![](/media/cache/group/WIZnet_logo_001.jpg.50x50_q85.jpg)
Geolocation and NTP Example for WizFi250 on WIZwiki-W7500
Dependencies: Adafruit_GFX HTTPClient NTPClient WizFi250Interface mbed
System Diagram
I want to make a watch, that can check my location and time. So I decide to make this watch using Wi-Fi module(WizFi250) and Cortex-M0 MCU(WIZwiki-W7500). For getting geolocation of this watch, I used ip-api.com which geolocation server and I used NTP server for getting current time. This picture is system diagram of my project.
Materials
WIZwiki-W7500 ( MCU )
WizFi250-EVB ( Wi-Fi Module )
Sensor Shield
SSD1306 OLED
Refer to this URL.
https://developer.mbed.org/components/Adafruit-OLED-128x32/
Hardware Configuration
UART0 RX/TX/CTS/RTS pins of WIZwiki-W7500 board are used to control WizFi250 which Wi-Fi module and It use I2C SDA/SCL pins for using SSD1306 OLED.
Demo Video
For more detailed information, refer to this URL.
main.cpp
- Committer:
- kaizen
- Date:
- 2015-08-26
- Revision:
- 3:1f2938317c31
- Parent:
- 2:3a84959399d3
- Child:
- 4:6d1627cfb314
File content as of revision 3:1f2938317c31:
#include "mbed.h" #include "Adafruit_SSD1306.h" #include "WizFi250Interface.h" #include "NTPClient.h" #include "HTTPClient.h" #define SECURE WizFi250::SEC_AUTO #define SSID "wizms1" #define PASS "maker0701" #if defined(TARGET_WIZwiki_W7500) // #define SDA PA_10 // #define SCL PA_9 WizFi250Interface wizfi250(D1,D0,D7,D8,PA_12,NC,115200); Serial pc(USBTX,USBRX); #endif // an SPI sub-class that provides a constructed default //class I2CPreInit : public I2C //{ //public: // I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl) // { // frequency(100000); // start(); // }; //}; //I2CPreInit gI2C(SDA,SCL); //Adafruit_SSD1306_I2c gOled(gI2C,NC,0x78,64,128); NTPClient ntpClient; HTTPClient httpClient; void parse(char buffer[], int *j, char *string); //FUNCTION TO PARSE HTTP GET DATA char httpGetData[1024]; //BUFFER TO HOLD DATA FROM HTTP GET REQUEST int main() { time_t ctTime; //system time structure char success[10]={0}; //success first char countryFull[20]={0}; //Full Country Name char countryAbrv[5]={0}; //Abbreviated Country Name or country Code char stateAbrv[5]={0}; //Abbreviated State or region code char stateFull[15]={0}; //Full State Name char city[15]={0}; //City Name char zip[6]={0}; //ZIP CODE char latitude[10]={0}; //latitude char longitude[10]={0}; //longitude char timeZone[30]={0}; //timeZone int j=0, returnCode; pc.baud(115200); // gOled.begin(); // gOled.clearDisplay(); wizfi250.init(); returnCode = wizfi250.connect(SECURE, SSID, PASS); if ( returnCode == 0 ) { printf(" - WiFi Ready\r\n"); printf("IP Address is %s\r\n", wizfi250.getIPAddress()); } else { printf(" - Could not initialize WiFi - ending\r\n"); return 0; } //HANDLES THE HTTP GET REQUEST THE WAY THE FUNCTION IS CALLED HERE IS THE FOLLOWING // get(DOMAIN_NAME,BUFFER,TIMEOUT_VAL) //DOMAIN_NAME= domain name that get request is sent to //BUFFER= buffer to store data returned from the server //TIMEOUT_VAL= Time before the request times out HTTPResult r = httpClient.get("http://ip-api.com/csv",httpGetData,128); //GET GEOLOCATION DATA (CSV) if (r==HTTP_OK) { //IF THE DATA WAS RECIEVED j=0; //parse and display each of the API's location information strings on the LCD parse(httpGetData, &j, success); parse(httpGetData,&j,countryFull); parse(httpGetData,&j,countryAbrv); parse(httpGetData,&j,stateAbrv); parse(httpGetData,&j,stateFull); parse(httpGetData,&j,city); parse(httpGetData,&j,zip); parse(httpGetData,&j,latitude); parse(httpGetData,&j,longitude); parse(httpGetData,&j,timeZone); //gOled.printf("HTTP Data Received\r\n"); //gOled.display(); printf("HTTP Data Received\r\n"); } else { //HTTP GET REQUEST ERRORED // gOled.printf("HTTP Error %d\r\n", r); // gOled.display(); printf("HTTP Error %d\r\n", r); return -1; } printf("Reading Time...\r\n"); char* domainName="kr.pool.ntp.org"; //SET TO DOMAIN NAME OF SERVER GETTING TIME FROM //GETS THE TIME FROM THE SERVER //setTime(DOMAIN_NAME,PORT_NUMBER,TIME_OUT) //DOMAIN_NAME= domain name //PORT NUMBER=port number (123 for NTP) //TIME_OUT= timeout value for request ntpClient.setTime(domainName,123,0x00005000); printf("Time Set\r\n"); //Delay for human time to read LCD display wait(3.0); char buffer[80]; //BUFFER TO HOLD FORMATTED TIME DATA // gOled.printf("%s, %s %s, %s\r\n",city,stateAbrv,zip,countryAbrv); //PRINT CITY STATE AND ZIP INFORMATION AND COUNTRY // gOled.printf("LAT:%s\r\nLONG:%s\r\n",latitude,longitude); //PRINT LATITUDE AND LONGITUDE // gOled.printf("Timezone:%s\r\n",timeZone); //PRINT TIMEZONE printf("%s, %s %s, %s\r\n",city,stateAbrv,zip,countryAbrv); //PRINT CITY STATE AND ZIP INFORMATION AND COUNTRY printf("LAT:%s\r\nLONG:%s\r\n",latitude,longitude); //PRINT LATITUDE AND LONGITUDE printf("Timezone:%s\r\n",timeZone); //PRINT TIMEZONE wizfi250.disconnect(); //DISCONNECT FROM THE NETWORK while (1) { //ctTime = time(NULL)-(3600*4); //TIME with offset for eastern time US ctTime = time(NULL)+(3600*9); //TIME with offset for eastern time KR //FORMAT TIME FOR DISPLAY AND STORE FORMATTED RESULT IN BUFFER strftime(buffer,80,"%a %b %d\r\n%T %p %z\r\n %Z\r\n",localtime(&ctTime)); // gOled.printf("Univ Time Clock\r\n%s\r\n", buffer); // gOled.display(); // gOled.setTextCursor(0,40); printf("Univ Time Clock\r\n%s\r\n", buffer); wait(1); } } //SET FOR CSV FORMAT: NEEDS TO BE EDITED IF DIFFERENT FORMAT void parse(char buffer[], int *j, char *string) { //extracts next location string data item from buffer int i=0; for (i=0; i<=strlen(buffer); i++) { //TOTAL SIZE OF RETURNED DATA if ((buffer[*j+i] == ',')||(buffer[*j+i] == '\0' )) { //IF comma or end of string //comma is the string field delimiter string[i]=0; //SETS END OF SRTRING TO 0 *j=*j+i+1; //UPDATES to 1 after comma seperated value break; } else string[i]=buffer[*j+i]; //Keep adding to the string } }