基于单片机的儿童防丢失系统设计

功能

（1）通过LCD12864显示GPS模块的经纬度数据；

（2）可设定当前的定位位置，自动计算与设定位置的距离，当检测到位置超过设定位置200M时，通过GPRS模块发送报警信息；

（3）报警时通过通过蜂鸣器发出警报；

（4）根据位置自动计算定位的距离，当找到儿童时，成人可主动关闭警报器；

（5）可实现“一一键报警”功能，当按下按键时，主动发送当前的位置给设定的手机号；

（6）当找到儿童时，可手动取消报警。

系统框图

原理图

程序源代码

#include  "project.h"
unsigned char ucMode = 0;
unsigned char xdata Longitude[13] = "E:";  //保存经度数据
unsigned char xdata Latitude[13] = "N:";//保存纬度数据
bit PosSuc = 0;  //定位成功的标志，为1时表示定位成功，为0表示定位不成功
double fLongitude = 0.0;   //保存浮点型数据，经度
double fLatitude = 0.0;    //保存浮点型数据， 纬度


double fLongitudeLoa = 0.0; //当前所在地的经度
double fLatitudeLoa = 0.0;    //当前所在地的纬度


    double Dis = 0.0;  
#define PI                      3.1415926
#define EARTH_RADIUS            6378.004        //地球近似半径
 
// 求弧度
double radian(double d)
{
    return d * PI / 180.0;   //角度1? = π / 180
}
 
//计算距离
double get_distance(double lat1, double lng1, double lat2, double lng2)
{
    xdata double radLat1 = radian(lat1);
    xdata double radLat2 = radian(lat2);
    xdata double a = radLat1 - radLat2;
    xdata double b = radian(lng1) - radian(lng2);
     
    xdata double dst = 2 * asin((sqrt(pow(sin(a / 2), 2) + cos(radLat1) * cos(radLat2) * pow(sin(b / 2), 2) )));
     
    dst = dst * EARTH_RADIUS;
    //dst= round(dst * 10000) / 10000;
    return dst;
}






/*********************************************************************************************************
** 函数名称:      ProcRxBuf
** 函数描述:      处理GPS接收的数据
** 输入参数:      NONE
** 输出参数:      NONE
** 返回值:        NONE
*********************************************************************************************************/
void ProcRxBuf(void)
{
    if(RxFlag == 1)  //数据接收完毕
    {
        
        EA = 0;
        RxFlag = 0;
        
        if(RxBuf[17] == 'A')
        {      
            ucMode = 1;
            if(PosSuc == 0)   //初次定位成功
            {
                
                fLongitudeLoa = fLongitude; //当前所在地的经度
                fLatitudeLoa = fLatitude;    //当前所在地的纬度
                fLongitudeLoa = fLongitude; //当前所在地的经度
                fLatitudeLoa = fLatitude;    //当前所在地的纬度   
                PosSuc = 1;
            }
            LCD_Location(1,0);
            LCD_Display("  GPS 定位成功  ");
            PosSuc = 1;  //定位成功标志置1
            Latitude[0] = 'N';
            Latitude[1] = ':';
            fLatitude = (double)atof(&RxBuf[21]) / (double)60.0 + (RxBuf[19] - 0x30)*10 + (RxBuf[20]- 0x30);
            Latitude[12] = 0;
            Latitude[2] =  (unsigned long)fLatitude %100 / 10 + 0x30;
            Latitude[3] =  (unsigned long)fLatitude % 10+ 0x30;
            Latitude[4] =  '.';
            Latitude[5] =  (unsigned long)(fLatitude * 10) % 10+ 0x30;
            Latitude[6] =  (unsigned long)(fLatitude * 100) % 10+ 0x30;
            Latitude[7] =  (unsigned long)(fLatitude * 1000) % 10+ 0x30;
            Latitude[8] =  (unsigned long)(fLatitude * 10000) % 10+ 0x30;
            Latitude[9] =  (unsigned long)(fLatitude * 100000) % 10+ 0x30;
            Latitude[10] =  (unsigned long)(fLatitude * 1000000) % 10+ 0x30;
            Latitude[11] =  (unsigned long)(fLatitude * 10000000) % 10+ 0x30;
            Latitude[12] = 0;          


