gps定位器是一個被廣泛使用的小工具，說不定你老婆就在你的身上放了一個。這玩意很容易買的到。當然自己做一個也可以，畢竟看這內容的人一般都是單身狗。

需要材料，一款diy界網紅arduino uno，采用8位AVR單片機，自帶bootloader和一大推的支持庫。配合arduino開發環境可以快速簡單的編寫arduino的程序。

一個ICOMSAT擴展板，集成收發短信的sim900模塊

一個GPS shield擴展板

這些都是擴展版，直接堆疊插在一起就好了，第一層是arduino uno（這是廢話），第二層是ICOMSAT擴展板，第三層是GPS shield擴展板。這就是arduino的魅力，擁有大量的周邊擴展模塊，直接連接。讓沒有硬件開發知識人，只要會簡單的c語言就可以玩轉arduino。

首先對ICOMSAT擴展板操作，開關撥到UART的一端，跳線帽按照RXD->D2，TXD->D3如圖，接上GSM天線和插上手機SIM卡。詳細跳帽和引腳請下載查閱產品手冊和原理圖

然后對GPS shield擴展板操作，開關撥到5V，跳線帽按照RXD->D1，TXD->D0如圖連接，接上GPS天線

最后按照順序把三個家伙給堆起來

在編譯程序之前我們需要下載arduino的gsm和gps的支持庫，解壓后放在Arduino\libraries的目錄下

下面是程序代碼復制粘帖過去IDE中，編譯好后下載到arduino中就好了

#include "SIM900.h"

#include

//#include "inetGSM.h"

#include "sms.h"

//#include "call.h"

#include

#include

/* This sample code demonstrates the normal use of a TinyGPS object.

It requires the use of SoftwareSerial, and assumes that you have a

4800-baud serial GPS device hooked up on pins 3(rx) and 4(tx).

*/

TinyGPS gps;

#define ledpin 13

#define pwrkey 27

//**************************************************************************

char sms_rx[122]; //Received text SMS

byte type_sms=SMS_ALL; //Type of SMS

byte del_sms=1; //0: No deleting sms - 1: Deleting SMS

char number_incoming[20];

//**************************************************************************

SMSGSM sms;

int error;

boolean started=false;

bool newData = false;

char gps_year[8];

char gps_mon[3];

char gps_day[3];

char gps_hour[3];

char gps_min[3];

char gps_sec[3];

char gps_lon[20];

char gps_lat[20];

char gps_sms[100];

void setup()

{

//software power sim900 up

pinMode(pwrkey,OUTPUT);

digitalWrite(pwrkey,HIGH);

delay(600);

digitalWrite(pwrkey,LOW);

Serial.begin(115200);

Serial2.begin(9600);

if (gsm.begin(9600)) {

Serial.println("\nstatus=READY");

gsm.forceON(); //To ensure that SIM908 is not only in charge mode

started=true;

} else Serial.println("\nstatus=IDLE");

if(started)

{

//delete all sms message

Serial.println("Deleting SMS");

char error = DeleteAllSMS();

if (error==1)Serial.println("All SMS deleted");

else Serial.println("SMS not deleted");

}

else

{Serial.println("SIM900 NOT EXISTED"); while(1);}

delay(10000);

}

void loop()

{

if(started)

{

check_gps();

Check_SMS();

}

}

void Check_SMS() //Check if there is an sms 'type_sms'

{

char pos_sms_rx; //Received SMS position

pos_sms_rx=sms.IsSMSPresent(type_sms);

if (pos_sms_rx!=0)

{

//Read text/number/position of sms

sms.GetSMS(pos_sms_rx,number_incoming,sms_rx,120);

Serial.print("Received SMS from ");

Serial.print(number_incoming);

Serial.print("(sim position: ");

Serial.print(word(pos_sms_rx));

Serial.println(")");

Serial.println(sms_rx);

if (del_sms==1) //If 'del_sms' is 1, i delete sms

{

error=sms.DeleteSMS(pos_sms_rx);

if (error==1)Serial.println("SMS deleted");

else Serial.println("SMS not deleted");

