IOT | Post Data to Thingspeak Using ESP8266

Nowadays, IoT is trending and lots of machine has data to upload over cloud and analyse the data. Small sensors update the data on cloud and actuator on another end acts on it.
I am going to explain the one of the example of IoT.

I this article and i am going to show and guide to post the data to Thingspeak using ESP8266.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Required Component

ESP8266
ESP8266 in India- https://amzn.to/2peaoen

ESP8266 in UK - https://amzn.to/2peaoen

ESP8266 in USA - https://amzn.to/2peaoen

MLX90614
MLX90614 in India- https://amzn.to/2C4E5Br

MLX90614 in UK - https://amzn.to/2C4E5Br

MLX90614 in USA - https://amzn.to/2C4E5Br

BreadBoard

BreadBoard in India- https://amzn.to/2MW0Opb

BreadBoard in USA- https://amzn.to/2MW0Opb BreadBoard in UK- https://amzn.to/2MW0Opb

Step 2: Code

#include 
#include 
#include 
String apiKey = "7CDCTE2767Z8AUIL";     //  Enter your Write API key from ThingSpeak
const char *ssid =  "hidden";     // replace with your wifi ssid and wpa2 key
const char *pass =  "qwerty12";
const char* server = "api.thingspeak.com";
WiFiClient client;
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
int objTemp;
int ambTemp;
void setup() 
{
       Serial.begin(115200);
       delay(10);
 
       Serial.println("Connecting to ");
       Serial.println(ssid);
 
 
       WiFi.begin(ssid, pass);
 
      while (WiFi.status() != WL_CONNECTED) 
     {
            delay(500);
            Serial.print(".");
     }
      Serial.println("");
      Serial.println("WiFi connected");
     mlx.begin();  
     Wire.begin(D1,D2);
 
}
 
void loop() 
{
  if (client.connect(server,80))   //   "184.106.153.149" or api.thingspeak.com
  {  
        objTemp = mlx.readObjectTempC();
        ambTemp = mlx.readObjectTempC();
         String postStr = apiKey;
         postStr +="&field1=";
         postStr += String(objTemp);
         postStr += "\r\n\r\n";
         client.print("POST /update HTTP/1.1\n");
         client.print("Host: api.thingspeak.com\n");
         client.print("Connection: close\n");
         client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
         client.print("Content-Type: application/x-www-form-urlencoded\n");
         client.print("Content-Length: ");
         client.print(postStr.length());
         client.print("\n\n");
         client.print(postStr);
         Serial.print("Ambient = "); Serial.print(ambTemp); 
        Serial.print("*C\tObject = "); Serial.print(objTemp); Serial.println("*C");
    }
    client.stop();
  
  delay(2000);
}