            Longitude[0] = 'E';
            Longitude[1] = ':';   
            fLongitude = (double)atof(&RxBuf[34]) / (double)60.0 + (RxBuf[31] - 0x30)*100 + (RxBuf[32]- 0x30) * 10 + (RxBuf[33]- 0x30);
            Longitude[2] =  (unsigned long)fLongitude / 100 + 0x30;
            Longitude[3] =  (unsigned long)fLongitude %100 / 10 + 0x30;
            Longitude[4] =  (unsigned long)fLongitude % 10+ 0x30;
            Longitude[5] =  '.';
            Longitude[6] =  (unsigned long)(fLongitude * 10) % 10+ 0x30;
            Longitude[7] =  (unsigned long)(fLongitude * 100) % 10+ 0x30;
            Longitude[8] =  (unsigned long)(fLongitude * 1000) % 10+ 0x30;
            Longitude[9] =  (unsigned long)(fLongitude * 10000) % 10+ 0x30;
            Longitude[10] =  (unsigned long)(fLongitude * 100000) % 10+ 0x30;
            Longitude[11] =  (unsigned long)(fLongitude * 1000000) % 10+ 0x30;
            Longitude[12] = 0;    
        }
        else
        {
            PosSuc = 0;   //定位成功标志清零
        }
        
        memset(RxBuf,0,80);
        RxWP = 0;
        EA = 1;
    }
}


bit Key1Up = 1;  //按键松开标志，为1时表示按键已经松开，为0时，表示按键未松开
sbit KEY1 = P3^4;  //按键，按下按键时发送定位信息到手机
sbit KEY2 = P3^5;  //按键，按下按键时存储正确的定位信息


/*********************************************************************************************************
** 函数名称:      SendHelp
** 函数描述:      发送求救信息
** 输入参数:      NONE
** 输出参数:      NONE
** 返回值:        NONE
*********************************************************************************************************/
void SendHelp(double Dis)
{
    unsigned char i = 0;
    xdata unsigned char ucTemp[45] = {0};


    for(i = 0; i < 13;i++)
    {
        ucTemp[i] = Latitude[i];
    }
    for(i = 0; i < 13; i++)
    {
        ucTemp[i+12] = Longitude[i];
    }
    strcat(ucTemp,"distance=");
    ucTemp[33] = ((unsigned long)Dis % 100 /  10 + 0x30);
    ucTemp[34] = ((unsigned long)Dis %10 + 0x30);
    ucTemp[35] = ('.');
    ucTemp[36] = ((unsigned long)(Dis * 10) %  10 + 0x30);
    ucTemp[37] = ((unsigned long)(Dis * 100) %  10 + 0x30);
    ucTemp[38] = ((unsigned long)(Dis * 1000) %  10 + 0x30);
    ucTemp[39] = 'k';
    ucTemp[40] = 'm';
    SendSMS(ucTemp,41);  //发送手机短信 
    DelayMs(1000);
    UART1_ClearRxBuf();
}


/*********************************************************************************************************
** 函数名称:      ProcKey
** 函数描述:      处理按键函数，按键按下时发送定位信息到手机
** 输入参数:      NONE
** 输出参数:      NONE
** 返回值:        NONE
*********************************************************************************************************/
void ProcKey1(void)
{    


    if( (Key1Up == 1) && (KEY1 == 0))  //按键处于松开状态时，按键按下,定位完成才判断按键
    {
        DelayMs(20);   //防抖动延时
        if(KEY1 == 0)
        {       
            Key1Up = 0;            
            if(PosSuc == 1)
            {            
                SendHelp(Dis);
            }
            else if(PosSuc == 0)
            {
                LCD_Location(3,0);
                LCD_Display("请等定位成功    ");
                DelayMs(2000);
                LCD_Location(3,0);
                LCD_Display("                ");
            }
        }
    }    
    else if(KEY1 == 1)
    {
        Key1Up = 1;
    }
}