51单片机超声波测距l用cd1602显示程序
时间: 2023-08-29 10:07:34 浏览: 37
由于您没有提供具体的超声波测距模块型号,我假设您使用的是HC-SR04超声波模块,并且您已经掌握了51单片机的基本编程知识。以下是一个简单的程序,使用CD1602液晶显示模块显示测量距离。
```
#include <reg52.h>
#include <intrins.h>
#define LCD_RS P2_0
#define LCD_RW P2_1
#define LCD_EN P2_2
#define LCD_DAT P0
sbit TRIG = P1^0;
sbit ECHO = P1^1;
unsigned int distance;
void delay_us(unsigned int us)
{
while(us--)
{
_nop_();
_nop_();
}
}
void delay_ms(unsigned int ms)
{
while(ms--)
{
delay_us(1000);
}
}
void lcd_write_cmd(unsigned char cmd)
{
LCD_RS = 0;
LCD_RW = 0;
LCD_DAT = cmd;
LCD_EN = 1;
delay_us(1);
LCD_EN = 0;
delay_us(50);
}
void lcd_write_data(unsigned char dat)
{
LCD_RS = 1;
LCD_RW = 0;
LCD_DAT = dat;
LCD_EN = 1;
delay_us(1);
LCD_EN = 0;
delay_us(50);
}
void lcd_init()
{
lcd_write_cmd(0x38); // function set: 8-bit, 2-line, 5x8 font
lcd_write_cmd(0x0c); // display on, cursor off, blink off
lcd_write_cmd(0x06); // entry mode set: increment, no shift
lcd_write_cmd(0x01); // clear display
}
void lcd_display(unsigned char row, unsigned char col, unsigned int dat)
{
char buffer[16];
sprintf(buffer, "%u cm", dat);
lcd_write_cmd(0x80 + (row * 0x40) + col);
for(int i = 0; i < 6; i++)
{
lcd_write_data(buffer[i]);
}
}
void main()
{
lcd_init();
while(1)
{
TRIG = 1;
delay_us(10);
TRIG = 0;
while(!ECHO);
TH0 = 0;
TL0 = 0;
while(ECHO);
distance = (unsigned int)(TH0 << 8 | TL0) / 58;
lcd_display(0, 0, distance);
delay_ms(1000);
}
}
```
该程序通过51单片机的P1口与HC-SR04超声波模块相连,使用定时器0测量回波信号的脉宽,并计算出距离。然后将距离显示在CD1602液晶屏幕上。请注意,您需要根据您的具体情况更改程序中的引脚定义和计算距离的公式。