/*Modified by

Technical Team,REES52*/

#include <ESP8266WiFi.h>

#include <Wire.h>

#include "SSD1306.h"

SSD1306  display(0x3c, D1, D2);

// replace with your channel's thingspeak API key,

String apiKey = "WNOTJC3OBMYAYNB3";

const char* ssid = "**************";  // Enter Wi-fi ID

const char* password = "***************";   // Enter Wi-fi password

const char* server = "api.thingspeak.com";

WiFiClient client;

void setup() {    

  Serial.begin(115200);

  pinMode(A0,INPUT);

  display.init();

  display.flipScreenVertically();

  display.setFont(ArialMT_Plain_10);

  delay(10);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.println("WiFi connected");

}

void loop() {

  display.clear();

  int temp = analogRead(A0);

  if (client.connect(server,80)) {  //   "184.106.153.149" or api.thingspeak.com

    String postStr = apiKey;

           postStr +="&field1=";

           postStr += String(temp);

           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("Moisture Sensor Value: ");

     Serial.print(temp);

     display.drawString(0, 20,"Moisture: ");

     display.drawString(0, 30,String(temp));

     Serial.println(" send to Thingspeak");

     display.drawString(0, 10, "Send to Thingspeak");  

     display.display();

  }

  client.stop();

   Serial.println("Waiting...");    

  // thingspeak needs minimum 15 sec delay between updates

  // Here I set upload every 60 seconds

  for(unsigned int i = 0; i < 20; i++)

  {

    delay(2000);                        

  }                      

}