How convert hex to ascii in arduino

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i had below Hex value from serial Rx pin.

006900730020006D0065007300730061006700650020007700610073002000730065006E007400200074006F00200079006F0075002000620079002000310030002D0053007400720069006B00650020004E006500740077006F0072006B0020004D006F006E00690074006F007200200066006F007200200074006800650020

How store it in to String variable as ASCII type?

What I have tried:

i tried this way. but not success

C++

loop(){
 String d,full_time ;
  char c ;
  while ( Serial1.available() ) {
    c = Serial1.read();
    d += c;
  }
 
  full_time = (String) strtol( &d[1], NULL, 16);
}

Posted 19-Feb-16 7:24am

Amal anjula

Updated 19-Feb-16 10:31am

Patrice T

v2

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Patrice T 19-Feb-16 14:19pm

This piece of code have nothing to do with hex to ASCII conversion.

Sergey Alexandrovich Kryukov 19-Feb-16 14:46pm

The question, strictly speaking, makes no sense. You are not talking about numbers (a number cannot be hexadecimal or decimal), you are talking about string -> string function, but it can make sense only if you know how to interpret the string. You have the sample, but the sample is not a spec. What is supposed to be interpret as a character? Say, first two characters can be 0x00 and 0x69, or they could be 0x60 and 0x73 (4 characters per number). The problem is very simple, but you are doing it wrong. You should read characters representing one output character by groups, say, of 2 or 4.
—SA

Sergey Alexandrovich Kryukov 19-Feb-16 14:51pm

What is this language? What is String? You have to tag it. Function loop() without return type, even void? += operation for char? But ctrtol line in C/C++? What is it?
—SA

CPallini 19-Feb-16 16:36pm

See here:
https://www.arduino.cc/en/Reference/HomePage

Sergey Alexandrovich Kryukov 19-Feb-16 17:53pm

Thank you, but this page does not tell me what is the language in the samples; it's assumed that the reader knows it. I know that Arduino can be programmed in different languages; and this one looks like C (and at least I can see where is "String") :-)

Still, "loop() {/* ... */}" does not seem to be right syntax which can compile. In a sample, it's just "void loop() {/* ... */}"; and this is what I indicated in my comment:
"Function loop() without return type, even void?"
And still: "d += c;" ?!!!

—SA

CPallini 19-Feb-16 18:09pm

It is 'masked C/C++' a sort of meta-language translated to C/C++. String is an object, += is the 'append operator'.
From the FAQ:
"Can I program the Arduino board in C?"
"In fact, you already are; the Arduino language is merely a set of C/C++ functions that can be called from your code. Your sketch undergoes minor changes (e.g. automatic generation of function prototypes) and then is passed directly to a C/C++ compiler (avr-g++). All standard C and C++ constructs supported by avr-g++ should work in Arduino. For more details, see the page on the Arduino build process."

Sergey Alexandrovich Kryukov 19-Feb-16 18:27pm

All right, thank you again.
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2016-02-19T08:58:00

Please see my comments to the question.

You are doing it wrong. You cannot do d += c;, you have to have a string, or, better, fixed-size array (giving a room for 2 or 4 characters) and fill it with input characters in an inner cycle. On each iteration of inner cycle, parse the string defined by this array (you may need to add closing zero) into a byte value of ASCII code point.

Some uncertainty comes from the fact that it's not known what is your language and what libraries you are using or can use — please see my second comment. :-)
But I hope you can grasp the idea.

—SA

CPallini · Answer 2 · 2016-02-19T10:31:00

Your arduino board is receiveing somthing like:

"is message was sent to you by 10-Strike Network Monitor for the "

probably encode as UTF-16. Since it is just a piece of the message it is difficult to understand the byte order (big or little endian).
Empirically, you may build your string using just the 2^nd,4^th,6^th.. characters, i.e.

loop(){
 String message;
  char c ;
  int count = 0;
  while ( Serial1.available() ) {
    c = Serial1.read();
    if (count % 2) message += c;
    count++;
  } 
}

How convert hex to ascii in arduino

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