}

if((strstr(sms_rx,"gps")!=0)&&(strlen(sms_rx)==3))

{

Serial.println("\nsending SMS");

if(newData)

{

if (sms.SendSMS(number_incoming, gps_sms))

Serial.println("\nSMS sent OK");

else

Serial.println("\nSMS sent error");

}

else

{

if (sms.SendSMS(number_incoming, "gps not ready"))

Serial.println("\nSMS sent OK");

else

Serial.println("\nSMS sent error");

}

}

Serial2.flush();

}

newData=false;

return;

}

char check_gps()

{

newData=false;

unsigned long chars;

unsigned short sentences, failed;

// For one second we parse GPS data and report some key values

for (unsigned long start = millis(); millis() - start < 1000;)

{

while (Serial2.available())

{

char c = Serial2.read();

// Serial.write(c); // uncomment this line if you want to see the GPS data flowing

if (gps.encode(c)) // Did a new valid sentence come in?

newData = true;

}

}

if (newData)

{

float flat, flon;

unsigned long age;

int _year;

byte _month, _day,_hour,_minute,_second,_hundredths;

gps.f_get_position(&flat, &flon, &age);

gps.crack_datetime(&_year,&_month,&_day,&_hour,&_minute,&_second,&_hundredths,&age);

flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6;

flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6;

dtostrf(flat, 11, 6, gps_lat);

dtostrf(flon, 10, 6, gps_lon);

strcpy(gps_sms,"lat:");

strcat(gps_sms,gps_lat);

strcat(gps_sms,"\n");

strcat(gps_sms,"lon:");

strcat(gps_sms,gps_lon);

strcat(gps_sms,"\n");

strcat(gps_sms,"time:");

itoa(_year,gps_year,10);

strcat(gps_sms,gps_year);

itoa(_month,gps_mon,10);

if(strlen(gps_mon)==1)

strcat(gps_sms,"0");

strcat(gps_sms,gps_mon);

itoa(_day,gps_day,10);

if(strlen(gps_day)==1)

strcat(gps_sms,"0");

strcat(gps_sms,gps_day);

itoa(_hour,gps_hour,10);

if(strlen(gps_hour)==1)

strcat(gps_sms,"0");

strcat(gps_sms,gps_hour);

itoa(_minute,gps_min,10);

if(strlen(gps_min)==1)

strcat(gps_sms,"0");

strcat(gps_sms,gps_min);

itoa(_second,gps_sec,10);

if(strlen(gps_sec)==1)

strcat(gps_sms,"0");

strcat(gps_sms,gps_sec);

Serial.println(gps_sms);

}

}

char DeleteAllSMS()

{

char ret_val = -1;

if (CLS_FREE != gsm.GetCommLineStatus()) return (ret_val);

gsm.SetCommLineStatus(CLS_ATCMD);

ret_val = 0; // still not present

gsm.SimpleWriteln(F("AT+CMGDA=\"DEL ALL\""));

switch (gsm.WaitResp(8000, 50, "OK")) {

case RX_TMOUT_ERR:

// response was not received in specific time

ret_val = -2;

break;

case RX_FINISHED_STR_RECV:

// OK was received => SMS deleted

ret_val = 1;

break;

case RX_FINISHED_STR_NOT_RECV:

// other response: e.g. ERROR => SMS was not deleted

ret_val = 0;

break;

}

gsm.SetCommLineStatus(CLS_FREE);

return (ret_val);

}

通過9v電池供電或者是充電寶usb供電，把做好的三層不明物體放在開闊的地方，想arduino的手機號碼發送“gps”短信，之后會收到一個回信，內容為

lat:23.036960

lon:114.418800

time:20170919114516

lat表示緯度，lon表示經度，time表示時間，不過是“格林尼治時間”（本初子午線）不是北京時間，和北京時間相差8小時。不會算的回去學地理。

如果你收到“gps not ready”回信，那就是說明沒有搜到gps衛星，等一下或者是換個地方。