This code uploads an analog value to the Things speak IOT server with the ESP8266 wifi module. Make sure to change the key to the data stream.

Dependencies:   ESP8266 mbed

Revision:
0:a42b121ce25a
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 23 09:30:56 2016 +0000
@@ -0,0 +1,85 @@
+#include "mbed.h"
+#include "ESP8266.h"
+
+Serial pc(USBTX,USBRX);
+AnalogIn inputPin(A2); // temp
+ESP8266 wifi(PTE0, PTE1, 115200); // baud rate for wifi
+char snd[255],rcv[1000];
+ 
+#define IP "184.106.153.149" // thingspeak.com IP Address
+ 
+float val; // value to holed the high/low info from pir from pin D2
+int cnt = 0; // counter for motion
+
+ 
+/************ WiFi INTIALIZATION *********/
+ 
+void wifi_send(void);
+ 
+int main () {
+    
+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");
+while (1) {
+       
+   val = inputPin.read();
+   pc.printf(" The Sensor is ON And I Detected = %i Till NOW\r\n",cnt);
+    pc.printf("Sending WiFi information\n\r");
+    wifi_send();
+    cnt++;
+          }
+    }
+ 
+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\",80",IP); //Initiate connection with THINGSPEAK server 
+  wifi.SendCMD(snd);
+  pc.printf(snd);
+  wifi.RcvReply(rcv, 3000);
+  pc.printf("%s", rcv);
+ 
+  strcpy(snd,"AT+CIPSEND=4,46");    //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 /update?key=4CDAJHYQ6JDNJC5G&field1=%2.2f\r\n",val); //Post values to thingspeak
+  pc.printf("String length %3d\r\n",strlen(snd));
+  pc.printf("%s",snd);
+  wifi.SendCMD(snd);
+  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);
+}
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