Arduino mega + ESP8266 board

[supekshala]

I am using Arduino Mega 2560 R3 built-in ESP8266 dev board for a project. my project basically reading few analog data and sends to the power bi dashboard using streaming dataset API. I have no idea yet how to program this particular board for this purpose. Previously I did this with node MCU board and it's worked. Here's the code I wrote for Node MCU.

#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClientSecureBearSSL.h>

#define SERVER_IP "https://api.powerbi.com/beta/d1323671-cdbe-4417-b4d4-bdb24b51316b/datasets/ce600abb-0afd-47e1-bdaf-6491f91945bd/rows?noSignUpCheck=1&key=stAvYHSNB6lDf%2BEEXS%2BU%2BsA2Kbyd3%2Bx9NKnWyZj5Uz5YPp%2Bbu7zdPUxboto4aXhls8rObnfYQXFPoIeo9ALrAA%3D%3D"

#define WI_SSID "SLT_FIBRE"
#define WI_PW  "dehff"

void sendData(int temp){
  std::unique_ptr<BearSSL::WiFiClientSecure>client(new BearSSL::WiFiClientSecure);
  client->setInsecure();
  HTTPClient https;

  Serial.print("[HTTP] begin...\n");
  // configure traged server and url
  https.begin(*client, SERVER_IP); //HTTPS
  https.addHeader("Content-Type", "application/json");

  Serial.print("[HTTP] POST...\n");
  // start connection and send HTTP header and body
  int httpCode = https.POST("[{\"Value\": " + String(temp) + "}]");

  // httpCode will be negative on error
  if (httpCode > 0) {
    // HTTP header has been send and Server response header has been handled
    Serial.printf("[HTTP] POST... code: %d\n", httpCode);

    if (httpCode == HTTP_CODE_OK) {
      const String& payload = https.getString();
      Serial.println("received payload:\n<<");
      Serial.println(payload);
      Serial.println(">>");
    }
  } else {
    Serial.printf("[HTTP] POST... failed, error: %s\n", https.errorToString(httpCode).c_str());
  }

  https.end();

}

void setup() {
  Serial.begin(115200);

  Serial.println();
  Serial.println();
  Serial.println();

  WiFi.begin(WI_SSID, WI_PW);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected! IP address: ");
  Serial.println(WiFi.localIP());

}

void loop() {
  // wait for WiFi connection
  int temp = analogRead(A0);
  Serial.println(temp);
  if ((WiFi.status() == WL_CONNECTED)) {
    sendData(temp);
  }

}```

[gabrielcsapo]

Hey @supekshala !

Can you give info about the board (eg. version, etc) and what errors you are receiving as a result of it?

[supekshala]

Iam using Mega 2560 R3 built-in ESP8266 board. I try to follow this https://www.gabrielcsapo.com/arduino-web-server-mega-2560-r3-built-in-esp8266/? but I am using a windows computer.

[gabrielcsapo]

Were you able to flash the firmware as instructed?

Are you having issues with something particular about the post or asking to do something specific that the post doesn't cover?

[supekshala]

No I think I messed up with that. First problem I have is to how to write a sketch to connect to internet using WiFi, read analog pins and POST data. In the first glance this is what came to my stupid mind “IF it is WiFi, upload a sketch to ESP, so I uploaded a sketch to ESP by setting the DIP switches 5,6,7 NO only” it could establish connection and POST data , but it couldn’t communicate with the analog pins of Arduino as expected. Yes, I’m wrong.
what Iam trying to do is, Read analog pins of Arduino mega >>>> send those data to the API.

[gabrielcsapo]

@supekshala it is important that when running the verify command you get the version output correctly. I can update the article to include a part about reading analog pins to show how to communicate that information into the server code.

[supekshala]

That would be a huge help. If you could please update the article about reading analog values from the mega+esp8266 board and sending those data into the Power BI streaming dataset. that would be great. THANK YOU VERY MUCH!!

[supekshala]

I successfully installed the AT firmware and It's responding to AT commands.

[supekshala]

Any update : )

[gabrielcsapo]

@supekshala I have posted a new section in https://www.gabrielcsapo.com/arduino-web-server-mega-2560-r3-built-in-esp8266/ that contains the interfacing with a sensor and showing that sensor data in the web server response.