CODEWITHSUNDEEP
arduinowifiesp8266
Federico
Federico

Reputation: 153

Arduino: connect Arduino with ESP8266 aka ESP-01

I have an Arduino Mega 2560.

I want to connect it to ESP8266 aka ESP 01 module.

First i open and compile an empty sketch. When i start serial monitor, i write AT commands (like connect with WIFI) in serial monitor and i click on send button. In this case all works fine.

After I tested that the commands works properly , I want to write an Arduino sketch in which I implement the function to automatically send command without writing it in serial monitor.

For this purpose, i write this code:

#define SSID "test"
#define PASS "1111"

void connectWiFi() {
Serial.write(“AT+CWJAP=\"SSID\",\"PASS\""); 
}

void setup() {

Serial.begin(9600);

connectWiFi();

}

void loop() {
}

When i try to execute the code in Serial monitor, it is printed only the string but the command does not work.

Why when i write this command in serial monitor works and when i try the code above, the command does not work?

Is there a way to pass and execute a command from arduino sketch? What is the problem in my code if is wrong?

Thanks in advance for response.

Sorry for my English.

Upvotes: 0

Views: 1232

Answers (1)

Faisal Arafsha
Faisal Arafsha

Reputation: 36

Serial.write(...) makes arduino write through its serial ports (i.e. USB or pins 0 and 1). A better way to make Arduino send instructions directly to ESP is by defining "software serial" pins to communicate with ESP.

You'll need to include SoftwareSerial.h and use SoftwareSerial esp8266(2,3); for example to make pins 2 and 3 communicate serially with ESP.

Your code should look something like this:

#include <SoftwareSerial.h>

#define SSID "test"
#define PASS "1111"

SoftwareSerial esp8266(2,3);
void setup(){
  Serial.begin(9600);
  esp8266.begin(9600); //ensure this baudrate is similar to your ESP's
  delay(500); //give it some time

  esp8266.println(“AT+CWJAP=\"SSID\",\"PASS\""); //send to ESP this way
}

void loop(){
  if(esp8266.available()){
    while(esp8266.available()){
      Serial.write(esp8266.read()); //make serial monitor print what ESP sends
    }  
  }
}

You can also refer to this example for further detail

Upvotes: 2

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