IOT | Post Data to Thingspeak Using ESP8266: 3 Steps

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.

Step 1: Required Component

ESP8266 on Amazon USA - https://amzn.to/2SS3XXO

ESP8266 on Amazon UK - https://amzn.to/2AGW3t7

ESP8266 on Amazon India - https://amzn.to/2AGW3t7

MLX90614 on Amazon USA - https://amzn.to/2AGW3t7

MLX90614 on Amazon UK - https://amzn.to/2AGW3t7

MLX90614 on Amazon India - https://amzn.to/2AGW3t7

Breadboard on Amazon USA - https://amzn.to/2AGW3t7

Breadboard on Amazon UK - https://amzn.to/2AGW3t7

Breadboard on Amazon India - https://amzn.to/2AGW3t7

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);
}