Thank you Arrch.

Hello, I’m trying to figure out a few things with Arduino hooked up to Parallax reader but got stuck on some code. Tried to look at Arduino help/reference doesn’t give me much hope. I guess this is completely beginner inexperience not to say lack of knowledge and if anyone can spare a few minutes to clarify that for me, I would be grateful.
What is the difference between the following variable declarations:

First question:

---------------------------------------
String  keyCode;
String  accessList[NumberOfKeys];
char    code[10];
--------------------------------------
I can see two arrays have been allocated but what is basically confusing me is string and char. What is the difference between them?

Second question:
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keyCode = code;
       keyCode = keyCode.substring(0,10);
-------------------------------------
What is happening here, keyCode variable has been assigned code value, why we need the next line of code with keyCode.substring(0,10)?


Thank you very much in advance,
Tom

Hello,

Pretty interesting topic and since I am a complete beginner in programming, got stuck understanding your code as follows:

1.   Why this line is necessary, some kind of data conversion?
keyCode = keyCode.substring(0,10);

2.   What will happen here, if the  first if statement is correct, the code will execute and else statement will be skipped, am I right?  Actually what is the purpose of the first statement.

if((keyCode == Master) && (programmingMode == false))
       {programmingMode = true;
        digitalWrite(PROGRAMMING_LIGHT,HIGH);
      }
       else
       {if(programmingMode == false)


Thanks in advace, Tom