Alex Merchen
Published

Cat Tracker with Linkit One

Using the Linkit One and an LED, I created a system to always find my cat.

EasyShowcase (no instructions)1,365
Cat Tracker with Linkit One

Things used in this project

Hardware components

LinkIt ONE
MediaTek Labs LinkIt ONE
×1
3 mm LED: Green
3 mm LED: Green
×1
Resistor 100 ohm
Resistor 100 ohm
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Cat
Cat Body Harness

Story

Read more

Schematics

Overall Circuit

It is the standard setup for the Linkit One, the only addition is the LED in series with a resistor that connects from pin 13 to ground.
Img 20151203 125441698

Code

Cat Tracker Code

Arduino
//#include <b64.h>
#include <HttpClient.h>
#include <LTask.h>
#include <LWiFi.h>
#include <LWiFiClient.h>
#include <LDateTime.h>
#define WIFI_AP "Wifi Network Name"
#define WIFI_PASSWORD "wifi password"
#define WIFI_AUTH LWIFI_WPA  // choose from LWIFI_OPEN, LWIFI_WPA, or LWIFI_WEP.
#define per 50
#define per1 3
#define DEVICEID "device ID from mediatek" // Input your deviceId
#define DEVICEKEY "device key from mediatek" // Input your deviceKey
#define SITE_URL "api.mediatek.com"
#include <LGPS.h>
double latitude, longitude;
int tmp;
char* x;
gpsSentenceInfoStruct info;
char buff[256];

LWiFiClient c;
unsigned int rtc;
unsigned int lrtc;
unsigned int rtc1;
unsigned int lrtc1;
char port[4]={0};
char connection_info[21]={0};
char ip[21]={0};             
int portnum;
int val = 0;
String tcpdata = String(DEVICEID) + "," + String(DEVICEKEY) + ",0";
String upload_led;
String tcpcmd_led_on = "LED_Control,1";
String tcpcmd_led_off = "LED_Control,0";

LWiFiClient c2;
HttpClient http(c2);

void setup()
{
  
  LTask.begin();
  LWiFi.begin();
  Serial.begin(115200);
  LGPS.powerOn();
  while(!Serial) delay(1000); /* comment out this line when Serial is not present, ie. run this demo without connect to PC */

  Serial.println("Connecting to AP");
  while (0 == LWiFi.connect(WIFI_AP, LWiFiLoginInfo(WIFI_AUTH, WIFI_PASSWORD)))
  {
    delay(1000);
  }
  
  Serial.println("calling connection");

  while (!c2.connect(SITE_URL, 80))
  {
    Serial.println("Re-Connecting to WebSite");
    delay(1000);
  }
  delay(100);

  pinMode(13, OUTPUT);
  getconnectInfo();
  connectTCP();
}

void getconnectInfo(){
  //calling RESTful API to get TCP socket connection
  c2.print("GET /mcs/v2/devices/");
  c2.print(DEVICEID);
  c2.println("/connections.csv HTTP/1.1");
  c2.print("Host: ");
  c2.println(SITE_URL);
  c2.print("deviceKey: ");
  c2.println(DEVICEKEY);
  c2.println("Connection: close");
  c2.println();
  
  delay(500);

  int errorcount = 0;
  while (!c2.available())
  {
    Serial.println("waiting HTTP response: ");
    Serial.println(errorcount);
    errorcount += 1;
    if (errorcount > 10) {
      c2.stop();
      return;
    }
    delay(100);
  }
  int err = http.skipResponseHeaders();

  int bodyLen = http.contentLength();
  Serial.print("Content length is: ");
  Serial.println(bodyLen);
  Serial.println();
  char c;
  int ipcount = 0;
  int count = 0;
  int separater = 0;
  while (c2)
  {
    int v = c2.read();
    if (v != -1)
    {
      c = v;
      Serial.print(c);
      connection_info[ipcount]=c;
      if(c==',')
      separater=ipcount;
      ipcount++;    
    }
    else
    {
      Serial.println("no more content, disconnect");
      c2.stop();

    }
    
  }
  Serial.print("The connection info: ");
  Serial.println(connection_info);
  int i;
  for(i=0;i<separater;i++)
  {  ip[i]=connection_info[i];
  }
  int j=0;
  separater++;
  for(i=separater;i<21 && j<5;i++)
  {  port[j]=connection_info[i];
     j++;
  }
  Serial.println("The TCP Socket connection instructions:");
  Serial.print("IP: ");
  Serial.println(ip);
  Serial.print("Port: ");
  Serial.println(port);
  portnum = atoi (port);
  Serial.println(portnum);

