功能：
0.本系统采用STC89C52作为单片机
1.该系统采用的是两个USB小灯作为模拟汽车远光灯和近光灯
2.采用HC-SR04超声波模块模拟汽车障碍物检测系统
3.采用光敏电阻来检测环境光，汽车灯光根据环境光的情况来开启或则关闭车灯
4.采用DC002作为电源接口可直接输入5V给整个系统供电
原理图：
PCB ：
主程序：
#include <reg52.h> //包含头文件，一般情况不需要改动，头文件包含特殊功能寄存器的定义#include <stdio.h>#include "delay.h"//#include "math.h"#define MANUAL 0#define AUTO 1sbit TRIG = P1^0; //出发放超声波sbit ECHO = P1^1; //检测反馈sbit LIGHT_FLAG = P1^2;sbit HIGH_BEAM = P2^2; //远光灯sbit LOW_BEAM = P2^3; //近光灯sbit LED_MANUAL = P2^0; //手动模式指示灯sbit LED_AUTO = P2^1; //自动模式指示灯sbit KEY_CHANGE = P3^7; //远近光灯切换按键sbit KEY_SWITCH = P3^6; //关灯按键sbit KEY_MODE = P3^2; //自动手动切换bit TrigFlag = 0; //触发标志unsigned char LEDFlag = 0; //远近光灯标志float distance = 0; //实际测试距离bit modeFlag = 0; //手动自动模式变量bit switchFlag = 0;bit rekey0;bit rekey1;bit rekey2; //按键防止重复变量void Timer0_Init(); //函数声明void Timer1_Init();void KeyProcess();void main(){TRIG = 0;Timer0_Init(); //定时器0初始化Timer1_Init();HIGH_BEAM = 0;//远光灯LOW_BEAM = 0;//近光灯LED_MANUAL = 0;//手动指示灯LED_AUTO = 0;//自动指示灯DelayS(1);HIGH_BEAM = 1; //远光灯LOW_BEAM = 1; //近光灯LED_MANUAL = 1; //手动灯LED_AUTO = 1; //自动灯while (1) //主循环{if (TrigFlag == 1){TR0 = 0;TrigFlag = 0;TRIG = 1; //启动一次模块//不可以使用其他终端 容易造成死循环DelayUs10x(1);TRIG = 0;while (!ECHO); //当RX为零时等待TR1 = 1; //开启计数while (ECHO); //当RX为1计数并等待TR1 = 0;distance = 1.12 * ((float)TH1 * 256 + TL1) * 17 / 100; //算出来是mm，1.12为系数TH1 = 0;TL1 = 0;TH0 = (65536 - 18432) / 256; //重新赋值 20msTL0 = (65536 - 18432) % 256;TR0 = 1;}if (switchFlag == 1){if (modeFlag == AUTO) //自动模式下{LED_MANUAL = 1;LED_AUTO = 0;if (LIGHT_FLAG == 1) //光照暗{if (distance < 300){LOW_BEAM = 0; //近光灯开HIGH_BEAM = 1; //远光灯关}else{LOW_BEAM = 1; //近光灯关HIGH_BEAM = 0; //远光灯开}}else{LOW_BEAM = 1; //近光灯关HIGH_BEAM = 1; //远光灯关}}else{LED_MANUAL = 0;LED_AUTO = 1;if (LEDFlag == 0){LOW_BEAM = 1; //近光灯关HIGH_BEAM = 1; //远光灯关}else if (LEDFlag == 1){LOW_BEAM = 0; //近光灯开HIGH_BEAM = 1; //远光灯关}else{LOW_BEAM = 1; //近光灯关HIGH_BEAM = 0; //远光灯开}}}else{LOW_BEAM = 1; //近光灯关HIGH_BEAM = 1; //远光灯关//指示灯闪烁，有助于判断程序是否运行LED_MANUAL = 1; LED_AUTO = 1; DelayMs(250);DelayMs(250);LED_MANUAL = 0; LED_AUTO = 0;DelayMs(250);DelayMs(250);}KeyProcess();}}void KeyProcess(){if (switchFlag == 1){if (KEY_MODE == 0) //手动自动切换{DelayMs(10);if (KEY_MODE == 0 && rekey0 == 0){rekey0 = 1;modeFlag = ~modeFlag;}} //切换置位对应灯亮else{rekey0 = 0;}if (modeFlag == MANUAL) //手动模式下{if (KEY_CHANGE == 0) //远光灯切换按键{DelayMs(10);if (KEY_CHANGE == 0 && rekey1 == 0) //远光灯切换按键{rekey1 = 1;if (LEDFlag >= 2){LEDFlag = 1;}else{LEDFlag++;}}}else{rekey1 = 0;}}}if (KEY_SWITCH == 0) //切换按键{DelayMs(10);if (KEY_SWITCH == 0 && rekey2 == 0) //切换按键{rekey2 = 1;switchFlag = ~switchFlag;}}else{rekey2 = 0;}}void Timer0_Init(){TMOD &= 0xF0;TMOD |= 0x01;//使用模式1，16位定时器，使用"|"符号可以在使用多个定时器时不受影响TH0 = (65536 - 18432) / 256; //重新赋值 20msTL0 = (65536 - 18432) % 256;EA = 1; //总中断打开ET0 = 1; //定时器中断打开TR0 = 1; //定时器开关打开}void Timer1_Init(){TMOD &= 0x0F;TMOD |= 0x10;//使用模式1，16位定时器，使用"|"符号可以在使用多个定时器时不受影响TH1 = 0; TL1 = 0;EA = 1; //总中断打开ET1 = 1; //定时器中断打开TR1 = 0; //定时器开关关闭}void Timer0_Interrupt() interrupt 1{static unsigned int cnt = 0;TH0 = (65536 - 18432) / 256; //重新赋值 20msTL0 = (65536 - 18432) % 256;cnt++;if (cnt > 50) //1s定时发出超声波{TrigFlag = 1;cnt = 0;}}void Timer1_Interrupt() interrupt 3{TH1 = 0;TL1 = 0;}
仿真演示视频：
/video/BV1aT411T7aa/
实物演示视频：
/video/BV1MP411p75m/
