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， 採用8位AVR單片機， 自帶bootloader和一大推的支援函式庫。 配合arduino開發環境可以快速簡單的編寫arduino的程式。
一個ICOMSAT擴展板， 集成收發短信的sim900模組
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組， 直接連接。 讓沒有硬體開發知識人，
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
然後對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
最後按照順序把三個傢伙給堆起來
在編譯器之前我們需要下載arduino的gsm和gps的支援函式庫， 解壓後放在Arduinolibraries的目錄下
下麵是程式碼複製粘帖過去IDE中， 編譯好後下載到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("status=READY");
gsm.forceON(); //To ensure that SIM908 is not only in charge mode
started=true;
} else Serial.println("status=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("sending SMS");
if(newData)
{
if (sms.SendSMS(number_incoming, gps_sms))
Serial.println("SMS sent OK");
else
Serial.println("SMS sent error");
}
else
{
if (sms.SendSMS(number_incoming, "gps not ready"))
Serial.println("SMS sent OK");
else
Serial.println("SMS 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,"");
strcat(gps_sms,"lon:");
strcat(gps_sms,gps_lon);
strcat(gps_sms,"");
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， 之後會收到一個回信， 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。