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Using serial communication without pc

Former Member

I just started using the arduino and tried to build a remote control car. I have used the 434MHz RF module for radio transmission. I made a program for both remote and the receiver in the car, it worked fine when I tested it using my pc to send and receive signals. since I used the serial communication, it didn't work when I disconnected the arduinos from my pc. Is there a way to use the serial communication even when it is not connected to the pc, if it can be done, please suggest a way to do so.

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  • 0

    Hi,
    I have same problem.
    what  I am doing.wifi module connect with arduino and use Software serial communication,
    when I plug arduino to pc and open serial monitor then my programe is execute.
    but I dont want this."I want to directly start my program when i applied the power to the arduino".

    so plz suggest me
    thanks

  • 0 in reply to Former Member

    The program should always start the moment you connect power, once uploaded

     

    When you plug in a PC is will reset the program and start it again and if your monitoring the hardware serial it will reflect that

     

    If your using software serial for the WIFI then this should not be impacted, so my only conclusion is you may have something in your code testing to see if the hardware serial is connected and if not it waits

     

    Please provide your code so we can check it

  • 0 in reply to Robert Peter Oakes

    #include <SoftwareSerial.h>

    String str;

    int c=1;

    SoftwareSerial mySerial(10, 11); // RX, TX

    void setup() {

      setpins();

     

    pinMode(13,OUTPUT);

      // set the data rate for the SoftwareSerial port

      mySerial.begin(4800);

     

      wificonnect();

      gotIP();

      delay(3000);

     

     

    }

    void setpins()

    {

      pinMode(1,OUTPUT);

      pinMode(2,OUTPUT);

      pinMode(3,OUTPUT);

      pinMode(4,OUTPUT);

      pinMode(5,OUTPUT);

      pinMode(6,OUTPUT);

      pinMode(7,OUTPUT);

      pinMode(8,OUTPUT);

      pinMode(9,OUTPUT);

    }

    void gotIP()

    {

    if(mySerial.find("GOT IP"))

    {

     

    }else{

      gotIP();

      }

    }

    void wificonnect()

    {

    if(mySerial.find("CONNECTED"))

    {

     

    }

    else{

     

       mySerial.println("AT+CWJAP=\"ganesh\",\"123456789gg\"");

    delay(2000);

    wificonnect();

    }

     

     

    }

     

     

    void loop() { // run over and over

     

     

      delay(1000);

      if(c==1)

      {

       

        mySerial.println("AT+CIPMUX=1");

      }

      if(c==2)

      {

       mySerial.println("AT+CIPSTART=0,\"TCP\",\"GANESH.XP3.BIZ\",80");

      delay(2000);

      }

      if(c==3)

      {

         mySerial.println("AT+CIPSEND=0,50");

    delay(2000);

        mySerial.println("POST /index.php HTTP/1.0");

        mySerial.println("HOST: GANESH.XP3.BIZ");

        mySerial.println();mySerial.println();mySerial.println();mySerial.println();

     

     

      }

     

     

     

    if(mySerial.available())

    {

      String str1=mySerial.readString();

     

     

     

    if(str1.indexOf("OK") and c==1)

    {

     

      c=2;

    }

    if(str1.indexOf("NECT")>0 and c==2)

    {

      c=3;

    }

     

     

    if(str1.indexOf("IPD")>0)

    {int temp1=0,temp=0;

      for(int i=str1.indexOf(";");i<str1.length();i++)

      {

        if(str1[i]==',')

        {

          if(temp1!=0)

          {

        

            if(temp==0){

            digitalWrite(temp1,LOW);         

            }

           

            if(temp==1){

            digitalWrite(temp1,HIGH); 

            }

           

          }

          temp1=0;temp=0;

        }

        else if(str1[i]==':')

        {

          temp1=temp;

          temp=0;

        }

        else

        {

          temp=temp*10+(((int)str1[i])-48);

        

        }

       

      }

      c=1;

    }

    if(str1.indexOf("ERROR")>0 or str1.indexOf("is not valid")>0)

    {

      c=1;

      delay(3000);

    }

     

     

    }

     

    }

     

     

     

    :this code run after serail monitor open......if its close then only LED 13 blink ...no data transfer or receive from the esp8266 module

    thanks

Reply
  • 0 in reply to Robert Peter Oakes

    #include <SoftwareSerial.h>

    String str;

    int c=1;

    SoftwareSerial mySerial(10, 11); // RX, TX

    void setup() {

      setpins();

     

    pinMode(13,OUTPUT);

      // set the data rate for the SoftwareSerial port

      mySerial.begin(4800);

     

      wificonnect();

      gotIP();

      delay(3000);

     

     

    }

    void setpins()

    {

      pinMode(1,OUTPUT);

      pinMode(2,OUTPUT);

      pinMode(3,OUTPUT);

      pinMode(4,OUTPUT);

      pinMode(5,OUTPUT);

      pinMode(6,OUTPUT);

      pinMode(7,OUTPUT);

      pinMode(8,OUTPUT);

      pinMode(9,OUTPUT);

    }

    void gotIP()

    {

    if(mySerial.find("GOT IP"))

    {

     

    }else{

      gotIP();

      }

    }

    void wificonnect()

    {

    if(mySerial.find("CONNECTED"))

    {

     

    }

    else{

     

       mySerial.println("AT+CWJAP=\"ganesh\",\"123456789gg\"");

    delay(2000);

    wificonnect();

    }

     

     

    }

     

     

    void loop() { // run over and over

     

     

      delay(1000);

      if(c==1)

      {

       

        mySerial.println("AT+CIPMUX=1");

      }

      if(c==2)

      {

       mySerial.println("AT+CIPSTART=0,\"TCP\",\"GANESH.XP3.BIZ\",80");

      delay(2000);

      }

      if(c==3)

      {

         mySerial.println("AT+CIPSEND=0,50");

    delay(2000);

        mySerial.println("POST /index.php HTTP/1.0");

        mySerial.println("HOST: GANESH.XP3.BIZ");

        mySerial.println();mySerial.println();mySerial.println();mySerial.println();

     

     

      }

     

     

     

    if(mySerial.available())

    {

      String str1=mySerial.readString();

     

     

     

    if(str1.indexOf("OK") and c==1)

    {

     

      c=2;

    }

    if(str1.indexOf("NECT")>0 and c==2)

    {

      c=3;

    }

     

     

    if(str1.indexOf("IPD")>0)

    {int temp1=0,temp=0;

      for(int i=str1.indexOf(";");i<str1.length();i++)

      {

        if(str1[i]==',')

        {

          if(temp1!=0)

          {

        

            if(temp==0){

            digitalWrite(temp1,LOW);         

            }

           

            if(temp==1){

            digitalWrite(temp1,HIGH); 

            }

           

          }

          temp1=0;temp=0;

        }

        else if(str1[i]==':')

        {

          temp1=temp;

          temp=0;

        }

        else

        {

          temp=temp*10+(((int)str1[i])-48);

        

        }

       

      }

      c=1;

    }

    if(str1.indexOf("ERROR")>0 or str1.indexOf("is not valid")>0)

    {

      c=1;

      delay(3000);

    }

     

     

    }

     

    }

     

     

     

    :this code run after serail monitor open......if its close then only LED 13 blink ...no data transfer or receive from the esp8266 module

    thanks

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