51单片机lcd1602显示温度

以下是51单片机LCD1602显示温度的代码示例：

#include <reg51.h>
#include <stdio.h>

#define LCD_RS P2_0
#define LCD_RW P2_1
#define LCD_E  P2_2
#define LCD_DAT P0

void delay(unsigned int t) //延时函数
{
    unsigned int i, j;
    for (i = t; i > 0; i--)
        for (j = 10; j > 0; j--);
}

void lcd_write_cmd(unsigned char cmd) //写命令
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_DAT = cmd;
    delay(5);
    LCD_E = 1;
    delay(5);
    LCD_E = 0;
    delay(5);
}

void lcd_write_data(unsigned char dat) //写数据
{
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_DAT = dat;
    delay(5);
    LCD_E = 1;
    delay(5);
    LCD_E = 0;
    delay(5);
}

void lcd_init() //LCD初始化
{
    lcd_write_cmd(0x38);
    lcd_write_cmd(0x08);
    lcd_write_cmd(0x01);
    lcd_write_cmd(0x06);
    lcd_write_cmd(0x0c);
}

void lcd_show_string(unsigned char x, unsigned char y, unsigned char *str) //在指定位置显示字符串
{
    unsigned char i;
    if (x < 16)
    {
        if (y == 0)
            lcd_write_cmd(0x80 + x);
        else
            lcd_write_cmd(0x80 + 0x40 + x);
    }
    i = 0;
    while (str[i] != '\0')
    {
        lcd_write_data(str[i]);
        i++;
    }
}

void ds18b20_init() //DS18B20温度传感器初始化
{
    unsigned char i;
    LCD_DAT = 0;
    delay(200);
    LCD_DAT = 1;
    delay(20);
    i = LCD_DAT;
    delay(200);
}

void ds18b20_write(unsigned char dat) //写一个字节
{
    unsigned char i;
    for (i = 0; i < 8; i++)
    {
        LCD_DAT = 0;
        delay(5);
        LCD_DAT = dat & 0x01;
        delay(5);
        LCD_DAT = 1;
        dat >>= 1;
    }
}

unsigned char ds18b20_read() //读一个字节
{
    unsigned char i, dat = 0;
    for (i = 0; i < 8; i++)
    {
        LCD_DAT = 0;
        delay(5);
        LCD_DAT = 1;
        delay(5);
        dat >>= 1;
        if (LCD_DAT)
            dat |= 0x80;
    }
    return dat;
}

void ds18b20_convert() //启动温度转换
{
    ds18b20_init();
    ds18b20_write(0xcc);
    ds18b20_write(0x44);
}

void main()
{
    unsigned char str[16];
    float temp;
    lcd_init();
    while (1)
    {
        ds18b20_convert();
        ds18b20_init();
        ds18b20_write(0xcc);
        ds18b20_write(0xbe);
        temp = ds18b20_read() / 2.0;
        sprintf(str, "TEMP:%.1f", temp);
        lcd_show_string(0, 0, str);
        delay(500);
    }
}

这个代码使用了DS18B20温度传感器来获取温度值，并将其显示在LCD1602上。你可以根据自己的需要修改代码。注意，在使用这个代码之前，你需要了解51单片机的基本编程知识。