} //getconnectInfo

void uploadstatus(){

  Serial.println("LGPS loop"); 
  LGPS.getData(&info);
  Serial.println((char*)info.GPGGA); 
  tmp = getComma(2, (char*)info.GPGGA);
  x = (char*)info.GPGGA;
  latitude = getDoubleNumber(&x[tmp]);
  tmp = getComma(4, x);
  longitude = getDoubleNumber(&x[tmp]);
  Serial.println(latitude/100.0,6);
  Serial.println(longitude);
  
  //calling RESTful API to upload datapoint to MCS to report LED status
  Serial.println("calling connection");
  LWiFiClient c2;  

  while (!c2.connect(SITE_URL, 80))
  {
    Serial.println("Re-Connecting to WebSite");
    delay(1000);
  }

  // The GPS location is based on the latitude, longitude, and meters above sea level
    
    //upload_led = 'GPS_Location,,' + longitude + ','  + latitude + ',806';

    upload_led = "GPS_Location,,";
    upload_led = upload_led + String(longitude/100.0,6);
    upload_led = upload_led + ",-";
    upload_led = upload_led + String(latitude/100.0,6);
    tmp = getComma(9, x);
    upload_led = upload_led + ",";
    upload_led = upload_led + getDoubleNumber(&x[tmp]);
    
  Serial.println(upload_led);
  
  int thislength = upload_led.length();
  
  HttpClient http(c2);
  c2.print("POST /mcs/v2/devices/");
  c2.print(DEVICEID);
  c2.println("/datapoints.csv HTTP/1.1");
  c2.print("Host: ");
  c2.println(SITE_URL);
  c2.print("deviceKey: ");
  c2.println(DEVICEKEY);
  c2.print("Content-Length: ");
  c2.println(thislength);
  c2.println("Content-Type: text/csv");
  c2.println("Connection: close");
  c2.println(); 
  c2.println(upload_led);

  
  
  delay(500);

  int errorcount = 0;
  while (!c2.available())
  {
    Serial.print("waiting HTTP response: ");
    Serial.println(errorcount);
    errorcount += 1;
    if (errorcount > 10) {
      c2.stop();
      return;
    }
    delay(100);
  }
  int err = http.skipResponseHeaders();

  int bodyLen = http.contentLength();
  Serial.print("Content length is: ");
  Serial.println(bodyLen);
  Serial.println();
  while (c2)
  {
    int v = c2.read();
    if (v != -1)
    {
      Serial.print(char(v));
    }
    else
    {
      Serial.println("no more content, disconnect");
      c2.stop();

    }
    
  }
}



void connectTCP(){
  //establish TCP connection with TCP Server with designate IP and Port
  c.stop();
  Serial.println("Connecting to TCP");
  Serial.println(ip);
  Serial.println(portnum);
  while (0 == c.connect(ip, portnum))
  {
    Serial.println("Re-Connecting to TCP");    
    delay(1000);
  }  
  Serial.println("send TCP connect");
  c.println(tcpdata);
  c.println();
  Serial.println("waiting TCP response:");
} //connectTCP

void heartBeat(){
  Serial.println("send TCP heartBeat");
  c.println(tcpdata);
  c.println();
    
} //heartBeat

void loop()
{
  //Check for TCP socket command from MCS Server 
  String tcpcmd="";
  while (c.available())
   {
      int v = c.read();
      if (v != -1)
      {
        Serial.print((char)v);
        tcpcmd += (char)v;

        // substring(40) looks at the 40th position in the string (which so happens to be when it starts with LED_Control)
        // If this is equal to LED_Control,1 then I should turn it on, if it's LED_Control,0 then turn it off
        if (tcpcmd.substring(40).equals(tcpcmd_led_on)){
          digitalWrite(13, HIGH);
          Serial.println("Switch LED ON ");
          tcpcmd="";
        }else if(tcpcmd.substring(40).equals(tcpcmd_led_off)){  
          digitalWrite(13, LOW);
          Serial.println("Switch LED OFF");
          tcpcmd="";
        }
      }
   }

  LDateTime.getRtc(&rtc);
  if ((rtc - lrtc) >= per) {
    heartBeat();
    lrtc = rtc;
  }
  //Check for report datapoint status interval
  LDateTime.getRtc(&rtc1);
  if ((rtc1 - lrtc1) >= per1) {
    uploadstatus();
    lrtc1 = rtc1;
  }
  
