Trouble connecting to internet with ESP01 and Arduino

Official Hardware Retired GSM Shield
1

Hello.

I am trying to establish a connection to Internet using an ESP8266 and an Arduino Uno.

I am using the following connections for the circuit:

pic1
pic12962×1136 300 KB

An the following code:

// Programa: Versao firmware modulo ESP8266 e
//           mudanca de baud rate
// Autor : FILIPEFLOP
 
#include <SoftwareSerial.h>
 
//RX pino 2, TX pino 3
SoftwareSerial esp8266(2, 3);
 
#define DEBUG true
 
void setup()
{
  Serial.begin(9600);
  // Configure na linha abaixo a velocidade inicial do
  // modulo ESP8266
  esp8266.begin(115200);
  sendData("AT+RST\r\n", 2000, DEBUG);
  delay(1000);
  Serial.println("Versao de firmware");
  delay(3000);
  sendData("AT+GMR\r\n", 2000, DEBUG); // rst
  // Configure na linha abaixo a velocidade desejada para a
  // comunicacao do modulo ESP8266 (9600, 19200, 38400, etc)
  sendData("AT+CIOBAUD=19200\r\n", 2000, DEBUG);
  Serial.println("** Final **");
}
 
void loop() {}
 
String sendData(String command, const int timeout, boolean debug)
{
  // Envio dos comandos AT para o modulo
  String response = "";
  esp8266.print(command);
  long int time = millis();
  while ( (time + timeout) > millis())
  {
    while (esp8266.available())
    {
      // The esp has data so display its output to the serial window
      char c = esp8266.read(); // read the next character.
      response += c;
    }
  }
  if (debug)
  {
    Serial.print(response);
  }
  return response;
}

However, when running the code all I get in the Monitor Serial is:

⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮w⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮w⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮Versao de firmware
⸮⸮⸮⸮⸮wo⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮o⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮w⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮** Final **

Does anybody have any idea on what may be going wrong?

Thanks in advance

2

I have to ask, why the Uno and ESP8266-01 and not just use a NodeMCU (or equivalent) by itself and do away with the hassle of the Uno and the AT commands?

3

Thanks for the input.

To be honest, the main reason is that I'm kinda new to this and received the project from someone else that had already started it. So I just got the available components and am trying work something out with them.

But also, there are other boards in the project. One board used to access an SD card and one board to allow ethernet connections. So I guess the Arduino was chosen because it would make it easier to interface with multiple components.

Do you think in this case it would still be a good idea to change the ESP8266 for a NodeMCU?

4

Do you really need both Ethernet and WiFi?

Is the Ethernet card a shield that fits the Uno?

The Ethernet and the SD card both use the SPI interface. That means that they would share MOSI, MISO and SCK and have a chip select each, so 5 pins. The NodeMCU (or equivalent) could handle that easily. It really would be easier to program and be more reliable (in my opinion) if you just use a NodeMCU by itself and connect it to SD card module and an Ethernet module.

5

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