WIZnet / My_Weatherforecast_WIZwiki-W7500

Using TCP Client on WIZwiki-W7500, display weather conditions on led and temperature with servo-motor

Dependencies:   WIZnetInterface mbed-src

Prerequisite

This example is for PIR test using digital I/O.

To implement this function, you need a Platform board, network Interface board.

  • WIZwiki-W7500 from WIZnet (Platform board and Ethernet I/F board)

Hardware Configuration

WIZwiki-W7500 Pin map

pin map

Just connect Ethernet Cable & USB Cable

Software

Init Ethernet

void initEthernet(uint8_t* mac_addr) {
    int phy_link;

    eth.init(mac_addr); //Use DHCP
    
    eth.connect();
        
    /* phy link */
    do{
       phy_link = eth.ethernet_link();
       printf(".");
       wait(2);
    }while(!phy_link);
    printf("\r\n");
         
    printf("IP Address is %s\r\n", eth.getIPAddress());
}

Request to server using HTTP

void requestHTTP(void)
{
    char req_buf[256];
    
    /* TCP socket connect */   
    sock.connect(WEB_SERVER, 80);
    
    /* Request to WEB Server using HTTP */
    sprintf(req_buf,"GET /data/2.5/weather?q=%s,%s&appid=%s HTTP/1.1\nHost: %s\nConnection: close\n\n",
        CITY,COUNTRY, API_KEY, WEB_SERVER);
    sock.send_all(req_buf, strlen(req_buf));
}

Get data from server & Parsing it

void parsingGetData(void)
{
    char buffer[1024];
        
    /* get info */
    int ret;
    while (true) {
        ret = sock.receive_all(buffer, sizeof(buffer)-1);
        if (ret <= 0) break;
        buffer[ret] = '\0';
        pc.printf("Received %d chars from server: %s\n", ret, buffer);     
    }
    
    /* parsing weather, city, tempurature */
    char *weather;
    char *city;
    char *temp;
    uint8_t i;
    
    pc.printf("\r\n\r\n======== WeatherForecast ========\r\n");  
    weather = strstr(buffer, "main");
    pc.printf("\t State : ");
    for(i = 7; i < 20; i++)
    {
        if(*(weather+i) == '\"') break;
        pc.printf("%c", *(weather+i));
    }
            
    city = strstr(buffer, "name");
    pc.printf("\r\n\t City : ");
    for(i = 7; i < 20; i++)
    {
        if(*(city+i) == '\"') break;
        pc.printf("%c", *(city+i));
    }
        
    temp = strstr(buffer, "temp");
    pc.printf("\r\n\t temp(kelvin) : ");
    for(i = 6; i < 12; i++)
    {
        if((*(temp+i) == '\"')||(*(temp+i) == ',')) break;
        pc.printf("%c", *(temp+i));
    }
    pc.printf("\r\n\r\n");
}

Caution

Must fix API_KEY & MAC Address

main.cpp

Committer:
joon874
Date:
2015-06-25
Revision:
15:d3b1e25d3e23
Parent:
11:59dcefdda506

File content as of revision 15:d3b1e25d3e23:

#include "mbed.h"
#include "EthernetInterface.h"
#include "Servo.h"

DigitalOut bled(D6);
DigitalOut gled(D5);
DigitalOut rled(D4);

Servo myservo(D15);

int main() {
   
    int phy_link;
    printf("Wait a second...\r\n");
    uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x00, 0x01, 0x02}; 
    
    EthernetInterface eth;
    eth.init(mac_addr); //Use DHCP
    
    while(1){
    
    eth.connect();
    
    /* phy link */
     do{
        phy_link = eth.ethernet_link();
        printf("...");
        wait(2);
     }while(!phy_link);
     printf("\r\n");
     
    printf("IP Address is %s\r\n", eth.getIPAddress());
    
    /* TCP socket connect */
    TCPSocketConnection sock;
    sock.connect("api.openweathermap.org", 80);
    
    /* weather */
    char http_cmd[] = "GET /data/2.5/weather?q=Seoul,kr HTTP/1.0\n\n";
    //char http_cmd[] = "GET /data/2.5/weather?q=London,uk HTTP/1.0\n\n";
    //char http_cmd[] = "GET /data/2.5/weather?q=Berlin,de HTTP/1.0\n\n";
    sock.send_all(http_cmd, sizeof(http_cmd)-1);
    
    /* get info */
    char buffer[500];
    int ret;
    while (true) {
        ret = sock.receive(buffer, sizeof(buffer)-1);
        if (ret <= 0)
            break;
        buffer[ret] = '\0';
        printf("Received %d chars from server: %s\n", ret, buffer);     
    }

    /* get weather, city, tempurature */
    char *weather;
    char *city;
    char *tempure;
    
    char weather_stu[3];
    char city_name[6];
    char tempure_data[6];
    
   weather = strstr(buffer, "main");
        printf("%.4s\n", weather + 7);
        for(int i=0; i<3;i++){
            weather_stu[i] = weather[i+7];
       }
   
   city = strstr(buffer, "name");
        printf("%.6s\n", city + 7);
        for(int k=0; k<6;k++){
            city_name[k] = city[k+7];
            printf("%c",city_name[k]);
        }
 
   tempure = strstr(buffer, "temp");
        printf("%.3s\n", tempure + 6);
        for(int j=0; j<6;j++){
            tempure_data[j] = tempure[j+6];
            printf("%c",tempure_data[j]);
        }
        
        /*tempurature display */ 
        float data[2]={0};
        data[0] = tempure_data[1]-'7';
        data[1] = tempure_data[2]-'3';
        
        myservo = (data[0]*10+data[1])/40;

        printf("%f",(data[0]*10+data[1])/40);
   
   /* weather display */
   if(strcmp(weather_stu,"Clo")==0) {
        rled = 1; 
        gled = 1; 
        bled = 1;
    }else if(strcmp(weather_stu,"Rai")==0) {
        rled = 0; 
        gled = 0;
        bled = 1; 
    }else if(strcmp(weather_stu,"Cle")==0){
        rled = 1; 
        gled = 1;
        bled = 0; 
    }else {
        rled = 0;
        bled = 0;
        gled = 0;
        }

    sock.close();
    
    eth.disconnect();
    
    wait(60.0);
   };

}