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Arduino ESP Code
#include <Wire.h>
#include <ESP8266WiFi.h>

String apiKey = "<API_KEY>";     //  Enter your Write API key from ThingSpeak

const char *ssid =  "ssid";     // replace with your wifi ssid and wpa2 key
const char *pass =  "pass";
const char* server = "api.thingspeak.com";
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>


#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme; // I2C
WiFiClient client;

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");
  
  unsigned status;
  status = bme.begin();
  if (!status) {
    Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
    Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(), 16);
    Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
    Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
    Serial.print("        ID of 0x60 represents a BME 280.\n");
    Serial.print("        ID of 0x61 represents a BME 680.\n");
    while (1);
  }
  send_data();
  ESP.deepSleep(600e6); 
}

void send_data()
{

  float h = bme.readHumidity();
  float t = bme.readTemperature();
  float p = bme.readPressure() / 100.0;

  if (isnan(h) || isnan(t) || isnan(p))
  {
    Serial.println("Failed to read from BME280 sensor!");
    return;
  }

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

    String postStr = apiKey;
    postStr += "&field1=";
    postStr += String(t);
    postStr += "&field2=";
    postStr += String(h);
    postStr += "&field3=";
    postStr += String(p);
    postStr += "\r\n\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("Temperature: ");
    Serial.print(t);
    Serial.print(" degrees Celcius, Humidity: ");
    Serial.print(h);
    Serial.print(" %. Pressure: ");
    Serial.print(p);
    Serial.println("mBar. Send to Thingspeak.");
  }
  client.stop();

  Serial.println("Deepsleep...");
  Serial.println(millis());
}
void loop(){

}