}

static double getDoubleNumber(const char *s)
{
  char buf[10];
  unsigned char i;
  double rev;
  
  i=getComma(1, s);
  i = i - 1;
  strncpy(buf, s, i);
  buf[i] = 0;
  rev=atof(buf);
  Serial.println(buf);
  return rev; 
}

static unsigned char getComma(unsigned char num,const char *str)
{
  unsigned char i,j = 0;
  int len=strlen(str);
  for(i = 0;i < len;i ++)
  {
     if(str[i] == ',')
      j++;
     if(j == num)
      return i + 1; 
  }
  return 0; 
}

LED Control Commented Code

Arduino
// including a bunch of libraries
#include <HttpClient.h>
#include <LTask.h>
#include <LWiFi.h>
#include <LWiFiClient.h>
#include <LDateTime.h>

// Set Connection settings
#define WIFI_AP "IT Portable Hotspot" // Put in your home wifi name
#define WIFI_PASSWORD "12345678"      // Put in your password
#define WIFI_AUTH LWIFI_WPA  // choose from LWIFI_OPEN, LWIFI_WPA, or LWIFI_WEP.
#define per 50                        // leave this setting
#define per1 3                        // leave this setting
#define DEVICEID "********"           // Input your deviceId from MediaTek
#define DEVICEKEY "***************"   // Input your deviceKey from MediaTek
#define SITE_URL "api.mediatek.com"   // leave this setting (because we are using MediaTek)

LWiFiClient c;          // This sets the wifi client variable for exchanging data
unsigned int rtc;       
unsigned int lrtc;
unsigned int rtc1;
unsigned int lrtc1;
char port[4]={0};
char connection_info[21]={0};
char ip[21]={0};             
int portnum;
int val = 0;
String tcpdata = String(DEVICEID) + "," + String(DEVICEKEY) + ",0";
String upload_led;    // This is what is modified and sent to the sandbox
String tcpcmd_led_on = "LED_Control,1";
String tcpcmd_led_off = "LED_Control,0";

LWiFiClient c2;       // This is the other wifi client variable
HttpClient http(c2);  // setup the HttpClient using c2

///////////////////// setup ///////////////////////
void setup()
{
  
  LTask.begin();
  LWiFi.begin();
  Serial.begin(115200);   // HTTP requires a much higher than 9600 baud rate
  while(!Serial) delay(1000); /* comment out this line when Serial is not present, ie. run this demo without connect to PC */

  Serial.println("Connecting to AP");   // Tell the user that the it is going to try connecting
  while (0 == LWiFi.connect(WIFI_AP, LWiFiLoginInfo(WIFI_AUTH, WIFI_PASSWORD)))
  {
    delay(1000);    // if it can't connect to the wifi then it'll just keep waiting until it connects
  }

  // After it is done waiting it'll tell the user that it's going to start connecting
  Serial.println("calling connection");

  while (!c2.connect(SITE_URL, 80))
  {
    Serial.println("Re-Connecting to WebSite");
    delay(1000);  // if it can't connect to the website then it'll just keep waiting until it does
  }
  delay(100);     // this delay is just to make sure that the arduino doesn't freak out

  pinMode(13, OUTPUT);  // pin 13 on the arduino is typically the onboard LED
  getconnectInfo();     // Go to the function getconnectInfo()
  connectTCP();         // Go to the function connectTCP()
}

void getconnectInfo(){
  //calling RESTful API to get TCP socket connection
  // This is pretty straight forward, it sends information to the HTTP setup 
  // and the println() at the end is the confirmation to say that we are done
  // transmitting
  c2.print("GET /mcs/v2/devices/");
  c2.print(DEVICEID);
  c2.println("/connections.csv HTTP/1.1");
  c2.print("Host: ");
  c2.println(SITE_URL);
  c2.print("deviceKey: ");
  c2.println(DEVICEKEY);
  c2.println("Connection: close");
  c2.println();

  // wait a little bit to hear back on how we did
  delay(500);

  // we print the number of errors up to 10 if we don't hear back positively
  int errorcount = 0;
  while (!c2.available())
  {
    Serial.println("waiting HTTP response: ");
    Serial.println(errorcount);
    errorcount += 1;
    if (errorcount > 10) {
      c2.stop();
      return;
    }
    delay(100);
  }
  int err = http.skipResponseHeaders();

  // bodyLen is used (as far as I understand it) a check on whether the information was transmitted correctly
  int bodyLen = http.contentLength();
  Serial.print("Content length is: ");
  Serial.println(bodyLen);
  Serial.println();
  char c;
  int ipcount = 0;
  int count = 0;
  int separater = 0;
  while (c2)
  {
    int v = c2.read();
    if (v != -1)
    {
      c = v;
      Serial.print(c);
      connection_info[ipcount]=c;
      if(c==',')
      separater=ipcount;
      ipcount++;    
    }
    else
    {
      Serial.println("no more content, disconnect");
      c2.stop();

