temp)
{
printf("Error: Checksum error.");
continue;
}
printf("Humidity = %d%%, Temperature = %dC", hum, temp);
delay(1000);
}
}
```
这段代码使用了DHT11_PIN作为传感器数据引脚,使用了delay函数来生成延时等待,从而获取到温湿度数据。需要注意的是,DHT11传感器的数据读取需要按照一定的时序和规则进行,否则可能会读取出错误的数据。因此,这段代码中的时序和规则需要严格遵守。