File content as of revision 0:8ca71ccb52db:

#include "mbed.h"
#include "ESP8266.h"
 
Serial pc(USBTX,USBRX);
AnalogIn pot(PTB0); // pir senor input
ESP8266 wifi(PTE0, PTE1, 115200); // baud rate for wifi
char snd[255],rcv[1000];
char http_cmd[300];
 
//#define IP "data.sparkfun.com" 
//#define IP "184.106.153.149"
#define IP "192.168.0.39"
 
float val = 0; //global variable

char* Public_Key = "Xb3ovW3grvIMo31jd8p0HmPEba3O";
char* Private_Key = "LPZe7qZLg7t0NnWbYD2XHrmB2AMq";

/************ WiFi INTIALIZATION *********/
 
void wifi_initialize(void);
void wifi_send(void);
 
int main () {
    

 wifi_initialize();
 
    while (1) {
       
    val = pot.read();
    pc.printf("\r\nPotentiometer value=%.3f \r\n", val);
    pc.printf("Sending WiFi information\n\r");
    wifi_send();
    wait(4);
    }
}
    
void wifi_initialize(){
    
    pc.baud(9600);   
    pc.printf("SET mode to AP\r\n");
    wifi.SetMode(1);    // set ESP mode to 1
    wifi.RcvReply(rcv, 1000);    //receive a response from ESP
    pc.printf("%s",rcv);    //Print the response onscreen
    pc.printf("Conneting to AP\r\n");
    wifi.Join("Eduvance_WiFi", "eduvance");     // Your wifi username & Password 
    wifi.RcvReply(rcv, 1000);    //receive a response from ESP
    pc.printf("%s", rcv);    //Print the response onscreen
    wait(8);     //waits for response from ESP
    pc.printf("Getting IP\r\n");    //get IP addresss from the connected AP
    wifi.GetIP(rcv);    //receive an IP address from the AP
    pc.printf("%s", rcv);
    wait(5); // Delay 5 sec to give the pir time to get snapshut of the surrounding
    pc.printf("Initializing WiFi\r\n"); 
}

void wifi_send(void){

    strcpy(snd,"AT+CIPMODE=0");//Setting WiFi into MultiChannel mode
    wifi.SendCMD(snd);
    //pc.printf(snd);
    wifi.RcvReply(rcv, 3000);
    pc.printf("%s", rcv);
    
    //WIFI updates the Status to Thingspeak servers//
    strcpy(snd,"AT+CIPMUX=1");//Setting WiFi into MultiChannel mode
    wifi.SendCMD(snd);
    //pc.printf(snd);
    wifi.RcvReply(rcv, 3000);
    pc.printf("%s", rcv);
    
    sprintf(snd,"AT+CIPSTART=4,\"TCP\",\"%s\",8080",IP); //Initiate connection with server
    wifi.SendCMD(snd);
    //pc.printf(snd);
    wifi.RcvReply(rcv, 3000);
    pc.printf("%s", rcv);
    
    sprintf(http_cmd,"GET /input/%s?private_key=%s&val=%0.2f HTTP/1.0\n\n",Public_Key,Private_Key,val); //Post values 
    pc.printf("%d",strlen(http_cmd));
    strcpy(snd,"AT+CIPSEND=4,105");    //Send Number of open connections,Characters to send 
    wifi.SendCMD(snd);
    //pc.printf(snd);
    wifi.RcvReply(rcv, 3000);
    pc.printf("%s", rcv);
    
    sprintf(snd,"GET /input/%s?private_key=%s&val=%0.2f HTTP/1.0\n\n",Public_Key,Private_Key,val); //Post values 
    strcpy(snd, http_cmd);
    pc.printf("%s",http_cmd);
    wifi.SendCMD(http_cmd);
    wifi.RcvReply(rcv, 3000);
    pc.printf("%s", rcv);
    
    //wifi.SendCMD("AT+CIPCLOSE"); //Close the connection to server
    //wifi.RcvReply(rcv, 3000);
    //pc.printf("%s", rcv);
}