    }
    
  }
  Serial.print("The connection info: ");
  Serial.println(connection_info);
  int i;
  for(i=0;i<separater;i++)
  {  ip[i]=connection_info[i];
  }
  int j=0;
  separater++;
  for(i=separater;i<21 && j<5;i++)
  {  port[j]=connection_info[i];
     j++;
  }
  Serial.println("The TCP Socket connection instructions:");
  Serial.print("IP: ");
  Serial.println(ip);
  Serial.print("Port: ");
  Serial.println(port);
  portnum = atoi (port);
  Serial.println(portnum);

} //getconnectInfo

void uploadstatus(){
  //calling RESTful API to upload datapoint to MCS to report LED status
  // This basically uploads the information that we want to transmit back to the MediaTek sandbox
  Serial.println("calling connection");
  LWiFiClient c2;  

  while (!c2.connect(SITE_URL, 80))
  {
    Serial.println("Re-Connecting to WebSite");
    delay(1000);    // I wait until I've connected
  }
  delay(100);
  if(digitalRead(13)==1)    // if the onboard pin (13) is high then transmit the string "LED_Display,,1"
  upload_led = "LED_Display,,1";    // the structure is "VariableFromMediaTek,,Value"
  else
  upload_led = "LED_Display,,0";
  int thislength = upload_led.length();   // I get the length of the upload_led
  HttpClient http(c2);                    
  c2.print("POST /mcs/v2/devices/");      // I start sending information to the website (which I verified worked above)
  c2.print(DEVICEID);                     // I send the deviceID to specify where to send the data
  c2.println("/datapoints.csv HTTP/1.1");
  c2.print("Host: ");
  c2.println(SITE_URL);                  
  c2.print("deviceKey: ");
  c2.println(DEVICEKEY);                  // The Devicekey is used from MediaTek to identify the specific device
  c2.print("Content-Length: ");
  c2.println(thislength);                 // thislength is used as a check (it would appear) to verify the data got sent correctly
  c2.println("Content-Type: text/csv");
  c2.println("Connection: close");
  c2.println();
  c2.println(upload_led);                 // this is the important information that needs to be send
  
  delay(500);

  // Now I verify that I didn't get any errors back
  int errorcount = 0;
  while (!c2.available())
  {
    Serial.print("waiting HTTP response: ");
    Serial.println(errorcount);
    errorcount += 1;
    if (errorcount > 10) {
      c2.stop();
      return;
    }
    delay(100);
  }
  int err = http.skipResponseHeaders();

  int bodyLen = http.contentLength();
  Serial.print("Content length is: ");
  Serial.println(bodyLen);
  Serial.println();
  while (c2)
  {
    int v = c2.read();
    if (v != -1)
    {
      Serial.print(char(v));
    }
    else
    {
      Serial.println("no more content, disconnect");
      c2.stop();

    }
    
  }
}



void connectTCP(){
  //establish TCP connection with TCP Server with designate IP and Port
  c.stop();
  Serial.println("Connecting to TCP");
  Serial.println(ip);
  Serial.println(portnum);
  while (0 == c.connect(ip, portnum))
  {
    Serial.println("Re-Connecting to TCP");    
    delay(1000);
  }  
  Serial.println("send TCP connect");
  c.println(tcpdata);
  c.println();
  Serial.println("waiting TCP response:");
} //connectTCP

void heartBeat(){
  Serial.println("send TCP heartBeat");
  c.println(tcpdata);
  c.println();
    
} //heartBeat

void loop()
{
  //Check for TCP socket command from MCS Server 
  String tcpcmd="";
  while (c.available())
   {
      int v = c.read();
      if (v != -1)
      {
        Serial.print((char)v);
        tcpcmd += (char)v;
        if (tcpcmd.substring(40).equals(tcpcmd_led_on)){
          digitalWrite(13, HIGH);
          Serial.print("Switch LED ON ");
          tcpcmd="";
        }else if(tcpcmd.substring(40).equals(tcpcmd_led_off)){  
          digitalWrite(13, LOW);
          Serial.print("Switch LED OFF");
          tcpcmd="";
        }
      }
   }

  LDateTime.getRtc(&rtc);
  if ((rtc - lrtc) >= per) {
    heartBeat();
    lrtc = rtc;
  }
  //Check for report datapoint status interval
  LDateTime.getRtc(&rtc1);
  if ((rtc1 - lrtc1) >= per1) {
    uploadstatus();
    lrtc1 = rtc1;
  }
  
}

Credits

Alex Merchen

Alex Merchen

11 projects • 18 followers
I'm an EE with a Masters in ECE. I like building things.

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