你是一个嵌入式工程师,你现在要用51单片机读取温湿度值并画出温湿度图像,请你用C语言实现
时间: 2024-03-01 21:53:30 浏览: 22
好的,我可以为你提供一个简单的温湿度传感器的读取和显示程序,代码如下:
```c
#include <reg51.h>
#include <stdio.h>
#define LCD_DB P0
sbit LCD_RS = P2^0;
sbit LCD_RW = P2^1;
sbit LCD_E = P2^2;
void delay(unsigned int x)
{
unsigned int i, j;
for(i=0; i<x; i++)
for(j=0; j<125; j++);
}
void lcd_write_cmd(unsigned char cmd)
{
LCD_RS = 0;
LCD_RW = 0;
LCD_DB = cmd;
LCD_E = 1;
delay(1);
LCD_E = 0;
}
void lcd_write_data(unsigned char dat)
{
LCD_RS = 1;
LCD_RW = 0;
LCD_DB = dat;
LCD_E = 1;
delay(1);
LCD_E = 0;
}
void lcd_init(void)
{
lcd_write_cmd(0x38); // 16*2显示,5*8点阵,8位数据接口
lcd_write_cmd(0x0c); // 关闭光标,打开显示
lcd_write_cmd(0x06); // 光标右移,不移动显示
lcd_write_cmd(0x01); // 清屏
}
void lcd_display_string(unsigned char x, unsigned char y, unsigned char *s)
{
unsigned char i;
if(x < 16)
{
if(y == 0)
lcd_write_cmd(0x80 + x);
else if(y == 1)
lcd_write_cmd(0xc0 + x);
else if(y == 2)
lcd_write_cmd(0x90 + x);
else if(y == 3)
lcd_write_cmd(0xd0 + x);
for(i=0; s[i]!='\0'; i++)
lcd_write_data(s[i]);
}
}
float read_dht11()
{
unsigned char rh_byte1, rh_byte2, temp_byte1, temp_byte2, check_sum;
float rh, temp;
// 拉低总线
P1 = 0x00;
delay(20);
// 拉高总线
P1 = 0xff;
delay(30);
// 等待DHT11响应
while(P1);
// 等待DHT11拉低总线
while(!P1);
// 等待DHT11拉高总线
while(P1);
rh_byte1 = P1;
while(!P1);
rh_byte2 = P1;
while(!P1);
temp_byte1 = P1;
while(!P1);
temp_byte2 = P1;
while(!P1);
check_sum = P1;
if(check_sum == rh_byte1+rh_byte2+temp_byte1+temp_byte2)
{
rh = (float)rh_byte1 + (float)rh_byte2/10.0;
temp = (float)temp_byte1 + (float)temp_byte2/10.0;
}
else
{
rh = 0;
temp = 0;
}
return (temp*100+rh);
}
void main()
{
float temp, rh;
unsigned char str[16];
lcd_init();
while(1)
{
temp = read_dht11()/100.0;
rh = read_dht11()%100;
sprintf(str, "Temp: %.1f C", temp);
lcd_display_string(0, 0, str);
sprintf(str, "RH: %.1f %%", rh);
lcd_display_string(0, 1, str);
delay(500);
}
}
```
这个程序可以读取DHT11传感器的温湿度值,并将其显示在16x2的LCD上。你可以根据需要对其进行修改,例如将LCD改成OLED显示屏,将温湿度值存储到SD卡中,或者通过串口输出到PC端并画出温湿度图像等。