52单片机超声波测距并用lcd1602显示
时间: 2023-07-03 22:10:09 浏览: 66
要实现52单片机超声波测距并用lcd1602显示,你需要进行以下步骤:
1. 连接硬件:将超声波测距模块与52单片机相连,并将LCD1602液晶显示屏连接到52单片机的IO口上。
2. 定义IO口:在程序中定义超声波模块和LCD1602显示屏所使用的IO口。
3. 初始化:对超声波模块和LCD1602显示屏进行初始化。
4. 测距:使用超声波模块进行距离测量,并将结果保存下来。
5. 显示:将测量结果显示在LCD1602显示屏上。
以下是一个简单的示例代码,供你参考:
```
#include<reg52.h>
#define LCD_RS P0_0
#define LCD_RW P0_1
#define LCD_EN P0_2
#define LCD_DAT P0
sbit TRIG = P1^0;
sbit ECHO = P1^1;
void delayms(unsigned int ms)
{
unsigned int i, j;
for (i = 0; i < ms; i++)
for (j = 0; j < 123; j++);
}
void lcd_init()
{
LCD_RS = 0;
LCD_RW = 0;
LCD_DAT = 0x38;
LCD_EN = 1;
delayms(5);
LCD_EN = 0;
delayms(5);
LCD_DAT = 0x0c;
LCD_EN = 1;
delayms(5);
LCD_EN = 0;
delayms(5);
LCD_DAT = 0x01;
LCD_EN = 1;
delayms(5);
LCD_EN = 0;
delayms(5);
LCD_DAT = 0x06;
LCD_EN = 1;
delayms(5);
LCD_EN = 0;
delayms(5);
}
void lcd_write_cmd(unsigned char cmd)
{
LCD_RS = 0;
LCD_RW = 0;
LCD_DAT = cmd;
LCD_EN = 1;
delayms(5);
LCD_EN = 0;
delayms(5);
}
void lcd_write_data(unsigned char data)
{
LCD_RS = 1;
LCD_RW = 0;
LCD_DAT = data;
LCD_EN = 1;
delayms(5);
LCD_EN = 0;
delayms(5);
}
void lcd_write_str(unsigned char *str)
{
unsigned char i = 0;
while (str[i] != '\0')
{
lcd_write_data(str[i]);
i++;
}
}
void main()
{
unsigned int distance;
unsigned char str[16];
lcd_init();
while (1)
{
TRIG = 1;
delayms(10);
TRIG = 0;
while (!ECHO);
TH0 = 0;
TL0 = 0;
while (ECHO);
distance = ((unsigned int)TH0 << 8) | TL0;
distance = distance / 58;
lcd_write_cmd(0x80);
sprintf(str, "Distance: %d cm", distance);
lcd_write_str(str);
delayms(1000);
}
}
```
这段代码实现了超声波测距并用LCD1602显示距离的功能。其中,通过定义TRIG和ECHO两个IO口来控制超声波模块的工作,使用定时器来计算超声波的回波时间,从而得出距离。最后,将距离值转换成字符串,并通过lcd_write_str函数将其显示在LCD1602液晶显示屏上。
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